netdev - Bug in using inet

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Date:	Wed, 14 Nov 2007 09:26:18 +0000 (GMT)
From:	Nj A <nj_a83@...oo.fr>
To:	netdev@...r.kernel.org
Subject: Bug in using inet_lookup ()

Dear All,
I need to use the inet_lookup function to find the sock structure of a TCP connection in a SYN_RECV state.
Here is what I used to do so:
/* The kernel TCP hashtable */
struct inet_hashinfo __cacheline_aligned tcp_hashinfo = {
.lhash_lock = __RW_LOCK_UNLOCKED (tcp_hashinfo.lhash_lock),
.lhash_users = ATOMIC_INIT (0),
.lhash_wait = __WAIT_QUEUE_HEAD_INITIALIZER (tcp_hashinfo.lhash_wait),
};
...
struct sock *sk;
struct sk_buff *skb;
skb = alloc_skb (MAX_TCP_HEADER + 15, GFP_KERNEL);
if (skb == NULL)
printk ("%s: Unable to allocate memory \n", __FUNCTION__);
sk = inet_lookup (&tcp_hashinfo, ip_src, src_port, ip_dst, dst_port, inet_iif (skb));
if (!sk)
...
This portion of code seems to cause the kernel to panic due to dereferencing a NULL pointer.
Can anyone please tell me what is the error above?
Best Regards,

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