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

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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)

(cherry picked from commit 1ac3cd6277)
This commit is contained in:
Richard Levitte 2018-05-31 11:12:34 +02:00
parent 7e2e10aaec
commit 13b578ada3
1 changed files with 2 additions and 1 deletions
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3
crypto/engine/tb_asnmth.c
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@ -170,7 +170,8 @@ 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) == 0) {
lk->e = e;
lk->ameth = ameth;