Commit 8713e012 authored Apr 30, 2009 by Andrew Morton Committed by Linus Torvalds May 02, 2009

vmscan: avoid multiplication overflow in shrink_zone()



Local variable `scan' can overflow on zones which are larger than

	(2G * 4k) / 100 = 80GB.

Making it 64-bit on 64-bit will fix that up.

Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 0ae05fb2

mm/vmscan.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1471,7 +1471,7 @@ static void shrink_zone(int priority, struct zone *zone,

		for_each_evictable_lru(l) {
		int file = is_file_lru(l);
		int scan;
		unsigned long scan;

		scan = zone_nr_pages(zone, sc, l);
		if (priority) {

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