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Commit fed0824a authored by Daniel Rosenberg's avatar Daniel Rosenberg Committed by Gerrit - the friendly Code Review server
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ANDROID: sdcardfs: Check stacked filesystem depth 



bug: 111860541
Change-Id: Ia0a30b2b8956c4ada28981584cd8647713a1e993
Signed-off-by: default avatarDaniel Rosenberg <drosen@google.com>
(cherry picked from commit 9664bdeff388afe4749eee2332bc0cc220b6cee2)
Git-commit: 9664bdeff388afe4749eee2332bc0cc220b6cee2
Git-repo: https://android.googlesource.com/kernel/common/


Signed-off-by: default avatarRitesh Harjani <riteshh@codeaurora.org>
parent 0e75cda3

fs/sdcardfs/main.c

+7 −0
Original line number Diff line number Diff line
@@ -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;