linux-kernel - [PATCH] [114/275] ocfs2_connection_find() returns pointer to bad structure

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 for Android: free password hash cracker in your pocket

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

Message-Id: <20110330210553.B12413E1A05@tassilo.jf.intel.com>
Date:	Wed, 30 Mar 2011 14:05:53 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	dann.frazier@...onical.com, joel.becker@...cle.com, gregkh@...e.de,
	ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	stable@...nel.org, tim.bird@...sony.com
Subject: [PATCH] [114/275] ocfs2_connection_find() returns pointer to bad structure

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: dann frazier <dann.frazier@...onical.com>

commit 226291aa4641fa13cb5dec3bcb3379faa83009e2 upstream.

If ocfs2_live_connection_list is empty, ocfs2_connection_find() will return
a pointer to the LIST_HEAD, cast as a ocfs2_live_connection. This can cause
an oops when ocfs2_control_send_down() dereferences c->oc_conn:

Call Trace:
  [<ffffffffa00c2a3c>] ocfs2_control_message+0x28c/0x2b0 [ocfs2_stack_user]
  [<ffffffffa00c2a95>] ocfs2_control_write+0x35/0xb0 [ocfs2_stack_user]
  [<ffffffff81143a88>] vfs_write+0xb8/0x1a0
  [<ffffffff8155cc13>] ? do_page_fault+0x153/0x3b0
  [<ffffffff811442f1>] sys_write+0x51/0x80
  [<ffffffff810121b2>] system_call_fastpath+0x16/0x1b

Fix by explicitly returning NULL if no match is found.

Signed-off-by: dann frazier <dann.frazier@...onical.com>
Signed-off-by: Joel Becker <joel.becker@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 fs/ocfs2/stack_user.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.35.y/fs/ocfs2/stack_user.c
===================================================================
--- linux-2.6.35.y.orig/fs/ocfs2/stack_user.c	2011-03-29 22:51:23.042133577 -0700
+++ linux-2.6.35.y/fs/ocfs2/stack_user.c	2011-03-29 23:03:00.557285910 -0700
@@ -191,7 +191,7 @@
 			return c;
 	}

-	return c;
+	return NULL;
 }

 /*
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/