diff options
| author | Andrew Morton <akpm@linux-foundation.org> | 2014-12-02 15:59:28 -0800 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2015-01-07 16:20:08 +0100 |
| commit | 5a40e10cc3479a28bac0d4ca3134df7052cb46df (patch) | |
| tree | f4d1a01e6d4b1e0ae83074613428d5d4d4c93ad6 /mm | |
| parent | 94724f27bf02e417629d93101a3fbb0dcfe86c28 (diff) | |
mm/vmpressure.c: fix race in vmpressure_work_fn()
commit 91b57191cfd152c02ded0745250167d0263084f8 upstream.
In some android devices, there will be a "divide by zero" exception.
vmpr->scanned could be zero before spin_lock(&vmpr->sr_lock).
Addresses https://bugzilla.kernel.org/show_bug.cgi?id=88051
[akpm@linux-foundation.org: neaten]
Reported-by: ji_ang <ji_ang@163.com>
Cc: Anton Vorontsov <anton.vorontsov@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/vmpressure.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/mm/vmpressure.c b/mm/vmpressure.c index e0f62837c3f4..c98b14ee69d6 100644 --- a/mm/vmpressure.c +++ b/mm/vmpressure.c @@ -164,6 +164,7 @@ static void vmpressure_work_fn(struct work_struct *work) unsigned long scanned; unsigned long reclaimed; + spin_lock(&vmpr->sr_lock); /* * Several contexts might be calling vmpressure(), so it is * possible that the work was rescheduled again before the old @@ -172,11 +173,12 @@ static void vmpressure_work_fn(struct work_struct *work) * here. No need for any locks here since we don't care if * vmpr->reclaimed is in sync. */ - if (!vmpr->scanned) + scanned = vmpr->scanned; + if (!scanned) { + spin_unlock(&vmpr->sr_lock); return; + } - spin_lock(&vmpr->sr_lock); - scanned = vmpr->scanned; reclaimed = vmpr->reclaimed; vmpr->scanned = 0; vmpr->reclaimed = 0; |