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authorChen Gang <gang.chen@asianux.com>2013-09-11 14:24:35 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-09-11 15:59:03 -0700
commita3c039929d01f793c47922017b6c0ae438e11598 (patch)
tree38c5b762cbdf36877416e80f5009ec5e48c624b8
parent4649602265495a3bb776d777c91dba569f4afb5d (diff)
downloadlinux-a3c039929d01f793c47922017b6c0ae438e11598.tar.bz2
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>
-rw-r--r--fs/proc/task_mmu.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 09228639b83d..7366e9d63cee 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -1402,8 +1402,10 @@ static int show_numa_map(struct seq_file *m, void *v, int is_pid)
walk.mm = mm;
pol = get_vma_policy(task, vma, vma->vm_start);
- mpol_to_str(buffer, sizeof(buffer), pol);
+ n = mpol_to_str(buffer, sizeof(buffer), pol);
mpol_cond_put(pol);
+ if (n < 0)
+ return n;
seq_printf(m, "%08lx %s", vma->vm_start, buffer);