diff options
| author | Thomas Graf <tgraf@suug.ch> | 2005-12-01 14:30:00 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2005-12-01 14:30:00 -0800 |
| commit | ea86575eaf99a9262a969309d934318028dbfacb (patch) | |
| tree | d2d0418160460265ba61defa81bfbd870dce813e /net/ipv4/fib_frontend.c | |
| parent | 2a43c4af3fa2e701008d51c28365e26fccf9cbb0 (diff) | |
| download | lwn-ea86575eaf99a9262a969309d934318028dbfacb.tar.gz lwn-ea86575eaf99a9262a969309d934318028dbfacb.zip | |
[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>
Diffstat (limited to 'net/ipv4/fib_frontend.c')
| -rw-r--r-- | net/ipv4/fib_frontend.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c index 882f88f6d13b..19b1b984d687 100644 --- a/net/ipv4/fib_frontend.c +++ b/net/ipv4/fib_frontend.c @@ -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); |