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| author | Miklos Szeredi <mszeredi@redhat.com> | 2016-03-26 16:14:42 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2016-03-26 16:14:42 -0400 |
| commit | c0a37d48788475d0a2cf4fbfaa28559a9de612fc (patch) | |
| tree | 64c24a6576795c43e118427c9838892421f529ca /fs/ext4 | |
| parent | 9dd78d8c9a7bd4bc341f5864db32d4331b8eae4c (diff) | |
| download | linux-c0a37d48788475d0a2cf4fbfaa28559a9de612fc.tar.gz linux-c0a37d48788475d0a2cf4fbfaa28559a9de612fc.tar.bz2 linux-c0a37d48788475d0a2cf4fbfaa28559a9de612fc.zip | |
ext4: use file_dentry()
EXT4 may be used as lower layer of overlayfs and accessing f_path.dentry
can lead to a crash.
Fix by replacing direct access of file->f_path.dentry with the
file_dentry() accessor, which will always return a native object.
Reported-by: Daniel Axtens <dja@axtens.net>
Fixes: 4bacc9c9234c ("overlayfs: Make f_path always point to the overlay and f_inode to the underlay")
Fixes: ff978b09f973 ("ext4 crypto: move context consistency check to ext4_file_open()")
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: David Howells <dhowells@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: <stable@vger.kernel.org> # v4.5
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/file.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext4/file.c b/fs/ext4/file.c index 257118d4d078..edba9fb9bb0d 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -374,7 +374,7 @@ static int ext4_file_open(struct inode * inode, struct file * filp) return -ENOKEY; } - dir = dget_parent(filp->f_path.dentry); + dir = dget_parent(file_dentry(filp)); if (ext4_encrypted_inode(d_inode(dir)) && !ext4_is_child_context_consistent_with_parent(d_inode(dir), inode)) { ext4_warning(inode->i_sb, |