netdev - [PATCH] net: diag: Fix refcnt leak in error path destroying socket

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1472011527-16760-1-git-send-email-dsa@cumulusnetworks.com>
Date:   Tue, 23 Aug 2016 21:05:27 -0700
From:   David Ahern <dsa@...ulusnetworks.com>
To:     netdev@...r.kernel.org, lorenzo@...gle.com
Cc:     eric.dumazet@...il.com, David Ahern <dsa@...ulusnetworks.com>
Subject: [PATCH] net: diag: Fix refcnt leak in error path destroying socket

inet_diag_find_one_icsk takes a reference to a socket that is not
released if sock_diag_destroy returns an error. Fix by changing
tcp_diag_destroy to manage the refcnt for all cases and remove
the sock_put calls from tcp_abort.

Fixes: c1e64e298b8ca ("net: diag: Support destroying TCP sockets")
Reported-by: Lorenzo Colitti <lorenzo@...gle.com>
Signed-off-by: David Ahern <dsa@...ulusnetworks.com>
---
 net/ipv4/tcp.c      | 2 --
 net/ipv4/tcp_diag.c | 7 ++++++-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index f1a9a0a8a1f3..54c5d0a8f6e9 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3176,7 +3176,6 @@ int tcp_abort(struct sock *sk, int err)
 			local_bh_enable();
 			return 0;
 		}
-		sock_gen_put(sk);
 		return -EOPNOTSUPP;
 	}
 
@@ -3205,7 +3204,6 @@ int tcp_abort(struct sock *sk, int err)
 	bh_unlock_sock(sk);
 	local_bh_enable();
 	release_sock(sk);
-	sock_put(sk);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(tcp_abort);
diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c
index 4d610934fb39..a748c74aa8b7 100644
--- a/net/ipv4/tcp_diag.c
+++ b/net/ipv4/tcp_diag.c
@@ -54,11 +54,16 @@ static int tcp_diag_destroy(struct sk_buff *in_skb,
 {
 	struct net *net = sock_net(in_skb->sk);
 	struct sock *sk = inet_diag_find_one_icsk(net, &tcp_hashinfo, req);
+	int err;
 
 	if (IS_ERR(sk))
 		return PTR_ERR(sk);
 
-	return sock_diag_destroy(sk, ECONNABORTED);
+	err = sock_diag_destroy(sk, ECONNABORTED);
+
+	sock_gen_put(sk);
+
+	return err;
 }
 #endif
 
-- 
2.1.4