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tcp: fix a request socket leak 

While the cited commit fixed a possible deadlock, it added a leak
of the request socket, since reqsk_put() must be called if the BPF
filter decided the ACK packet must be dropped.

Fixes: d624d276d1 ("tcp: fix possible deadlock in TCP stack vs BPF filter")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2017-09-08 12:44:47 -07:00 committed by David S. Miller
parent 1080746110
commit 1f3b359f10
2 changed files with 6 additions and 6 deletions
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6
net/ipv4/tcp_ipv4.c
View File

@ -1669,9 +1669,9 @@ 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);
nsk = NULL;
if (!tcp_filter(sk, skb))
nsk = tcp_check_req(sk, skb, req, false);
if (!nsk) {
reqsk_put(req);
goto discard_and_relse;

6
net/ipv6/tcp_ipv6.c
View File

@ -1460,9 +1460,9 @@ 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);
nsk = NULL;
if (!tcp_filter(sk, skb))
nsk = tcp_check_req(sk, skb, req, false);
if (!nsk) {
reqsk_put(req);
goto discard_and_relse;