linux-kernel - [PATCH linux-next] ipc: fix local variable initialization in compat_do_msg

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Date:	Thu, 19 Apr 2012 16:21:24 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	linux-kernel@...r.kernel.org
Cc:	Stanislav Kinsbursky <skinsbursky@...allels.com>,
	Arnd Bergmann <arnd@...db.de>,
	Pavel Emelyanov <xemul@...allels.com>,
	Chris Metcalf <cmetcalf@...era.com>,
	Lucas De Marchi <lucas.de.marchi@...il.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH linux-next] ipc: fix local variable initialization in
 compat_do_msg_fill()

The "msgp" must points to the userspace buffer.

fix for linux-next commit 774d0252d303969a7281eefd6eaccde50bb6eb6e
("c/r: ipc: message queue receive cleanup")

Signed-off-by: Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc: Stanislav Kinsbursky <skinsbursky@...allels.com>
Cc: Lucas De Marchi <lucas.de.marchi@...il.com>
Cc: Chris Metcalf <cmetcalf@...era.com>
Cc: Cyrill Gorcunov <gorcunov@...nvz.org>
Cc: Pavel Emelyanov <xemul@...allels.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
 ipc/compat.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ipc/compat.c b/ipc/compat.c
index 6da376b..0c2ebd0 100644
--- a/ipc/compat.c
+++ b/ipc/compat.c
@@ -363,7 +363,7 @@ static long compat_do_msg_steal(void __user *dest, struct msg_msg *msg, size_t b
 
 long compat_do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz)
 {
-	struct compat_msgbuf __user *msgp;
+	struct compat_msgbuf __user *msgp = dest;
 	size_t msgsz;
 
 	if (put_user(msg->m_type, &msgp->mtype))

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