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[PATCH] 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: Greg Kroah-Hartman <gregkh@suse.de>
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6ca4c553e6
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1 changed files with 6 additions and 2 deletions
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@ -545,12 +545,16 @@ static void nl_fib_input(struct sock *sk, int len)
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struct sk_buff *skb = NULL;
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struct nlmsghdr *nlh = NULL;
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struct fib_result_nl *frn;
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int err;
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u32 pid;
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struct fib_table *tb;
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skb = skb_recv_datagram(sk, 0, 0, &err);
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skb = skb_dequeue(&sk->sk_receive_queue);
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nlh = (struct nlmsghdr *)skb->data;
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if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len ||
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nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) {
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kfree_skb(skb);
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return;
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}
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frn = (struct fib_result_nl *) NLMSG_DATA(nlh);
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tb = fib_get_table(frn->tb_id_in);
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