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mbedtls_asn1_get_bitstring_null: fix rejection of short inputs
Fix improper rejection of bitstrings with length less than 2.
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@ -230,8 +230,13 @@ int mbedtls_asn1_get_bitstring_null( unsigned char **p, const unsigned char *end
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if( ( ret = mbedtls_asn1_get_tag( p, end, len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
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return( ret );
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if( (*len)-- < 2 || *(*p)++ != 0 )
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if( *len == 0 )
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return( MBEDTLS_ERR_ASN1_INVALID_DATA );
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--( *len );
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if( **p != 0 )
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return( MBEDTLS_ERR_ASN1_INVALID_DATA );
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++( *p );
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return( 0 );
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}
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