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Fix other occurrences of same bounds check issue

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Security impact is the same: not triggerrable remotely except in very specific
use cases

backport of 4dc9b39
This commit is contained in:
Manuel Pégourié-Gonnard 2015-10-21 12:23:09 +02:00
parent 758f490c90
commit 8abc22dde5
2 changed files with 5 additions and 2 deletions
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2
library/pkwrite.c
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@ -97,7 +97,7 @@ static int pk_write_ec_pubkey( unsigned char **p, unsigned char *start,
return( ret ); return( ret );
} }
if( *p - start < (int) len ) if( *p < start || (size_t)( *p - start ) < len )
return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL ); return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );
*p -= len; *p -= len;

5
library/x509_create.c
View file

@ -265,13 +265,16 @@ int x509_write_sig( unsigned char **p, unsigned char *start,
int ret; int ret;
size_t len = 0; size_t len = 0;
if( *p - start < (int) size + 1 ) if( *p < start || (size_t)( *p - start ) < size )
return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL ); return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );
len = size; len = size;
(*p) -= len; (*p) -= len;
memcpy( *p, sig, len ); memcpy( *p, sig, len );
if( *p - start < 1 )
return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );
*--(*p) = 0; *--(*p) = 0;
len += 1; len += 1;