Merge pull request #265 from ARMmbed/iotssl-460-bugfixes

Iotssl 460 bugfixes

CMakeLists.txt

@@ -29,6 +29,9 @@ if(CMAKE_COMPILER_IS_GNUCC)
     if (GCC_VERSION VERSION_GREATER 4.5 OR GCC_VERSION VERSION_EQUAL 4.5)
         set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wlogical-op")
     endif()
+    if (GCC_VERSION VERSION_GREATER 4.8 OR GCC_VERSION VERSION_EQUAL 4.8)
+        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wshadow")
+    endif()
     set(CMAKE_C_FLAGS_RELEASE     "-O2")
     set(CMAKE_C_FLAGS_DEBUG       "-O0 -g3")
     set(CMAKE_C_FLAGS_COVERAGE    "-O0 -g3 --coverage")
@@ -39,7 +42,7 @@ if(CMAKE_COMPILER_IS_GNUCC)
 endif(CMAKE_COMPILER_IS_GNUCC)
 
 if(CMAKE_COMPILER_IS_CLANG)
-    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -W -Wdeclaration-after-statement -Wwrite-strings -Wpointer-arith -Wimplicit-fallthrough")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -W -Wdeclaration-after-statement -Wwrite-strings -Wpointer-arith -Wimplicit-fallthrough -Wshadow")
     set(CMAKE_C_FLAGS_RELEASE     "-O2")
     set(CMAKE_C_FLAGS_DEBUG       "-O0 -g3")
     set(CMAKE_C_FLAGS_COVERAGE    "-O0 -g3 --coverage")

ChangeLog

@@ -29,6 +29,13 @@ Bugfix
    * Fix bug in mbedtls_rsa_public() and mbedtls_rsa_private() that could
      result trying to unlock an unlocked mutex on invalid input (found by
      Fredrik Axelsson) (#257)
+   * Fix -Wshadow warnings (found by hnrkp) (#240)
+   * Fix memory corruption on client with overlong PSK identity, around
+     SSL_MAX_CONTENT_LEN or higher - not triggerrable remotely (found by
+     Aleksandrs Saveljevs) (#238)
+   * Fix unused function warning when using MBEDTLS_MDx_ALT or
+     MBEDTLS_SHAxxx_ALT (found by Henrik) (#239)
+   * Fix memory corruption in pkey programs (found by yankuncheng) (#210)
 
 Changes
    * The PEM parser now accepts a trailing space at end of lines (#226).

library/entropy_poll.c

@@ -140,7 +140,7 @@ int mbedtls_platform_entropy_poll( void *data,
                            unsigned char *output, size_t len, size_t *olen )
 {
     FILE *file;
-    size_t ret;
+    size_t read_len;
     ((void) data);
 
 #if defined(HAVE_GETRANDOM)
@@ -165,8 +165,8 @@ int mbedtls_platform_entropy_poll( void *data,
     if( file == NULL )
         return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
 
-    ret = fread( output, 1, len, file );
+    read_len = fread( output, 1, len, file );
-    if( ret != len )
+    if( read_len != len )
     {
         fclose( file );
         return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );

library/md2.c

@@ -47,13 +47,13 @@
 #endif /* MBEDTLS_PLATFORM_C */
 #endif /* MBEDTLS_SELF_TEST */
 
+#if !defined(MBEDTLS_MD2_ALT)
+
 /* Implementation that should never be optimized out by the compiler */
 static void mbedtls_zeroize( void *v, size_t n ) {
     volatile unsigned char *p = v; while( n-- ) *p++ = 0;
 }
 
-#if !defined(MBEDTLS_MD2_ALT)
-
 static const unsigned char PI_SUBST[256] =
 {
     0x29, 0x2E, 0x43, 0xC9, 0xA2, 0xD8, 0x7C, 0x01, 0x3D, 0x36,

library/md4.c

@@ -47,13 +47,13 @@
 #endif /* MBEDTLS_PLATFORM_C */
 #endif /* MBEDTLS_SELF_TEST */
 
