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[NETLINK]: Fix processing of fib_lookup netlink messages 

The receive path for fib_lookup netlink messages is lacking sanity
checks for header and payload and is thus vulnerable to malformed
netlink messages causing illegal memory references.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf 2005-12-01 14:30:00 -08:00 committed by David S. Miller
parent 2a43c4af3f
commit ea86575eaf
1 changed files with 6 additions and 2 deletions
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8
net/ipv4/fib_frontend.c
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@ -544,12 +544,16 @@ static void nl_fib_input(struct sock *sk, int len)
struct sk_buff *skb = NULL;
struct nlmsghdr *nlh = NULL;
struct fib_result_nl *frn;
int err;
u32 pid;
struct fib_table *tb;
skb = skb_recv_datagram(sk, 0, 0, &err);
skb = skb_dequeue(&sk->sk_receive_queue);
nlh = (struct nlmsghdr *)skb->data;
if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len ||
nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) {
kfree_skb(skb);
return;
}
frn = (struct fib_result_nl *) NLMSG_DATA(nlh);
tb = fib_get_table(frn->tb_id_in);