Commit 6b64c944 authored by Eric Dumazet's avatar Eric Dumazet Committed by Kamal Mostafa

tcp: fix NULL deref in tcp_v4_send_ack()

commit e62a123b upstream.

Neal reported crashes with this stack trace :

 RIP: 0010:[<ffffffff8c57231b>] tcp_v4_send_ack+0x41/0x20f
...
 CR2: 0000000000000018 CR3: 000000044005c000 CR4: 00000000001427e0
...
  [<ffffffff8c57258e>] tcp_v4_reqsk_send_ack+0xa5/0xb4
  [<ffffffff8c1a7caa>] tcp_check_req+0x2ea/0x3e0
  [<ffffffff8c19e420>] tcp_rcv_state_process+0x850/0x2500
  [<ffffffff8c1a6d21>] tcp_v4_do_rcv+0x141/0x330
  [<ffffffff8c56cdb2>] sk_backlog_rcv+0x21/0x30
  [<ffffffff8c098bbd>] tcp_recvmsg+0x75d/0xf90
  [<ffffffff8c0a8700>] inet_recvmsg+0x80/0xa0
  [<ffffffff8c17623e>] sock_aio_read+0xee/0x110
  [<ffffffff8c066fcf>] do_sync_read+0x6f/0xa0
  [<ffffffff8c0673a1>] SyS_read+0x1e1/0x290
  [<ffffffff8c5ca262>] system_call_fastpath+0x16/0x1b

The problem here is the skb we provide to tcp_v4_send_ack() had to
be parked in the backlog of a new TCP fastopen child because this child
was owned by the user at the time an out of window packet arrived.

Before queuing a packet, TCP has to set skb->dev to NULL as the device
could disappear before packet is removed from the queue.

Fix this issue by using the net pointer provided by the socket (being a
timewait or a request socket).

IPv6 is immune to the bug : tcp_v6_send_response() already gets the net
pointer from the socket if provided.

Fixes: 168a8f58 ("tcp: TCP Fast Open Server - main code path")
Reported-by: default avatarNeal Cardwell <ncardwell@google.com>
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Cc: Jerry Chu <hkchu@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Acked-by: default avatarNeal Cardwell <ncardwell@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
Signed-off-by: default avatarKamal Mostafa <kamal@canonical.com>
parent 331a39c5
...@@ -710,7 +710,8 @@ static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb) ...@@ -710,7 +710,8 @@ static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb)
outside socket context is ugly, certainly. What can I do? outside socket context is ugly, certainly. What can I do?
*/ */
static void tcp_v4_send_ack(struct sk_buff *skb, u32 seq, u32 ack, static void tcp_v4_send_ack(struct net *net,
struct sk_buff *skb, u32 seq, u32 ack,
u32 win, u32 tsval, u32 tsecr, int oif, u32 win, u32 tsval, u32 tsecr, int oif,
struct tcp_md5sig_key *key, struct tcp_md5sig_key *key,
int reply_flags, u8 tos) int reply_flags, u8 tos)
...@@ -725,7 +726,6 @@ static void tcp_v4_send_ack(struct sk_buff *skb, u32 seq, u32 ack, ...@@ -725,7 +726,6 @@ static void tcp_v4_send_ack(struct sk_buff *skb, u32 seq, u32 ack,
]; ];
} rep; } rep;
struct ip_reply_arg arg; struct ip_reply_arg arg;
struct net *net = dev_net(skb_dst(skb)->dev);
memset(&rep.th, 0, sizeof(struct tcphdr)); memset(&rep.th, 0, sizeof(struct tcphdr));
memset(&arg, 0, sizeof(arg)); memset(&arg, 0, sizeof(arg));
...@@ -786,7 +786,8 @@ static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb) ...@@ -786,7 +786,8 @@ static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb)
struct inet_timewait_sock *tw = inet_twsk(sk); struct inet_timewait_sock *tw = inet_twsk(sk);
struct tcp_timewait_sock *tcptw = tcp_twsk(sk); struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
tcp_v4_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, tcp_v4_send_ack(sock_net(sk), skb,
tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
tcp_time_stamp + tcptw->tw_ts_offset, tcp_time_stamp + tcptw->tw_ts_offset,
tcptw->tw_ts_recent, tcptw->tw_ts_recent,
...@@ -805,8 +806,10 @@ static void tcp_v4_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, ...@@ -805,8 +806,10 @@ static void tcp_v4_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
/* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV
* sk->sk_state == TCP_SYN_RECV -> for Fast Open. * sk->sk_state == TCP_SYN_RECV -> for Fast Open.
*/ */
tcp_v4_send_ack(skb, (sk->sk_state == TCP_LISTEN) ? u32 seq = (sk->sk_state == TCP_LISTEN) ? tcp_rsk(req)->snt_isn + 1 :
tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt, tcp_sk(sk)->snd_nxt;
tcp_v4_send_ack(sock_net(sk), skb, seq,
tcp_rsk(req)->rcv_nxt, req->rcv_wnd, tcp_rsk(req)->rcv_nxt, req->rcv_wnd,
tcp_time_stamp, tcp_time_stamp,
req->ts_recent, req->ts_recent,
......
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