diff options
| author | Andrew Chant <achant@google.com> | 2017-02-08 15:33:48 -0800 |
|---|---|---|
| committer | Mister Oyster <oysterized@gmail.com> | 2017-04-16 15:03:46 +0200 |
| commit | c04152e873b3e6ff4ca4bdde18b10e99fb43aa92 (patch) | |
| tree | c7e439f23982aad54eac0626dd4607ad363193a1 /fs | |
| parent | 56673e746547df572ed0da2a46ce7cb65791a649 (diff) | |
sdcardfs: limit stacking depth
Limit filesystem stacking to prevent stack overflow.
Bug: 32761463
Change-Id: I8b1462b9c0d6c7f00cf110724ffb17e7f307c51e
Signed-off-by: Andrew Chant <achant@google.com>
Diffstat (limited to 'fs')
| -rwxr-xr-x | 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 fe7507d41..bf3d3ab93 100755 --- a/fs/sdcardfs/main.c +++ b/fs/sdcardfs/main.c @@ -281,6 +281,13 @@ 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; |