Commit e1279ff7 authored Apr 03, 2019 by Hoang Le Committed by David S. Miller Apr 04, 2019

tipc: add NULL pointer check



skb somehow dequeued out of inputq before processing, it causes to
NULL pointer and kernel crashed.

Add checking skb valid before using.

Fixes: c55c8eda ("tipc: smooth change between replicast and broadcast")
Reported-by: Tuong Lien Tong <tuong.t.lien@dektech.com.au>
Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: Hoang Le <hoang.h.le@dektech.com.au>
Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 95e27a4d

net/tipc/bcast.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -769,6 +769,9 @@ void tipc_mcast_filter_msg(struct net net, struct sk_buff_head defq,
		u32 node, port;

		skb = skb_peek(inputq);
		if (!skb)
		return;

		hdr = buf_msg(skb);

		if (likely(!msg_is_syn(hdr) && skb_queue_empty(defq)))

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