linux-kernel - [2.6 patch] net/llc/llc_conn.c: fix possible NULL dereference

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Date:	Sat, 19 May 2007 13:13:07 +0800
From:	Eugene Teo <eteo@...hat.com>
To:	linux-kernel@...r.kernel.org
CC:	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [2.6 patch] net/llc/llc_conn.c: fix possible NULL dereference

skb_peek() might return an empty list. skb should be checked before calling
llc_pdu_sn_hdr() with it.

Spotted by the Coverity checker.

Signed-off-by: Eugene Teo <eteo@...hat.com>

diff --git a/net/llc/llc_conn.c b/net/llc/llc_conn.c
index 3b8cfbe..28a3994 100644
--- a/net/llc/llc_conn.c
+++ b/net/llc/llc_conn.c
@@ -323,7 +323,8 @@ int llc_conn_remove_acked_pdus(struct sock *sk, u8 nr, u16
*how_many_unacked)

        if (!q_len)
                goto out;
-       skb = skb_peek(&llc->pdu_unack_q);
+       if (! (skb = skb_peek(&llc->pdu_unack_q)))
+               goto out;
        pdu = llc_pdu_sn_hdr(skb);

        /* finding position of last acked pdu in queue */

-
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