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Fix issue #2718 (condition always false)

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This commit is contained in:
irwir 2019-09-21 18:51:25 +03:00
parent c835672c51
commit 6527bd6dfc
3 changed files with 10 additions and 4 deletions
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6
ChangeLog
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@ -1,5 +1,11 @@
mbed TLS ChangeLog (Sorted per branch, date) mbed TLS ChangeLog (Sorted per branch, date)
= mbed TLS 2.19.2 branch released xxxx-xx-xx
Bugfix
* Remove a spurious check in ssl_parse_client_psk_identity that triggered
a warning with some compilers. Fix contributed by irwir in #2856.
= mbed TLS 2.19.1 branch released 2019-09-16 = mbed TLS 2.19.1 branch released 2019-09-16
Features Features

4
library/ssl_cli.c
View file

@ -2339,7 +2339,7 @@ static int ssl_parse_server_psk_hint( mbedtls_ssl_context *ssl,
unsigned char *end ) unsigned char *end )
{ {
int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
size_t len; uint16_t len;
((void) ssl); ((void) ssl);
/* /*
@ -2356,7 +2356,7 @@ static int ssl_parse_server_psk_hint( mbedtls_ssl_context *ssl,
len = (*p)[0] << 8 | (*p)[1]; len = (*p)[0] << 8 | (*p)[1];
*p += 2; *p += 2;
if( end - (*p) < (int) len ) if( end - (*p) < len )
{ {
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message " MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message "
"(psk_identity_hint length)" ) ); "(psk_identity_hint length)" ) );

4
library/ssl_srv.c
View file

@ -3810,7 +3810,7 @@ static int ssl_parse_client_psk_identity( mbedtls_ssl_context *ssl, unsigned cha
const unsigned char *end ) const unsigned char *end )
{ {
int ret = 0; int ret = 0;
size_t n; uint16_t n;
if( ssl_conf_has_psk_or_cb( ssl->conf ) == 0 ) if( ssl_conf_has_psk_or_cb( ssl->conf ) == 0 )
{ {
@ -3830,7 +3830,7 @@ static int ssl_parse_client_psk_identity( mbedtls_ssl_context *ssl, unsigned cha
n = ( (*p)[0] << 8 ) | (*p)[1]; n = ( (*p)[0] << 8 ) | (*p)[1];
*p += 2; *p += 2;
if( n < 1 || n > 65535 || n > (size_t) ( end - *p ) ) if( n == 0 || n > end - *p )
{ {
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );