diff options
Diffstat (limited to 'net/ipv4/tcp_ipv4.c')
| -rw-r--r-- | net/ipv4/tcp_ipv4.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 1660613ddae4..3845ab04a9b4 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -1585,6 +1585,12 @@ int tcp_v4_rcv(struct sk_buff *skb) if (!pskb_may_pull(skb, th->doff * 4)) goto discard_it; + /* Assuming a trustworthy entity did the checksum and found the csum + * invalid, drop the packet. + */ + if (skb->ip_summed == CHECKSUM_COMPLETE && skb->csum_valid == 0) + goto csum_error; + /* An explanation is required here, I think. * Packet length and doff are validated by header prediction, * provided case of th->doff==0 is eliminated. |