+#if !defined(MBEDTLS_MD4_ALT)
+
 /* Implementation that should never be optimized out by the compiler */
 static void mbedtls_zeroize( void *v, size_t n ) {
     volatile unsigned char *p = v; while( n-- ) *p++ = 0;
 }
 
-#if !defined(MBEDTLS_MD4_ALT)
-
 /*
  * 32-bit integer manipulation macros (little endian)
  */

library/md5.c

@@ -46,13 +46,13 @@
 #endif /* MBEDTLS_PLATFORM_C */
 #endif /* MBEDTLS_SELF_TEST */
 
+#if !defined(MBEDTLS_MD5_ALT)
+
 /* Implementation that should never be optimized out by the compiler */
 static void mbedtls_zeroize( void *v, size_t n ) {
     volatile unsigned char *p = v; while( n-- ) *p++ = 0;
 }
 
-#if !defined(MBEDTLS_MD5_ALT)
-
 /*
  * 32-bit integer manipulation macros (little endian)
  */

library/sha1.c

@@ -46,13 +46,13 @@
 #endif /* MBEDTLS_PLATFORM_C */
 #endif /* MBEDTLS_SELF_TEST */
 
+#if !defined(MBEDTLS_SHA1_ALT)
+
 /* Implementation that should never be optimized out by the compiler */
 static void mbedtls_zeroize( void *v, size_t n ) {
     volatile unsigned char *p = v; while( n-- ) *p++ = 0;
 }
 
-#if !defined(MBEDTLS_SHA1_ALT)
-
 /*
  * 32-bit integer manipulation macros (big endian)
  */

library/sha256.c

@@ -46,13 +46,13 @@
 #endif /* MBEDTLS_PLATFORM_C */
 #endif /* MBEDTLS_SELF_TEST */
 
+#if !defined(MBEDTLS_SHA256_ALT)
+
 /* Implementation that should never be optimized out by the compiler */
 static void mbedtls_zeroize( void *v, size_t n ) {
     volatile unsigned char *p = v; while( n-- ) *p++ = 0;
 }
 
-#if !defined(MBEDTLS_SHA256_ALT)
-
 /*
  * 32-bit integer manipulation macros (big endian)
  */

library/sha512.c

@@ -52,13 +52,13 @@
 #endif /* MBEDTLS_PLATFORM_C */
 #endif /* MBEDTLS_SELF_TEST */
 
+#if !defined(MBEDTLS_SHA512_ALT)
+
 /* Implementation that should never be optimized out by the compiler */
 static void mbedtls_zeroize( void *v, size_t n ) {
     volatile unsigned char *p = v; while( n-- ) *p++ = 0;
 }
 
-#if !defined(MBEDTLS_SHA512_ALT)
-
 /*
  * 64-bit integer manipulation macros (big endian)
  */

library/ssl_cli.c

@@ -1748,6 +1748,12 @@ static int ssl_write_encrypted_pms( mbedtls_ssl_context *ssl,
     size_t len_bytes = ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ? 0 : 2;
     unsigned char *p = ssl->handshake->premaster + pms_offset;
 
+    if( offset + len_bytes > MBEDTLS_SSL_MAX_CONTENT_LEN )
+    {
+        MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small for encrypted pms" ) );
+        return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
+    }
+
     /*
      * Generate (part of) the pre-master as
      *  struct {
@@ -2522,6 +2528,14 @@ static int ssl_write_client_key_exchange( mbedtls_ssl_context *ssl )
 
         i = 4;
         n = ssl->conf->psk_identity_len;
+
+        if( i + 2 + n > MBEDTLS_SSL_MAX_CONTENT_LEN )
+        {
+            MBEDTLS_SSL_DEBUG_MSG( 1, ( "psk identity too long or "
+                                        "SSL buffer too short" ) );
+            return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
+        }
+
         ssl->out_msg[i++] = (unsigned char)( n >> 8 );
         ssl->out_msg[i++] = (unsigned char)( n      );
 
