From: Peter Hurley <peter@hurleysoftware.com>
Date: Fri, 8 Mar 2013 20:43:26 +0000 (-0800)
Subject: ipc: fix potential oops when src msg > 4k w/ MSG_COPY
X-Git-Tag: v3.8.3~46
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=32b25b63c222ff910834d577a6baa1f5a39b0a06;p=karo-tx-linux.git

ipc: fix potential oops when src msg > 4k w/ MSG_COPY

commit e1082f45f1e2bbf6e25f6b614fc6616ebf709d19 upstream.

If the src msg is > 4k, then dest->next points to the
next allocated segment; resetting it just prior to dereferencing
is bad.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Acked-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/ipc/msgutil.c b/ipc/msgutil.c
index ebfcbfa8b7f2..5df8e4bf1db0 100644
--- a/ipc/msgutil.c
+++ b/ipc/msgutil.c
@@ -117,9 +117,6 @@ struct msg_msg *copy_msg(struct msg_msg *src, struct msg_msg *dst)
 	if (alen > DATALEN_MSG)
 		alen = DATALEN_MSG;
 
-	dst->next = NULL;
-	dst->security = NULL;
-
 	memcpy(dst + 1, src + 1, alen);
 
 	len -= alen;