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Date: Mon, 18 Sep 2017 11:09:38 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>, Alexei Starovoitov <ast@...nel.org>, "David S. Miller" <davem@...emloft.net> Subject: [PATCH 4.13 10/52] tcp: fix a request socket leak 4.13-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet <edumazet@...gle.com> [ Upstream commit 1f3b359f1004bd34b7b0bad70b93e3c7af92a37b ] 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: d624d276d1dd ("tcp: fix possible deadlock in TCP stack vs BPF filter") Signed-off-by: Eric Dumazet <edumazet@...gle.com> Acked-by: Alexei Starovoitov <ast@...nel.org> Signed-off-by: David S. Miller <davem@...emloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- net/ipv4/tcp_ipv4.c | 6 +++--- net/ipv6/tcp_ipv6.c | 6 +++--- 2 files changed, 6 insertions(+), 6 deletions(-) --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -1722,9 +1722,9 @@ process: */ 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; --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -1456,9 +1456,9 @@ process: } 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;
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