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ENGINE_pkey_asn1_find_str(): don't assume an engine implements ASN1 method 

Just because an engine implements algorithm methods, that doesn't mean
it also implements the ASN1 method.  Therefore, be careful when looking
for an ASN1 method among all engines, don't try to use one that doesn't
exist.

Fixes #6381

Reviewed-by: Tim Hudson <tjh@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6383)
This commit is contained in:
Richard Levitte 2018-05-31 11:12:34 +02:00
parent af21f71e7c
commit 1ac3cd6277
1 changed files with 1 additions and 1 deletions
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2
crypto/engine/tb_asnmth.c
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@ -215,7 +215,7 @@ static void look_str_cb(int nid, STACK_OF(ENGINE) *sk, ENGINE *def, void *arg)
ENGINE *e = sk_ENGINE_value(sk, i);
EVP_PKEY_ASN1_METHOD *ameth;
e->pkey_asn1_meths(e, &ameth, NULL, nid);
if (((int)strlen(ameth->pem_str) == lk->len) &&
if (ameth != NULL && ((int)strlen(ameth->pem_str) == lk->len) &&
!strncasecmp(ameth->pem_str, lk->str, lk->len)) {
lk->e = e;
lk->ameth = ameth;