linux-kernel - [PATCH 3.11 053/137] tipc: clear 'next'-pointer of message fragments before reassembly

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Message-Id: <1408354398-10226-54-git-send-email-luis.henriques@canonical.com>
Date:	Mon, 18 Aug 2014 10:31:54 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Jon Maloy <jon.maloy@...csson.com>,
	"David S. Miller" <davem@...emloft.net>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.11 053/137] tipc: clear 'next'-pointer of message fragments before reassembly

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

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

From: Jon Paul Maloy <jon.maloy@...csson.com>

commit 999417549c16dd0e3a382aa9f6ae61688db03181 upstream.

If the 'next' pointer of the last fragment buffer in a message is not
zeroed before reassembly, we risk ending up with a corrupt message,
since the reassembly function itself isn't doing this.

Currently, when a buffer is retrieved from the deferred queue of the
broadcast link, the next pointer is not cleared, with the result as
described above.

This commit corrects this, and thereby fixes a bug that may occur when
long broadcast messages are transmitted across dual interfaces. The bug
has been present since 40ba3cdf542a469aaa9083fa041656e59b109b90 ("tipc:
message reassembly using fragment chain")

This commit should be applied to both net and net-next.

Signed-off-by: Jon Maloy <jon.maloy@...csson.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 net/tipc/bcast.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index 716de1ac6cb5..6ef89256b2fb 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -531,6 +531,7 @@ receive:

 		buf = node->bclink.deferred_head;
 		node->bclink.deferred_head = buf->next;
+		buf->next = NULL;
 		node->bclink.deferred_size--;
 		goto receive;
 	}
-- 
1.9.1

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