crypto: algif - return error code when no data was processed

If no data has been processed during recvmsg, return the error code.
This covers all errors received during non-AIO operations.

If any error occurs during a synchronous operation in addition to
-EIOCBQUEUED or -EBADMSG (like -ENOMEM), it should be relayed to the
caller.
Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/algif_aead.c

@@ -791,9 +791,11 @@ static int aead_recvmsg(struct socket *sock, struct msghdr *msg,
 		 * only handle one AIO request. If the caller wants to have
 		 * multiple AIO requests in parallel, he must make multiple
 		 * separate AIO calls.
+		 *
+		 * Also return the error if no data has been processed so far.
 		 */
 		if (err <= 0) {
-			if (err == -EIOCBQUEUED || err == -EBADMSG)
+			if (err == -EIOCBQUEUED || err == -EBADMSG || !ret)
 				ret = err;
 			goto out;
 		}

crypto/algif_skcipher.c

@@ -714,9 +714,11 @@ static int skcipher_recvmsg(struct socket *sock, struct msghdr *msg,
 		 * only handle one AIO request. If the caller wants to have
 		 * multiple AIO requests in parallel, he must make multiple
 		 * separate AIO calls.
+		 *
+		 * Also return the error if no data has been processed so far.
 		 */
 		if (err <= 0) {
-			if (err == -EIOCBQUEUED)
+			if (err == -EIOCBQUEUED || !ret)
 				ret = err;
 			goto out;
 		}