@@ -2550,6 +2564,14 @@ static int ssl_write_client_key_exchange( mbedtls_ssl_context *ssl )
              * ClientDiffieHellmanPublic public (DHM send G^X mod P)
              */
             n = ssl->handshake->dhm_ctx.len;
+
+            if( i + 2 + n > MBEDTLS_SSL_MAX_CONTENT_LEN )
+            {
+                MBEDTLS_SSL_DEBUG_MSG( 1, ( "psk identity or DHM size too long"
+                                            " or SSL buffer too short" ) );
+                return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
+            }
+
             ssl->out_msg[i++] = (unsigned char)( n >> 8 );
             ssl->out_msg[i++] = (unsigned char)( n      );
 

library/ssl_tls.c

@@ -694,8 +694,6 @@ int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
     }
     else
     {
-        int ret;
-
         /* Initialize HMAC contexts */
         if( ( ret = mbedtls_md_setup( &transform->md_ctx_enc, md_info, 1 ) ) != 0 ||
             ( ret = mbedtls_md_setup( &transform->md_ctx_dec, md_info, 1 ) ) != 0 )
@@ -1455,7 +1453,7 @@ static int ssl_encrypt_buf( mbedtls_ssl_context *ssl )
             /*
              * Generate IV
              */
-            int ret = ssl->conf->f_rng( ssl->conf->p_rng, ssl->transform_out->iv_enc,
+            ret = ssl->conf->f_rng( ssl->conf->p_rng, ssl->transform_out->iv_enc,
                                   ssl->transform_out->ivlen );
             if( ret != 0 )
                 return( ret );
@@ -5462,6 +5460,13 @@ int mbedtls_ssl_conf_psk( mbedtls_ssl_config *conf,
     if( psk_len > MBEDTLS_PSK_MAX_LEN )
         return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
 
+    /* Identity len will be encoded on two bytes */
+    if( ( psk_identity_len >> 16 ) != 0 ||
+        psk_identity_len > MBEDTLS_SSL_MAX_CONTENT_LEN )
+    {
+        return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+    }
+
     if( conf->psk != NULL || conf->psk_identity != NULL )
     {
         mbedtls_free( conf->psk );

programs/pkey/dh_client.c

@@ -75,7 +75,7 @@ int main( void )
 
     unsigned char *p, *end;
     unsigned char buf[2048];
-    unsigned char hash[20];
+    unsigned char hash[32];
     const char *pers = "dh_client";
 
     mbedtls_entropy_context entropy;

programs/pkey/dh_server.c

@@ -74,7 +74,7 @@ int main( void )
     mbedtls_net_context listen_fd, client_fd;
 
     unsigned char buf[2048];
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf2[2];
     const char *pers = "dh_server";
 

programs/pkey/pk_decrypt.c

@@ -151,8 +151,11 @@ exit:
     mbedtls_entropy_free( &entropy );
 
 #if defined(MBEDTLS_ERROR_C)
+    if( ret != 0 )
+    {
         mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
         mbedtls_printf( "  !  Last error was: %s\n", buf );
+    }
 #endif
 
 #if defined(_WIN32)

programs/pkey/pk_encrypt.c

@@ -151,8 +151,11 @@ exit:
     mbedtls_entropy_free( &entropy );
 
 #if defined(MBEDTLS_ERROR_C)
+    if( ret != 0 )
+    {
         mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
         mbedtls_printf( "  !  Last error was: %s\n", buf );
+    }
 #endif
 
 #if defined(_WIN32)

programs/pkey/pk_sign.c

@@ -64,7 +64,7 @@ int main( int argc, char *argv[] )
     mbedtls_pk_context pk;
     mbedtls_entropy_context entropy;
     mbedtls_ctr_drbg_context ctr_drbg;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
     char filename[512];
     const char *pers = "mbedtls_pk_sign";
@@ -129,7 +129,7 @@ int main( int argc, char *argv[] )
     }
 
     /*
-     * Write the signature into <filename>-sig.txt
+     * Write the signature into <filename>.sig
      */
     mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[2] );
 
