linux-kernel - [patch v2] Squashfs: sanity check information from disk

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Message-ID: <20130717122025.GA14232@mwanda>
Date:	Wed, 17 Jul 2013 15:20:25 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Phillip Lougher <phillip@...ashfs.org.uk>
Cc:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch v2] Squashfs: sanity check information from disk

We read the size of the name from the disk, but a larger name than
expected would cause memory corruption.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
v2: style change

diff --git a/fs/squashfs/namei.c b/fs/squashfs/namei.c
index 7834a51..bc1334c 100644
--- a/fs/squashfs/namei.c
+++ b/fs/squashfs/namei.c
@@ -79,7 +79,8 @@ static int get_dir_index_using_name(struct super_block *sb,
 			int len)
 {
 	struct squashfs_sb_info *msblk = sb->s_fs_info;
-	int i, size, length = 0, err;
+	int i, length = 0, err;
+	unsigned int size;
 	struct squashfs_dir_index *index;
 	char *str;
 
@@ -103,6 +104,10 @@ static int get_dir_index_using_name(struct super_block *sb,
 
 
 		size = le32_to_cpu(index->size) + 1;
+		if (size > SQUASHFS_NAME_LEN) {
+			err = -EINVAL;
+			break;
+		}
 
 		err = squashfs_read_metadata(sb, index->name, &index_start,
 					&index_offset, size);

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