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authorFrank van der Linden <fllinden@amazon.com>2018-06-12 23:09:37 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-06-26 08:08:07 +0800
commit6caca347e4b007a645aa6b8bb950fa27b5e221d5 (patch)
treef286ab695e0769cc8942cb68732686ea1faddf7e
parent2d34743a2c90361efc91ce626eda2af91f96727d (diff)
tcp: verify the checksum of the first data segment in a new connection
[ Upstream commit 4fd44a98ffe0d048246efef67ed640fdf2098a62 ] commit 079096f103fa ("tcp/dccp: install syn_recv requests into ehash table") introduced an optimization for the handling of child sockets created for a new TCP connection. But this optimization passes any data associated with the last ACK of the connection handshake up the stack without verifying its checksum, because it calls tcp_child_process(), which in turn calls tcp_rcv_state_process() directly. These lower-level processing functions do not do any checksum verification. Insert a tcp_checksum_complete call in the TCP_NEW_SYN_RECEIVE path to fix this. Fixes: 079096f103fa ("tcp/dccp: install syn_recv requests into ehash table") Signed-off-by: Frank van der Linden <fllinden@amazon.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Tested-by: Balbir Singh <bsingharora@gmail.com> Reviewed-by: Balbir Singh <bsingharora@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--net/ipv4/tcp_ipv4.c4
-rw-r--r--net/ipv6/tcp_ipv6.c4
2 files changed, 8 insertions, 0 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index b3960738464e..504cdae41013 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1661,6 +1661,10 @@ process:
reqsk_put(req);
goto discard_it;
}
+ if (tcp_checksum_complete(skb)) {
+ reqsk_put(req);
+ goto csum_error;
+ }
if (unlikely(sk->sk_state != TCP_LISTEN)) {
inet_csk_reqsk_queue_drop_and_put(sk, req);
goto lookup;
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index eb624547382f..0a69d39880f2 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1433,6 +1433,10 @@ process:
reqsk_put(req);
goto discard_it;
}
+ if (tcp_checksum_complete(skb)) {
+ reqsk_put(req);
+ goto csum_error;
+ }
if (unlikely(sk->sk_state != TCP_LISTEN)) {
inet_csk_reqsk_queue_drop_and_put(sk, req);
goto lookup;