+ mm-backing-devc-fix-error-path-in-wb_init.patch added to -mm tree

+ mm-backing-devc-fix-error-path-in-wb_init.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm/backing-dev.c: fix error path in wb_init()
has been added to the -mm tree.  Its filename is
     mm-backing-devc-fix-error-path-in-wb_init.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/mm-backing-devc-fix-error-path-in-wb_init.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/mm-backing-devc-fix-error-path-in-wb_init.patch

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------------------------------------------------------
From: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Subject: 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>
---

 mm/backing-dev.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN mm/backing-dev.c~mm-backing-devc-fix-error-path-in-wb_init mm/backing-dev.c
--- a/mm/backing-dev.c~mm-backing-devc-fix-error-path-in-wb_init
+++ a/mm/backing-dev.c
@@ -328,7 +328,7 @@ static int wb_init(struct bdi_writeback
 	return 0;
 
 out_destroy_stat:
-	while (--i)
+	while (i--)
 		percpu_counter_destroy(&wb->stat[i]);
 	fprop_local_destroy_percpu(&wb->completions);
 out_put_cong:
_

Patches currently in -mm which might be from linux@rasmusvillemoes.dk are

mm-backing-devc-fix-error-path-in-wb_init.patch