linux-kernel - [PATCH] vmpressure: fix divide-by-0 in vmpressure_work

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Message-ID: <alpine.LNX.2.00.1309062254470.11420@eggly.anvils>
Date:	Fri, 6 Sep 2013 22:59:16 -0700 (PDT)
From:	Hugh Dickins <hughd@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Anton Vorontsov <anton.vorontsov@...aro.org>,
	Michal Hocko <mhocko@...e.cz>,
	David Rientjes <rientjes@...gle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH] vmpressure: fix divide-by-0 in vmpressure_work_fn

Hit divide-by-0 in vmpressure_work_fn(): checking vmpr->scanned before
taking the lock is not enough, we must check scanned afterwards too.

Signed-off-by: Hugh Dickins <hughd@...gle.com>
Cc: stable@...r.kernel.org
---

 mm/vmpressure.c |    3 +++
 1 file changed, 3 insertions(+)

--- 3.11/mm/vmpressure.c	2013-09-02 13:46:10.000000000 -0700
+++ linux/mm/vmpressure.c	2013-09-06 22:43:03.596003080 -0700
@@ -187,6 +187,9 @@ static void vmpressure_work_fn(struct wo
 	vmpr->reclaimed = 0;
 	spin_unlock(&vmpr->sr_lock);
 
+	if (!scanned)
+		return;
+
 	do {
 		if (vmpressure_event(vmpr, scanned, reclaimed))
 			break;
--
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