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bridge: ignore bogus STP config packets 

If the message_age is already greater than the max_age, then the
BPDU is bogus. Linux won't generate BPDU, but conformance tester
or buggy implementation might.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger 2011-07-22 07:47:07 +00:00 committed by David S. Miller
parent 0c03150e7e
commit 0652cac22c
1 changed files with 11 additions and 0 deletions
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11
net/bridge/br_stp_bpdu.c
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@ -210,6 +210,17 @@ void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
bpdu.hello_time = br_get_ticks(buf+28);
bpdu.forward_delay = br_get_ticks(buf+30);
if (bpdu.message_age > bpdu.max_age) {
if (net_ratelimit())
br_notice(p->br,
"port %u config from %pM"
" (message_age %ul > max_age %ul)\n",
p->port_no,
eth_hdr(skb)->h_source,
bpdu.message_age, bpdu.max_age);
goto out;
}
br_received_config_bpdu(p, &bpdu);
}