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ANDROID: sdcardfs: Check stacked filesystem depth

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bug: 111860541
Change-Id: Ia0a30b2b8956c4ada28981584cd8647713a1e993
Signed-off-by: Daniel Rosenberg <drosen@google.com>
This commit is contained in:
Daniel Rosenberg 2018-07-26 16:32:09 -07:00
parent 7a77ef209c
commit 9664bdeff3
1 changed files with 7 additions and 0 deletions
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7
fs/sdcardfs/main.c
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@ -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;