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[IPV4]: OOPS with NETLINK_FIB_LOOKUP netlink socket 

[ Regression added by changeset:
	cd40b7d398
	[NET]: make netlink user -> kernel interface synchronious
  -DaveM ]

nl_fib_input re-reuses incoming skb to send the reply. This means that this
packet will be freed twice, namely in:
- netlink_unicast_kernel
- on receive path
Use clone to send as a cure, the caller is responsible for kfree_skb on error.

Thanks to Alexey Dobryan, who originally found the problem.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Denis V. Lunev 2007-12-21 02:01:53 -08:00 committed by David S. Miller
parent 1ac70e7ad2
commit d883a03671
1 changed files with 6 additions and 3 deletions
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9
net/ipv4/fib_frontend.c
View File

@ -804,10 +804,13 @@ static void nl_fib_input(struct sk_buff *skb)
nlh = nlmsg_hdr(skb); nlh = nlmsg_hdr(skb);
if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len ||
nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) { nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn)))
kfree_skb(skb);
return; return;
}
skb = skb_clone(skb, GFP_KERNEL);
if (skb == NULL)
return;
nlh = nlmsg_hdr(skb);
frn = (struct fib_result_nl *) NLMSG_DATA(nlh); frn = (struct fib_result_nl *) NLMSG_DATA(nlh);
tb = fib_get_table(frn->tb_id_in); tb = fib_get_table(frn->tb_id_in);