linux-kernel - [PATCH 3.10 28/34] ipc: fix compat msgrcv with negative msgtyp

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Message-Id: <20150417132555.505040835@linuxfoundation.org>
Date:	Fri, 17 Apr 2015 15:29:00 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Mateusz Guzik <mguzik@...hat.com>,
	Gabriellla Schmidt <gsc@...ker.de>,
	Al Viro <viro@...iv.linux.org.uk>,
	Davidlohr Bueso <davidlohr@...com>,
	Manfred Spraul <manfred@...orfullife.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Masanari Iida <standby24x7@...il.com>
Subject: [PATCH 3.10 28/34] ipc: fix compat msgrcv with negative msgtyp

3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mateusz Guzik <mguzik@...hat.com>

commit e7ca2552369c1dfe0216c626baf82c3d83ec36bb upstream.

Compat function takes msgtyp argument as u32 and passes it down to
do_msgrcv which results in casting to long, thus the sign is lost and we
get a big positive number instead.

Cast the argument to signed type before passing it down.

Signed-off-by: Mateusz Guzik <mguzik@...hat.com>
Reported-by: Gabriellla Schmidt <gsc@...ker.de>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Davidlohr Bueso <davidlohr@...com>
Cc: Manfred Spraul <manfred@...orfullife.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Masanari Iida <standby24x7@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 ipc/compat.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/ipc/compat.c
+++ b/ipc/compat.c
@@ -381,7 +381,7 @@ COMPAT_SYSCALL_DEFINE6(ipc, u32, call, i
 			uptr = compat_ptr(ipck.msgp);
 			fifth = ipck.msgtyp;
 		}
-		return do_msgrcv(first, uptr, second, fifth, third,
+		return do_msgrcv(first, uptr, second, (s32)fifth, third,
 				 compat_do_msg_fill);
 	}
 	case MSGGET:


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