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.
Signed-off-by: Chen Gang <gang.chen@xxxxxxxxxxx>
Cc: Cyrill Gorcunov <gorcunov@xxxxxxxxx>
---
mm/shmem.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/mm/shmem.c b/mm/shmem.c
index e59d332..ae5112f 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -886,11 +886,14 @@ redirty:
static int shmem_show_mpol(struct seq_file *seq, struct mempolicy *mpol)
{
char buffer[64];
+ int ret;
if (!mpol || mpol->mode == MPOL_DEFAULT)
return 0; /* show nothing */
- mpol_to_str(buffer, sizeof(buffer), mpol);
+ ret = mpol_to_str(buffer, sizeof(buffer), mpol);
+ if (ret < 0)
+ return ret;
seq_printf(seq, ",mpol=%s", buffer);
return 0;
--
1.7.7.6
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