linux-kernel - [PATCH] Squashfs: fix mount time sanity check for corrupted superblock

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Message-ID: <4f02435c.KriZjDqB1gbu6Lro%phillip@lougher.demon.co.uk>
Date:	Mon, 02 Jan 2012 23:53:00 +0000
From:	Phillip Lougher <phillip@...gher.demon.co.uk>
To:	linux-kernel@...r.kernel.org
Cc:	linux-fsdevel@...r.kernel.org
Subject: [PATCH] Squashfs: fix mount time sanity check for corrupted
 superblock


A Squashfs filesystem containing nothing but an empty directory,
although unusual and ultimately pointless, is still valid.

The directory_table >= next_table sanity check rejects these
filesystems as invalid because the directory_table is empty and
equal to next_table.

Signed-off-by: Phillip Lougher <phillip@...ashfs.org.uk>
---
 fs/squashfs/super.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c
index 2da1715..4619247 100644
--- a/fs/squashfs/super.c
+++ b/fs/squashfs/super.c
@@ -290,7 +290,7 @@ handle_fragments:
 
 check_directory_table:
 	/* Sanity check directory_table */
-	if (msblk->directory_table >= next_table) {
+	if (msblk->directory_table > next_table) {
 		err = -EINVAL;
 		goto failed_mount;
 	}
-- 
1.7.5.4

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