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| author | Chen Gang <gang.chen@asianux.com> | 2013-09-11 14:24:35 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-09-11 15:59:03 -0700 |
| commit | a3c039929d01f793c47922017b6c0ae438e11598 (patch) | |
| tree | 38c5b762cbdf36877416e80f5009ec5e48c624b8 /fs/proc | |
| parent | 4649602265495a3bb776d777c91dba569f4afb5d (diff) | |
| download | linux-a3c039929d01f793c47922017b6c0ae438e11598.tar.gz linux-a3c039929d01f793c47922017b6c0ae438e11598.tar.bz2 linux-a3c039929d01f793c47922017b6c0ae438e11598.zip | |
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>
Diffstat (limited to 'fs/proc')
| -rw-r--r-- | fs/proc/task_mmu.c | 4 |
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); |