[PATCH] X.509: Fix error code in x509_cert_parse()

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

We forgot to set the error code on this path so it could result in
returning NULL which leads to a NULL dereference.

Fixes: db6c43bd2132 ("crypto: KEYS: convert public key and digsig asym to the akcipher api")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

diff --git a/crypto/asymmetric_keys/x509_cert_parser.c b/crypto/asymmetric_keys/x509_cert_parser.c
index c80765b211cf..1f69e948fb34 100644
--- a/crypto/asymmetric_keys/x509_cert_parser.c
+++ b/crypto/asymmetric_keys/x509_cert_parser.c
@@ -103,8 +103,10 @@ struct x509_certificate *x509_cert_parse(const void *data, size_t datalen)
 	}
 
 	cert->pub->key = kmemdup(ctx->key, ctx->key_size, GFP_KERNEL);
-	if (!cert->pub->key)
+	if (!cert->pub->key) {
+		ret = -ENOMEM;
 		goto error_decode;
+	}
 
 	cert->pub->keylen = ctx->key_size;