tree 38c5b762cbdf36877416e80f5009ec5e48c624b8
parent 4649602265495a3bb776d777c91dba569f4afb5d
author Chen Gang <gang.chen@asianux.com> 1378934675 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1378940343 -0700

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>