@@ -156,8 +156,11 @@ exit:
     mbedtls_entropy_free( &entropy );
 
 #if defined(MBEDTLS_ERROR_C)
+    if( ret != 0 )
+    {
         mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
         mbedtls_printf( "  !  Last error was: %s\n", buf );
+    }
 #endif
 
 #if defined(_WIN32)

programs/pkey/pk_verify.c

@@ -59,7 +59,7 @@ int main( int argc, char *argv[] )
     int ret = 1;
     size_t i;
     mbedtls_pk_context pk;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
     char filename[512];
 
@@ -86,7 +86,7 @@ int main( int argc, char *argv[] )
     }
 
     /*
-     * Extract the signature from the text file
+     * Extract the signature from the file
      */
     ret = 1;
     mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[2] );
@@ -103,8 +103,8 @@ int main( int argc, char *argv[] )
     fclose( f );
 
     /*
-     * Compute the SHA-256 hash of the input file and compare
+     * Compute the SHA-256 hash of the input file and
-     * it with the hash decrypted from the signature.
+     * verify the signature
      */
     mbedtls_printf( "\n  . Verifying the SHA-256 signature" );
     fflush( stdout );
@@ -124,7 +124,7 @@ int main( int argc, char *argv[] )
         goto exit;
     }
 
-    mbedtls_printf( "\n  . OK (the decrypted SHA-256 hash matches)\n\n" );
+    mbedtls_printf( "\n  . OK (the signature is valid)\n\n" );
 
     ret = 0;
 
@@ -132,8 +132,11 @@ exit:
     mbedtls_pk_free( &pk );
 
 #if defined(MBEDTLS_ERROR_C)
+    if( ret != 0 )
+    {
         mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
         mbedtls_printf( "  !  Last error was: %s\n", buf );
+    }
 #endif
 
 #if defined(_WIN32)

programs/pkey/rsa_genkey.c

@@ -46,7 +46,7 @@
 #include <string.h>
 #endif
 
-#define KEY_SIZE 1024
+#define KEY_SIZE 2048
 #define EXPONENT 65537
 
 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) ||   \

programs/pkey/rsa_sign.c

@@ -32,6 +32,7 @@
 #include <stdio.h>
 #define mbedtls_fprintf    fprintf
 #define mbedtls_printf     printf
+#define mbedtls_snprintf   snprintf
 #endif
 
 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) ||  \
@@ -58,8 +59,9 @@ int main( int argc, char *argv[] )
     int ret;
     size_t i;
     mbedtls_rsa_context rsa;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
+    char filename[512];
 
     ret = 1;
 
@@ -135,11 +137,11 @@ int main( int argc, char *argv[] )
     }
 
     /*
-     * Write the signature into <filename>-sig.txt
+     * Write the signature into <filename>.sig
      */
-    memcpy( argv[1] + strlen( argv[1] ), ".sig", 5 );
+    mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[1] );
 
-    if( ( f = fopen( argv[1], "wb+" ) ) == NULL )
+    if( ( f = fopen( filename, "wb+" ) ) == NULL )
     {
         ret = 1;
         mbedtls_printf( " failed\n  ! Could not create %s\n\n", argv[1] );
@@ -152,7 +154,7 @@ int main( int argc, char *argv[] )
 
     fclose( f );
 
-    mbedtls_printf( "\n  . Done (created \"%s\")\n\n", argv[1] );
+    mbedtls_printf( "\n  . Done (created \"%s\")\n\n", filename );
 
 exit:
 

programs/pkey/rsa_sign_pss.c

@@ -65,7 +65,7 @@ int main( int argc, char *argv[] )
     mbedtls_pk_context pk;
     mbedtls_entropy_context entropy;
     mbedtls_ctr_drbg_context ctr_drbg;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
     char filename[512];
     const char *pers = "rsa_sign_pss";
@@ -140,7 +140,7 @@ int main( int argc, char *argv[] )
     }
 
