linux-kernel - [PATCH] LLC: Avoid potential NULL dereference in net/llc/af_llc.c::llc_ui

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Date:	Thu, 2 Nov 2006 01:21:53 +0100
From:	Jesper Juhl <jesper.juhl@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Jay Schulist <jschlst@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...ectiva.com.br>,
	davem@...emloft.net, Jesper Juhl <jesper.juhl@...il.com>
Subject: [PATCH] LLC: Avoid potential NULL dereference in net/llc/af_llc.c::llc_ui_accept() .

Since skb_dequeue() may return NULL we risk dereferencing a NULL pointer at
  if (!skb->sk)
This patch avoids that by also testing for a NULL skb.


Signed-off-by: Jesper Juhl <jesper.juhl@...il.com>
---

diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
index 2652ead..a3c885f 100644
--- a/net/llc/af_llc.c
+++ b/net/llc/af_llc.c
@@ -620,7 +620,7 @@ static int llc_ui_accept(struct socket *
 	        llc_sk(sk)->laddr.lsap);
 	skb = skb_dequeue(&sk->sk_receive_queue);
 	rc = -EINVAL;
-	if (!skb->sk)
+	if (!skb || !skb->sk)
 		goto frees;
 	rc = 0;
 	newsk = skb->sk;


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