Import patched pcap_layers.c code with buffer overflow bugfix

[wessels]

Debugged overflow bug in fragment processing thanks to packet capture provided by L-root.

[jelu]

@wessels: Are the fragments in l->frags always in the correct order?

[wessels]

/*
 * Insert frag into list ordered by offset
 */
for (F = &l->frags; *F && ((*F)->offset < f->offset); F = &(*F)->next);
f->next = *F;
*F = f;

[jelu]

@wessels Thanks, didn't see that at first. So this might happen when you have a bad router or is under fragmentation attack, wound it not be interesting to do statistics about that or at least log it?