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Commit 8713e012 authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds
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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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus 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) {