| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.14 49/84] net: pktgen: fix race between pktgen_thread_worker() and kthread_stop() | Date | Tue, 29 Sep 2015 17:18:41 +0200 |
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3.14-stable review patch. If anyone has any objections, please let me know.
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From: Oleg Nesterov <oleg@redhat.com>
[ 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> --- net/core/pktgen.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/net/core/pktgen.c +++ b/net/core/pktgen.c @@ -3464,8 +3464,10 @@ static int pktgen_thread_worker(void *ar 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);
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