From: Chen Gang <gang.chen@asianux.com>
Date: Wed, 11 Sep 2013 21:24:35 +0000 (-0700)
Subject: fs/proc/task_mmu.c: check the return value of mpol_to_str()
X-Git-Tag: v3.12-rc1~52^2~78
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a3c039929d01f793c47922017b6c0ae438e11598;p=pandora-kernel.git

fs/proc/task_mmu.c: check the return value of mpol_to_str()

mpol_to_str() may fail, and not fill the buffer (e.g. -EINVAL), so need
check about it, or buffer may not be zero based, and next seq_printf()
will cause issue.

The failure return need after mpol_cond_put() to match get_vma_policy().

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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