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Fix 1 byte overread in mbedtls_asn1_get_int()

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Andres AG 2016-09-26 09:52:41 +01:00 committed by Simon Butcher
parent 865c899681
commit fbd1cd9d57
2 changed files with 3 additions and 1 deletions
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2
ChangeLog
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@ -12,6 +12,8 @@ Bugfix
enabled unless others were also present. Found by David Fernandez. #428 enabled unless others were also present. Found by David Fernandez. #428
* Fixed cert_app sample program for debug output and for use when no root * Fixed cert_app sample program for debug output and for use when no root
certificates are provided. certificates are provided.
* Fix conditional statement that would cause a 1 byte overread in
mbedtls_asn1_get_int(). Found and fixed by Guido Vranken.
* Fixed the sample applications gen_key.c, cert_req.c and cert_write.c for * Fixed the sample applications gen_key.c, cert_req.c and cert_write.c for
builds where the configuration MBEDTLS_PEM_WRITE_C is not defined. Found builds where the configuration MBEDTLS_PEM_WRITE_C is not defined. Found
by inestlerode. #559. by inestlerode. #559.

2
library/asn1parse.c
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@ -153,7 +153,7 @@ int mbedtls_asn1_get_int( unsigned char **p,
if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 ) if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
return( ret ); return( ret );
if( len > sizeof( int ) || ( **p & 0x80 ) != 0 ) if( len == 0 || len > sizeof( int ) || ( **p & 0x80 ) != 0 )
return( MBEDTLS_ERR_ASN1_INVALID_LENGTH ); return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
*val = 0; *val = 0;