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Date: Fri, 28 Dec 2012 03:16:38 +0100 From: Zlatko Calusic <zlatko.calusic@...on.hr> To: Andrew Morton <akpm@...ux-foundation.org>, Mel Gorman <mgorman@...e.de> CC: Linus Torvalds <torvalds@...ux-foundation.org>, Hugh Dickins <hughd@...gle.com>, linux-mm <linux-mm@...ck.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Zhouping Liu <zliu@...hat.com>, Sedat Dilek <sedat.dilek@...il.com> Subject: [PATCH] mm: fix null pointer dereference in wait_iff_congested() From: Zlatko Calusic <zlatko.calusic@...on.hr> The unintended consequence of commit 4ae0a48b is that wait_iff_congested() can now be called with NULL struct zone* producing kernel oops like this: BUG: unable to handle kernel NULL pointer dereference IP: [<ffffffff811542d9>] wait_iff_congested+0x59/0x140 This trivial patch fixes it. Reported-by: Zhouping Liu <zliu@...hat.com> Reported-and-tested-by: Sedat Dilek <sedat.dilek@...il.com> Cc: Andrew Morton <akpm@...ux-foundation.org> Cc: Mel Gorman <mgorman@...e.de> Cc: Hugh Dickins <hughd@...gle.com> Signed-off-by: Zlatko Calusic <zlatko.calusic@...on.hr> --- mm/vmscan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 02bcfa3..e55ce55 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2782,7 +2782,7 @@ loop_again: if (total_scanned && (sc.priority < DEF_PRIORITY - 2)) { if (has_under_min_watermark_zone) count_vm_event(KSWAPD_SKIP_CONGESTION_WAIT); - else + else if (unbalanced_zone) wait_iff_congested(unbalanced_zone, BLK_RW_ASYNC, HZ/10); } -- 1.8.1.rc3 -- Zlatko -- 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/
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