diff options
| author | Daniel Rosenberg <drosen@google.com> | 2018-07-26 16:32:09 -0700 |
|---|---|---|
| committer | Daniel Rosenberg <drosen@google.com> | 2018-07-27 21:54:29 +0000 |
| commit | 9664bdeff388afe4749eee2332bc0cc220b6cee2 (patch) | |
| tree | 68e0820e96bc5395f790d1aa120fd45b91cc8265 | |
| parent | 7a77ef209cfb4e760c70e56bc5fdeaed8f34ed45 (diff) | |
ANDROID: sdcardfs: Check stacked filesystem depth
bug: 111860541
Change-Id: Ia0a30b2b8956c4ada28981584cd8647713a1e993
Signed-off-by: Daniel Rosenberg <drosen@google.com>
| -rw-r--r-- | fs/sdcardfs/main.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/sdcardfs/main.c b/fs/sdcardfs/main.c index 30e0c431a1ea..27ec726e7a46 100644 --- a/fs/sdcardfs/main.c +++ b/fs/sdcardfs/main.c @@ -295,6 +295,13 @@ static int sdcardfs_read_super(struct vfsmount *mnt, struct super_block *sb, atomic_inc(&lower_sb->s_active); sdcardfs_set_lower_super(sb, lower_sb); + sb->s_stack_depth = lower_sb->s_stack_depth + 1; + if (sb->s_stack_depth > FILESYSTEM_MAX_STACK_DEPTH) { + pr_err("sdcardfs: maximum fs stacking depth exceeded\n"); + err = -EINVAL; + goto out_sput; + } + /* inherit maxbytes from lower file system */ sb->s_maxbytes = lower_sb->s_maxbytes; |