linux-kernel - [PATCH] mm: incorrect overflow check in shrink

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 1 Dec 2011 04:20:34 -0500
From:	Xi Wang <xi.wang@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	Minchan Kim <minchan.kim@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <jweiner@...hat.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mm: incorrect overflow check in shrink_slab()

total_scan is unsigned long, so the overflow check (total_scan < 0)
didn't work.

Signed-off-by: Xi Wang <xi.wang@...il.com>
---
 mm/vmscan.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index a1893c0..46a04e7 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -270,7 +270,7 @@ unsigned long shrink_slab(struct shrink_control *shrink,
 		delta *= max_pass;
 		do_div(delta, lru_pages + 1);
 		total_scan += delta;
-		if (total_scan < 0) {
+		if ((long)total_scan < 0) {
 			printk(KERN_ERR "shrink_slab: %pF negative objects to "
 			       "delete nr=%ld\n",
 			       shrinker->shrink, total_scan);
-- 
1.7.5.4


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/