Hi all,
My kernel is 3.10.20 and I encountered this NULL pointer dereference.
According to my log, I found that dev is NULL in the beginning of for
loop. it is the dev of rr_head that has been set to NULL. That might be
possible that dev being NULL but I don't see any case to avoid such case
in rt6_check_dev(), even the kernel 4.0.
Don't know if my concern is necessary or not or there has a mechanism in
somewhere that I hadn't been noticed.
Any comment of my concern is welcome and thanks for your time to review my
post.
for (rt = rr_head; rt && rt->rt6i_metric == metric; rt = rt->dst.rt6_next)
match = find_match(rt, oif, strict, &mpri, match, do_rr);
--> rt6_score_route(rt, oif, strict);
--> rt6_check_dev(rt, oif);
--> struct net_device *dev = rt->dst.dev;
--> if (!oif || dev->ifindex == oif) <------NULL pointer dereference
on dev object.
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