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

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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>
This commit is contained in:
Chen Gang 2013-09-11 14:24:35 -07:00 committed by Linus Torvalds
parent 4649602265
commit a3c039929d
1 changed files with 3 additions and 1 deletions
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4
fs/proc/task_mmu.c
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@ -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);