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mm/backing-dev.c: fix error path in wb_init() 

We need to use post-decrement to get percpu_counter_destroy() called on
&wb->stat[0].  Moreover, the pre-decremebt would cause infinite
out-of-bounds accesses if the setup code failed at i==0.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Vladimir Davydov <vdavydov@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rasmus Villemoes 2016-02-11 16:13:06 -08:00 committed by Linus Torvalds
parent 6b9116a652
commit 078c6c3a5e
1 changed files with 1 additions and 1 deletions
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2
mm/backing-dev.c
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@ -328,7 +328,7 @@ static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi,
return 0;
out_destroy_stat:
while (--i)
while (i--)
percpu_counter_destroy(&wb->stat[i]);
fprop_local_destroy_percpu(&wb->completions);
out_put_cong: