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authorTejun Heo <tj@kernel.org>2017-03-06 15:33:42 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-12-16 10:33:52 +0100
commitd9d47a6d6862df5536837b43407d3b527cad5090 (patch)
tree3a572348350c5aa66ad6e028aa89da9403c04325 /kernel
parent14a7aa2ae61e815c1bf5a1a6f5ae751e1a0a1cbc (diff)
workqueue: trigger WARN if queue_delayed_work() is called with NULL @wq
[ Upstream commit 637fdbae60d6cb9f6e963c1079d7e0445c86ff7d ] If queue_delayed_work() gets called with NULL @wq, the kernel will oops asynchronuosly on timer expiration which isn't too helpful in tracking down the offender. This actually happened with smc. __queue_delayed_work() already does several input sanity checks synchronously. Add NULL @wq check. Reported-by: Dave Jones <davej@codemonkey.org.uk> Link: http://lkml.kernel.org/r/20170227171439.jshx3qplflyrgcv7@codemonkey.org.uk Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/workqueue.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 95cc76785a12..85555eb4d3cb 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1479,6 +1479,7 @@ static void __queue_delayed_work(int cpu, struct workqueue_struct *wq,
struct timer_list *timer = &dwork->timer;
struct work_struct *work = &dwork->work;
+ WARN_ON_ONCE(!wq);
WARN_ON_ONCE(timer->function != delayed_work_timer_fn ||
timer->data != (unsigned long)dwork);
WARN_ON_ONCE(timer_pending(timer));