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Merge pull request #5991 from gilles-peskine-arm/asn1write-0-fix-2.28

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Backport 2.28: Improve ASN.1 write tests
This commit is contained in:
Ronald Cron
2022-06-30 15:42:31 +02:00
committed by GitHub
parent eee5c8ac23 d97de551e4
commit 0ae1c1c49c
4 changed files with 183 additions and 23 deletions
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library/asn1write.c
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@ -133,6 +133,11 @@ int mbedtls_asn1_write_mpi( unsigned char **p, unsigned char *start, const mbedt
//
len = mbedtls_mpi_size( X );
/* DER represents 0 with a sign bit (0=nonnegative) and 7 value bits, not
* as 0 digits. We need to end up with 020100, not with 0200. */
if( len == 0 )
len = 1;
if( *p < start || (size_t)( *p - start ) < len )
return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );