From: dann frazier <dann.frazier@canonical.com>
Date: Thu, 18 Nov 2010 22:03:09 +0000 (-0700)
Subject: ocfs2_connection_find() returns pointer to bad structure
X-Git-Tag: v2.6.37-rc5~1^2
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=226291aa4641fa13cb5dec3bcb3379faa83009e2;p=~shefty%2Frdma-dev.git

ocfs2_connection_find() returns pointer to bad structure

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@canonical.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
---

diff --git a/fs/ocfs2/stack_user.c b/fs/ocfs2/stack_user.c
index 252e7c82f92..a5ebe421195 100644
--- a/fs/ocfs2/stack_user.c
+++ b/fs/ocfs2/stack_user.c
@@ -190,7 +190,7 @@ static struct ocfs2_live_connection *ocfs2_connection_find(const char *name)
 			return c;
 	}
 
-	return c;
+	return NULL;
 }
 
 /*