linux-kernel - [ 057/100] ipc: fix potential oops when src msg > 4k w/ MSG

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Message-Id: <20130312223129.130783271@linuxfoundation.org>
Date:	Tue, 12 Mar 2013 15:31:42 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Peter Hurley <peter@...leysoftware.com>,
	Stanislav Kinsbursky <skinsbursky@...allels.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [ 057/100] ipc: fix potential oops when src msg > 4k w/ MSG_COPY

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

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

From: Peter Hurley <peter@...leysoftware.com>

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@...leysoftware.com>
Acked-by: Stanislav Kinsbursky <skinsbursky@...allels.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 ipc/msgutil.c |    3 ---
 1 file changed, 3 deletions(-)

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


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