udp packets cause kernel oops in ip_push_pending_frames linux 2.6.23.5

[bugsmakemylifehell]

I have a kernel module that uses netfilter to catch the packets at NF_IP_LOCAL_OUT hook.These are udp packets which encapsulate tcp packets withing them like ip->udp->ip'->tcp.

In the hook, I strip the ip and udp header out to recover the ip->tcp original packet.Sometimes , I get this message.

ip_push_pending_frames+0x38b/0x46c

and it kills my process.

Any ideas on how to prevent this ? This is very important for me.

Thank you advanced

[Rubberman]

Without looking at your souce code, there isn't much to say at this point.

[bugsmakemylifehell]

the source is as follows:


iph=(struct iphdr*)skb->network_header;
skb->data=skb->data+iph->ihl*4+sizeof(struct udphdr);
skb->len-=iph->ihl*4+sizeof(struct udphdr);
skb->network_header=skb->data;
iph=(struct iphdr*)skb->network_header;
skb->transport_header=skb->data+iph->ihl*4;

[Rubberman]

Someone else might make something of that, but I need more context. If you put your code inside code

/* place code here */

blocks, it will be easier to read since it will maintain indentation, etc.