Fix BIO_f_asn1() to properly report some errors
Some things that may go wrong in asn1_bio_write() are serious errors
that should be reported as -1, rather than 0 (which just means "we wrote
no data").
@@ -172,7 +172,7 @@ static int asn1_bio_write(BIO *b, const char *in, int inl)
case ASN1_STATE_START:
if (!asn1_bio_setup_ex(b, ctx, ctx->prefix,
ASN1_STATE_PRE_COPY, ASN1_STATE_HEADER))
- return 0;
+ return -1;
break;
/* Copy any pre data first */
@@ -189,7 +189,7 @@ static int asn1_bio_write(BIO *b, const char *in, int inl)
case ASN1_STATE_HEADER:
ctx->buflen = ASN1_object_size(0, inl, ctx->asn1_tag) - inl;
if (!ossl_assert(ctx->buflen <= ctx->bufsize))
- return 0;
+ return -1;
p = ctx->buf;
ASN1_put_object(&p, 0, inl, ctx->asn1_tag, ctx->asn1_class);
ctx->copylen = inl;
