linux-kernel - [PATCH 1/2] ipc/mqueue: Delete an unnecessary check before the macro call “dev_kfree

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Date:   Thu, 22 Aug 2019 16:52:55 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     kernel-janitors@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        David Howells <dhowells@...hat.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Kees Cook <keescook@...omium.org>,
        Li Rongqing <lirongqing@...du.com>
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] ipc/mqueue: Delete an unnecessary check before the macro call “dev_kfree_skb”

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Thu, 22 Aug 2019 14:07:57 +0200

The dev_kfree_skb() function performs also input parameter validation.
Thus the test around the call is not needed.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 ipc/mqueue.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 7a5a8edc3de3..494ab78863f4 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -1334,7 +1334,7 @@ static int do_mq_notify(mqd_t mqdes, const struct sigevent *notification)
 out:
 	if (sock)
 		netlink_detachskb(sock, nc);
-	else if (nc)
+	else
 		dev_kfree_skb(nc);

 	return ret;
--
2.23.0