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ECP: Add return code checking in mbedtls_ecp_ansi_write_group

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Add a check for the return value of mbedtls_asn1_write_oid
This commit is contained in:
Andrzej Kurek 2018-02-21 05:19:33 -05:00
parent 57b3ccb4fa
commit 486ec972cb
1 changed files with 3 additions and 1 deletions
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4
library/ecp.c
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@ -2074,6 +2074,7 @@ int mbedtls_ecp_ansi_write_group( const mbedtls_ecp_group *grp,
size_t oid_length;
int ret;
*olen = 0;
ret = mbedtls_oid_get_oid_by_ec_grp( grp->id, &oid, &oid_length );
if( ret != 0 )
return( ret );
@ -2081,7 +2082,8 @@ int mbedtls_ecp_ansi_write_group( const mbedtls_ecp_group *grp,
if( size < 2 + oid_length )
return( MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL );
q = p + 2 + oid_length;
*olen = mbedtls_asn1_write_oid( &q, p, oid, oid_length );
MBEDTLS_ASN1_CHK_ADD( *olen, mbedtls_asn1_write_oid( &q, p, oid,
oid_length ) );
if ( p != q )
return ( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
return ( 0 );