[PATCH net] tcp: fix possible deadlock in TCP stack vs BPF filter

[Eric Dumazet]

From: Eric Dumazet <eduma...@google.com>

Filtering the ACK packet was not put at the right place.

At this place, we already allocated a child and put it
into accept queue.

We absolutely need to call tcp_child_process() to release
its spinlock, or we will deadlock at accept() or close() time.

Found by syzkaller team (Thanks a lot !)

Fixes: 8fac365f63c8 ("tcp: Add a tcp_filter hook before handle ack packet")
Signed-off-by: Eric Dumazet <eduma...@google.com>
Reported-by: Dmitry Vyukov <dvyu...@google.com>
Cc: Chenbo Feng <fe...@google.com>
---
 net/ipv4/tcp_ipv4.c |    4 ++--
 net/ipv6/tcp_ipv6.c |    4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index a20e7f03d5f7..e9252c7df809 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1722,6 +1722,8 @@ int tcp_v4_rcv(struct sk_buff *skb)
                 */
                sock_hold(sk);
                refcounted = true;
+               if (tcp_filter(sk, skb))
+                       goto discard_and_relse;
                nsk = tcp_check_req(sk, skb, req, false);
                if (!nsk) {
                        reqsk_put(req);
@@ -1729,8 +1731,6 @@ int tcp_v4_rcv(struct sk_buff *skb)
                }
                if (nsk == sk) {
                        reqsk_put(req);
-               } else if (tcp_filter(sk, skb)) {
-                       goto discard_and_relse;
                } else if (tcp_child_process(sk, nsk, skb)) {
                        tcp_v4_send_reset(nsk, skb);
                        goto discard_and_relse;
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 2521690d62d6..206210125fd7 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1456,6 +1456,8 @@ static int tcp_v6_rcv(struct sk_buff *skb)
                }
                sock_hold(sk);
                refcounted = true;
+               if (tcp_filter(sk, skb))
+                       goto discard_and_relse;
                nsk = tcp_check_req(sk, skb, req, false);
                if (!nsk) {
                        reqsk_put(req);
@@ -1464,8 +1466,6 @@ static int tcp_v6_rcv(struct sk_buff *skb)
                if (nsk == sk) {
                        reqsk_put(req);
                        tcp_v6_restore_cb(skb);
-               } else if (tcp_filter(sk, skb)) {
-                       goto discard_and_relse;
                } else if (tcp_child_process(sk, nsk, skb)) {
                        tcp_v6_send_reset(nsk, skb);
                        goto discard_and_relse;