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author | Miklos Szeredi <mszeredi@redhat.com> | 2016-06-29 10:54:23 +0200 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-08-10 11:49:27 +0200 |
commit | 7d9f345ca6810010456e99c7cdea112b500b9547 (patch) | |
tree | c08ae1ce506d01b318d291449d5a84ae73d42d23 /fs/namespace.c | |
parent | 26015f0ad252dd1ae397a6b6e9400ca868f4e584 (diff) | |
download | linux-stable-7d9f345ca6810010456e99c7cdea112b500b9547.tar.gz linux-stable-7d9f345ca6810010456e99c7cdea112b500b9547.tar.bz2 linux-stable-7d9f345ca6810010456e99c7cdea112b500b9547.zip |
9p: use file_dentry()
commit b403f0e37a11f84f7ceaf40b0075499e5bcfd220 upstream.
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")
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/namespace.c')
0 files changed, 0 insertions, 0 deletions