X.509: fix comparisons of ->pkey_algo

->pkey_algo used to be an enum, but was changed to a string by commit
4e8ae72a75aa ("X.509: Make algo identifiers text instead of enum").  But
two comparisons were not updated.  Fix them to use strcmp().

This bug broke signature verification in certain configurations,
depending on whether the string constants were deduplicated or not.

Fixes: 4e8ae72a75aa ("X.509: Make algo identifiers text instead of enum")
Cc: <stable@vger.kernel.org> # v4.6+
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: David Howells <dhowells@redhat.com>

2 files changed, 2 insertions, 2 deletions

diff --git a/crypto/asymmetric_keys/pkcs7_verify.c b/crypto/asymmetric_keys/pkcs7_verify.c
index 255e84abdc69..39e6de0c2761 100644
--- a/crypto/asymmetric_keys/pkcs7_verify.c
+++ b/crypto/asymmetric_keys/pkcs7_verify.c
@@ -147,7 +147,7 @@ static int pkcs7_find_key(struct pkcs7_message *pkcs7,
                 pr_devel("Sig %u: Found cert serial match X.509[%u]\n",
                          sinfo->index, certix);
 
-                if (x509->pub->pkey_algo != sinfo->sig->pkey_algo) {
+                if (strcmp(x509->pub->pkey_algo, sinfo->sig->pkey_algo) != 0) {
                         pr_warn("Sig %u: X.509 algo and PKCS#7 sig algo don't match\n",
                                 sinfo->index);
                         continue;
diff --git a/crypto/asymmetric_keys/x509_public_key.c b/crypto/asymmetric_keys/x509_public_key.c
index e67fd29fbd11..9338b4558cdc 100644
--- a/crypto/asymmetric_keys/x509_public_key.c
+++ b/crypto/asymmetric_keys/x509_public_key.c
@@ -131,7 +131,7 @@ int x509_check_for_self_signed(struct x509_certificate *cert)
         }
 
         ret = -EKEYREJECTED;
-        if (cert->pub->pkey_algo != cert->sig->pkey_algo)
+        if (strcmp(cert->pub->pkey_algo, cert->sig->pkey_algo) != 0)
                 goto out;
 
         ret = public_key_verify_signature(cert->pub, cert->sig);