     /*
-     * Write the signature into <filename>-sig.txt
+     * Write the signature into <filename>.sig
      */
     mbedtls_snprintf( filename, 512, "%s.sig", argv[2] );
 

programs/pkey/rsa_verify.c

@@ -31,6 +31,7 @@
 #else
 #include <stdio.h>
 #define mbedtls_printf     printf
+#define mbedtls_snprintf   snprintf
 #endif
 
 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) ||  \
@@ -57,8 +58,9 @@ int main( int argc, char *argv[] )
     int ret, c;
     size_t i;
     mbedtls_rsa_context rsa;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
+    char filename[512];
 
     ret = 1;
     if( argc != 2 )
@@ -99,17 +101,15 @@ int main( int argc, char *argv[] )
      * Extract the RSA signature from the text file
      */
     ret = 1;
-    i = strlen( argv[1] );
+    mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[1] );
-    memcpy( argv[1] + i, ".sig", 5 );
 
-    if( ( f = fopen( argv[1], "rb" ) ) == NULL )
+    if( ( f = fopen( filename, "rb" ) ) == NULL )
     {
-        mbedtls_printf( "\n  ! Could not open %s\n\n", argv[1] );
+        mbedtls_printf( "\n  ! Could not open %s\n\n", filename );
         goto exit;
     }
 
-    argv[1][i] = '\0', i = 0;
+    i = 0;
-
     while( fscanf( f, "%02X", &c ) > 0 &&
            i < (int) sizeof( buf ) )
         buf[i++] = (unsigned char) c;
@@ -123,8 +123,8 @@ int main( int argc, char *argv[] )
     }
 
     /*
-     * Compute the SHA-256 hash of the input file and compare
+     * Compute the SHA-256 hash of the input file and
-     * it with the hash decrypted from the RSA signature.
+     * verify the signature
      */
     mbedtls_printf( "\n  . Verifying the RSA/SHA-256 signature" );
     fflush( stdout );
@@ -144,7 +144,7 @@ int main( int argc, char *argv[] )
         goto exit;
     }
 
-    mbedtls_printf( "\n  . OK (the decrypted SHA-256 hash matches)\n\n" );
+    mbedtls_printf( "\n  . OK (the signature is valid)\n\n" );
 
     ret = 0;
 

programs/pkey/rsa_verify_pss.c

@@ -63,7 +63,7 @@ int main( int argc, char *argv[] )
     int ret = 1;
     size_t i;
     mbedtls_pk_context pk;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
     char filename[512];
 
@@ -100,7 +100,7 @@ int main( int argc, char *argv[] )
     mbedtls_rsa_set_padding( mbedtls_pk_rsa( pk ), MBEDTLS_RSA_PKCS_V21, MBEDTLS_MD_SHA256 );
 
     /*
-     * Extract the RSA signature from the text file
+     * Extract the RSA signature from the file
      */
     ret = 1;
     mbedtls_snprintf( filename, 512, "%s.sig", argv[2] );
@@ -117,8 +117,8 @@ int main( int argc, char *argv[] )
     fclose( f );
 
     /*
-     * Compute the SHA-256 hash of the input file and compare
+     * Compute the SHA-256 hash of the input file and
-     * it with the hash decrypted from the RSA signature.
+     * verify the signature
      */
     mbedtls_printf( "\n  . Verifying the RSA/SHA-256 signature" );
     fflush( stdout );
@@ -138,7 +138,7 @@ int main( int argc, char *argv[] )
         goto exit;
     }
 
-    mbedtls_printf( "\n  . OK (the decrypted SHA-256 hash matches)\n\n" );
+    mbedtls_printf( "\n  . OK (the signature is valid)\n\n" );
 
     ret = 0;
 

programs/ssl/ssl_server2.c

@@ -1925,7 +1925,7 @@ reset:
         if( ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED )
         {
             char vrfy_buf[512];
-            uint32_t flags = mbedtls_ssl_get_verify_result( &ssl );
+            flags = mbedtls_ssl_get_verify_result( &ssl );
 
             mbedtls_x509_crt_verify_info( vrfy_buf, sizeof( vrfy_buf ), "  ! ", flags );
 

programs/test/benchmark.c

@@ -108,26 +108,26 @@ int main( void )
 
