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| author | Jaegeuk Kim <jaegeuk@kernel.org> | 2016-04-11 22:15:38 (GMT) |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2016-04-12 17:24:22 (GMT) |
| commit | 33b1395124c63ed4a42e33c1dd14859f9b3f29c2 (patch) | |
| tree | 60ded5e8774cb091f56d58756c9d16211266050b /fs/f2fs | |
| parent | d7d75352890447b55c13a81df316a6894ff32ecf (diff) | |
| download | linux-33b1395124c63ed4a42e33c1dd14859f9b3f29c2.tar.xz | |
f2fs: use dget_parent and file_dentry in f2fs_file_open
This patch synced with the below two ext4 crypto fixes together.
In 4.6-rc1, f2fs newly introduced accessing f_path.dentry which crashes
overlayfs. To fix, now we need to use file_dentry() to access that field.
Fixes: c0a37d487884 ("ext4: use file_dentry()")
Fixes: 9dd78d8c9a7b ("ext4: use dget_parent() in ext4_file_open()")
Cc: Miklos Szeredi <mszeredi@redhat.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs')
| -rw-r--r-- | fs/f2fs/file.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 443e077..90d1157 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -441,7 +441,7 @@ static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma) static int f2fs_file_open(struct inode *inode, struct file *filp) { int ret = generic_file_open(inode, filp); - struct inode *dir = filp->f_path.dentry->d_parent->d_inode; + struct dentry *dir; if (!ret && f2fs_encrypted_inode(inode)) { ret = fscrypt_get_encryption_info(inode); @@ -450,9 +450,13 @@ static int f2fs_file_open(struct inode *inode, struct file *filp) if (!fscrypt_has_encryption_key(inode)) return -ENOKEY; } - if (f2fs_encrypted_inode(dir) && - !fscrypt_has_permitted_context(dir, inode)) + dir = dget_parent(file_dentry(filp)); + if (f2fs_encrypted_inode(d_inode(dir)) && + !fscrypt_has_permitted_context(d_inode(dir), inode)) { + dput(dir); return -EPERM; + } + dput(dir); return ret; } |