3.16.7-ckt26 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
commit c80567c82ae4814a41287618e315a60ecf513be6 upstream.
... into returning a positive to path_openat(), which would interpret that
as "symlink had been encountered" and proceed to corrupt memory, etc.
It can only happen due to a bug in some ->open() instance or in some LSM
hook, etc., so we report any such event *and* make sure it doesn't trick
us into further unpleasantness.
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
fs/namei.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/fs/namei.c b/fs/namei.c
index 8a0c3d9d8298..34f8224be4ed 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3108,6 +3108,10 @@ opened:
goto exit_fput;
}
out:
+ if (unlikely(error > 0)) {
+ WARN_ON(1);
+ error = -EINVAL;
+ }
if (got_write)
mnt_drop_write(nd->path.mnt);
path_put(&save_parent);
--
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