linux-kernel - [PATCH 3.12 09/33] net: pktgen: fix race between pktgen_thread_worker() and kthread

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Message-Id: <6f137d152fcf65346b399050835addf72ec04642.1442326825.git.jslaby@suse.cz>
Date:	Tue, 15 Sep 2015 16:22:04 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Oleg Nesterov <oleg@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 09/33] net: pktgen: fix race between pktgen_thread_worker() and kthread_stop()

From: Oleg Nesterov <oleg@...hat.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

[ Upstream commit fecdf8be2d91e04b0a9a4f79ff06499a36f5d14f ]

pktgen_thread_worker() is obviously racy, kthread_stop() can come
between the kthread_should_stop() check and set_current_state().

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
Reported-by: Jan Stancek <jstancek@...hat.com>
Reported-by: Marcelo Leitner <mleitner@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 net/core/pktgen.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index a104ba3c5768..cea47344d535 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -3423,8 +3423,10 @@ static int pktgen_thread_worker(void *arg)
 	pktgen_rem_thread(t);
 
 	/* Wait for kthread_stop */
-	while (!kthread_should_stop()) {
+	for (;;) {
 		set_current_state(TASK_INTERRUPTIBLE);
+		if (kthread_should_stop())
+			break;
 		schedule();
 	}
 	__set_current_state(TASK_RUNNING);
-- 
2.5.2

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