The patch titled
Subject: mm/vmstat: fix divide error at __fragmentation_index
has been added to the -mm tree. Its filename is
mm-vmstat-fix-divide-error-at-__fragmentation_index.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-vmstat-fix-divide-error-at-__fragmentation_index.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-vmstat-fix-divide-error-at-__fragmentation_index.patch
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------------------------------------------------------
From: Wen Yang <wen.yang99@xxxxxxxxxx>
Subject: mm/vmstat: fix divide error at __fragmentation_index
When order is -1 or too big, *1UL << order* will be 0, which will cause
divide error. Although it seems that all callers of
__fragmentation_index() will only do so with a valid order, the patch can
make it more robust.
Should prevent reoccurrences of
https://bugzilla.kernel.org/show_bug.cgi?id=196555
Link: http://lkml.kernel.org/r/1501751520-2598-1-git-send-email-wen.yang99@xxxxxxxxxx
Signed-off-by: Wen Yang <wen.yang99@xxxxxxxxxx>
Reviewed-by: Jiang Biao <jiang.biao2@xxxxxxxxxx>
Suggested-by: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmstat.c | 3 +++
1 file changed, 3 insertions(+)
diff -puN mm/vmstat.c~mm-vmstat-fix-divide-error-at-__fragmentation_index mm/vmstat.c
--- a/mm/vmstat.c~mm-vmstat-fix-divide-error-at-__fragmentation_index
+++ a/mm/vmstat.c
@@ -870,6 +870,9 @@ static int __fragmentation_index(unsigne
{
unsigned long requested = 1UL << order;
+ if (WARN_ON_ONCE(order >= MAX_ORDER))
+ return 0;
+
if (!info->free_blocks_total)
return 0;
_
Patches currently in -mm which might be from wen.yang99@xxxxxxxxxx are
mm-vmstat-fix-divide-error-at-__fragmentation_index.patch
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