diff options
| author | Miklos Szeredi <mszeredi@redhat.com> | 2016-06-29 10:54:23 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2016-06-30 23:28:09 -0400 |
| commit | b403f0e37a11f84f7ceaf40b0075499e5bcfd220 (patch) | |
| tree | 50cece69d070007009655f40e488c20da578b990 | |
| parent | b42b90d177d0c7f46f9c888c10c7900578ae7e09 (diff) | |
9p: use file_dentry()
v9fs may be used as lower layer of overlayfs and accessing f_path.dentry
can lead to a crash. In this case it's a NULL pointer dereference in
p9_fid_create().
Fix by replacing direct access of file->f_path.dentry with the
file_dentry() accessor, which will always return a native object.
Reported-by: Alessio Igor Bogani <alessioigorbogani@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Tested-by: Alessio Igor Bogani <alessioigorbogani@gmail.com>
Fixes: 4bacc9c9234c ("overlayfs: Make f_path always point to the overlay and f_inode to the underlay")
Cc: <stable@vger.kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>