 #define TIME_AND_TSC( TITLE, CODE )                                     \
 do {                                                                    \
-    unsigned long i, j, tsc;                                            \
+    unsigned long ii, jj, tsc;                                          \
                                                                         \
     mbedtls_printf( HEADER_FORMAT, TITLE );                             \
     fflush( stdout );                                                   \
                                                                         \
     mbedtls_set_alarm( 1 );                                             \
-    for( i = 1; ! mbedtls_timing_alarmed; i++ )                                        \
+    for( ii = 1; ! mbedtls_timing_alarmed; ii++ )                       \
     {                                                                   \
         CODE;                                                           \
     }                                                                   \
                                                                         \
     tsc = mbedtls_timing_hardclock();                                   \
-    for( j = 0; j < 1024; j++ )                                         \
+    for( jj = 0; jj < 1024; jj++ )                                      \
     {                                                                   \
         CODE;                                                           \
     }                                                                   \
                                                                         \
     mbedtls_printf( "%9lu Kb/s,  %9lu cycles/byte\n",                   \
-                     i * BUFSIZE / 1024,                                \
+                     ii * BUFSIZE / 1024,                               \
-                     ( mbedtls_timing_hardclock() - tsc ) / ( j * BUFSIZE ) );         \
+                     ( mbedtls_timing_hardclock() - tsc ) / ( jj * BUFSIZE ) );         \
 } while( 0 )
 
 #if defined(MBEDTLS_ERROR_C)
@@ -149,7 +149,7 @@ do {                                                                    \
 
 #define MEMORY_MEASURE_PRINT( title_len )                               \
     mbedtls_memory_buffer_alloc_max_get( &max_used, &max_blocks );      \
-    for( i = 12 - title_len; i != 0; i-- ) mbedtls_printf( " " );      \
+    for( ii = 12 - title_len; ii != 0; ii-- ) mbedtls_printf( " " );    \
     max_used -= prv_used;                                               \
     max_blocks -= prv_blocks;                                           \
     max_bytes = max_used + MEM_BLOCK_OVERHEAD * max_blocks;             \
@@ -162,7 +162,7 @@ do {                                                                    \
 
 #define TIME_PUBLIC( TITLE, TYPE, CODE )                                \
 do {                                                                    \
-    unsigned long i;                                                    \
+    unsigned long ii;                                                   \
     int ret;                                                            \
     MEMORY_MEASURE_INIT;                                                \
                                                                         \
@@ -171,7 +171,7 @@ do {                                                                    \
     mbedtls_set_alarm( 3 );                                             \
                                                                         \
     ret = 0;                                                            \
-    for( i = 1; ! mbedtls_timing_alarmed && ! ret ; i++ )                              \
+    for( ii = 1; ! mbedtls_timing_alarmed && ! ret ; ii++ )             \
     {                                                                   \
         CODE;                                                           \
     }                                                                   \
@@ -182,7 +182,7 @@ do {                                                                    \
     }                                                                   \
     else                                                                \
     {                                                                   \
-        mbedtls_printf( "%6lu " TYPE "/s", i / 3 );                    \
+        mbedtls_printf( "%6lu " TYPE "/s", ii / 3 );                    \
         MEMORY_MEASURE_PRINT( sizeof( TYPE ) + 1 );                     \
         mbedtls_printf( "\n" );                                         \
     }                                                                   \

programs/test/udp_proxy.c

@@ -389,7 +389,7 @@ void update_dropped( const packet *p )
 
     while( cur < end )
     {
-        size_t len = ( ( cur[11] << 8 ) | cur[12] ) + 13;
+        len = ( ( cur[11] << 8 ) | cur[12] ) + 13;
 
         id = len % sizeof( dropped );
         ++dropped[id];