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Date: Fri, 6 Sep 2013 04:54:38 +0100
From: Phillip Lougher <phillip@...ashfs.org.uk>
To: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc: Phillip Lougher <phillip@...ashfs.org.uk>
Subject: [PATCH 2/5] Squashfs: fix corruption checks in squashfs_lookup()
The dir_count and size fields when read from disk are sanity
checked for correctness. However, the sanity checks only check the
values are not greater than expected. As dir_count and size were
incorrectly defined as signed ints, this can lead to corrupted values
appearing as negative which are not trapped.
Signed-off-by: Phillip Lougher <phillip@...ashfs.org.uk>
---
fs/squashfs/namei.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/squashfs/namei.c b/fs/squashfs/namei.c
index 342a5aa..67cad77 100644
--- a/fs/squashfs/namei.c
+++ b/fs/squashfs/namei.c
@@ -147,7 +147,8 @@ static struct dentry *squashfs_lookup(struct inode *dir, struct dentry *dentry,
struct squashfs_dir_entry *dire;
u64 block = squashfs_i(dir)->start + msblk->directory_table;
int offset = squashfs_i(dir)->offset;
- int err, length, dir_count, size;
+ int err, length;
+ unsigned int dir_count, size;
TRACE("Entered squashfs_lookup [%llx:%x]\n", block, offset);
--
1.8.3.2
--
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