linux-ext4 - [PATCH ] ext3: Fix a possible corruption in dx

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-next>] [day] [month] [year] [list]

Message-Id: <1314806244-8434-1-git-send-email-tm@tao.ma>
Date:	Wed, 31 Aug 2011 23:57:24 +0800
From:	Tao Ma <tm@....ma>
To:	linux-ext4@...r.kernel.org
Cc:	Jan Kara <jack@...e.cz>
Subject: [PATCH ] ext3: Fix a possible corruption in dx_probe.

From: Tao Ma <boyu.mt@...bao.com>

For all the callers of dx_probe, frame_in is passed in uninitialized.
So we should set frame->bh to NULL in the beginning of while, not
the end. Otherwise, the first "goto fail2" will try to brelse(frame->bh)
while frame->bh is still invalid.

Cc: Jan Kara <jack@...e.cz>
Signed-off-by: Tao Ma <boyu.mt@...bao.com>
---
 fs/ext3/namei.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/ext3/namei.c b/fs/ext3/namei.c
index 34b6d9b..45468b9 100644
--- a/fs/ext3/namei.c
+++ b/fs/ext3/namei.c
@@ -404,6 +404,7 @@ dx_probe(struct qstr *entry, struct inode *dir,
 	dxtrace (printk("Look up %x", hash));
 	while (1)
 	{
+		frame->bh = NULL;
 		count = dx_get_count(entries);
 		if (!count || count > dx_get_limit(entries)) {
 			ext3_warning(dir->i_sb, __func__,
@@ -458,7 +459,6 @@ dx_probe(struct qstr *entry, struct inode *dir,
 			goto fail2;
 		}
 		frame++;
-		frame->bh = NULL;
 	}
 fail2:
 	while (frame >= frame_in) {
-- 
1.7.0.4

--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html