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authorEric Dumazet <edumazet@google.com>2017-09-08 22:44:47 +0300
committerDavid S. Miller <davem@davemloft.net>2017-09-09 02:07:17 +0300
commit1f3b359f1004bd34b7b0bad70b93e3c7af92a37b (patch)
tree40485d37c352b90d936c2c95239ea9d4e7d2f140 /net
parent108074611015bccfaf9ef50710edfd6929e55cd3 (diff)
downloadlinux-1f3b359f1004bd34b7b0bad70b93e3c7af92a37b.tar.xz
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: d624d276d1dd ("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>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/tcp_ipv4.c6
-rw-r--r--net/ipv6/tcp_ipv6.c6
2 files changed, 6 insertions, 6 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index a63486afa7a7..d9416b5162bc 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1669,9 +1669,9 @@ 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;
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 38f76d8b231e..64d94afa427f 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1460,9 +1460,9 @@ 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;