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net: pktgen: fix race between pktgen_thread_worker() and kthread_stop() 

[ 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@redhat.com>
Reported-by: Jan Stancek <jstancek@redhat.com>
Reported-by: Marcelo Leitner <mleitner@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oleg Nesterov 2015-07-08 21:42:11 +02:00 committed by Greg Kroah-Hartman
parent 7865ece30f
commit f85eee641c
1 changed files with 3 additions and 1 deletions
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4
net/core/pktgen.c
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@ -3377,8 +3377,10 @@ 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);