On Wed, Nov 14, 2007 at 09:26:18AM +0000, Nj A ([EMAIL PROTECTED]) wrote:
> /* 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,
Where exactly? Likely in inet_iif(), since it dereferences dst (routing
info), which is not presented after simple alloc_skb().
You have to setup skb correctly, check how ip_rcv() does it.
--
Evgeniy Polyakov
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