linux-ext4 - [PATCH 02/10] ext2fs: Fix overflow when checking s_inodes_count in ext2fs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20180530125118.25274-3-jack@suse.cz>
Date:   Wed, 30 May 2018 14:51:10 +0200
From:   Jan Kara <jack@...e.cz>
To:     Ted Tso <tytso@....edu>
Cc:     <linux-ext4@...r.kernel.org>, Jan Kara <jack@...e.cz>
Subject: [PATCH 02/10] ext2fs: Fix overflow when checking s_inodes_count in ext2fs_open()

The check whether s_inodes_count is correct in ext2fs_open() can
overflow and thus not catch all problematic cases. Fix the test.

Signed-off-by: Jan Kara <jack@...e.cz>
---
 lib/ext2fs/openfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/ext2fs/openfs.c b/lib/ext2fs/openfs.c
index 532e70f7f645..e9ad0cd1a2c6 100644
--- a/lib/ext2fs/openfs.c
+++ b/lib/ext2fs/openfs.c
@@ -386,7 +386,7 @@ errcode_t ext2fs_open2(const char *name, const char *io_options,
 		goto cleanup;
 	}
 	fs->group_desc_count = 	groups_cnt;
-	if (fs->group_desc_count * EXT2_INODES_PER_GROUP(fs->super) !=
+	if ((__u64)fs->group_desc_count * EXT2_INODES_PER_GROUP(fs->super) !=
 	    fs->super->s_inodes_count) {
 		retval = EXT2_ET_CORRUPT_SUPERBLOCK;
 		goto cleanup;
-- 
2.13.6