diff options
| author | Patrick McHardy <kaber@trash.net> | 2006-11-28 20:10:21 -0800 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-11-28 20:59:38 -0800 |
| commit | af443b6d90de17f7630621269cf0610d9d772670 (patch) | |
| tree | bd329577450b1d152813117d47796c65a45b39d4 | |
| parent | 2e47c264a2e6ea24c27b4987607222202818c1f4 (diff) | |
| download | linux-af443b6d90de17f7630621269cf0610d9d772670.tar.gz linux-af443b6d90de17f7630621269cf0610d9d772670.tar.bz2 linux-af443b6d90de17f7630621269cf0610d9d772670.zip | |
[NETFILTER]: ipt_REJECT: fix memory corruption
On devices with hard_header_len > LL_MAX_HEADER ip_route_me_harder()
reallocates the skb, leading to memory corruption when using the stale
tcph pointer to update the checksum.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/netfilter/ipt_REJECT.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/net/ipv4/netfilter/ipt_REJECT.c b/net/ipv4/netfilter/ipt_REJECT.c index ad0312d0e4fd..264763adc39b 100644 --- a/net/ipv4/netfilter/ipt_REJECT.c +++ b/net/ipv4/netfilter/ipt_REJECT.c @@ -114,6 +114,14 @@ static void send_reset(struct sk_buff *oldskb, int hook) tcph->window = 0; tcph->urg_ptr = 0; + /* Adjust TCP checksum */ + tcph->check = 0; + tcph->check = tcp_v4_check(tcph, sizeof(struct tcphdr), + nskb->nh.iph->saddr, + nskb->nh.iph->daddr, + csum_partial((char *)tcph, + sizeof(struct tcphdr), 0)); + /* Set DF, id = 0 */ nskb->nh.iph->frag_off = htons(IP_DF); nskb->nh.iph->id = 0; @@ -129,14 +137,8 @@ static void send_reset(struct sk_buff *oldskb, int hook) if (ip_route_me_harder(&nskb, addr_type)) goto free_nskb; - /* Adjust TCP checksum */ nskb->ip_summed = CHECKSUM_NONE; - tcph->check = 0; - tcph->check = tcp_v4_check(tcph, sizeof(struct tcphdr), - nskb->nh.iph->saddr, - nskb->nh.iph->daddr, - csum_partial((char *)tcph, - sizeof(struct tcphdr), 0)); + /* Adjust IP TTL */ nskb->nh.iph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT); |