linux-kernel - [PATCH 1/8] l2tp: Correctly return -EBADF from pppol2tp

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Date:   Thu,  2 Apr 2020 18:32:43 +0100
From:   Will Deacon <will@...nel.org>
To:     gregkh@...uxfoundation.org
Cc:     stable@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...roid.com, g.nault@...halink.fr,
        "phil.turnbull@...cle.com" <phil.turnbull@...cle.com>,
        "David S . Miller" <davem@...emloft.net>,
        Will Deacon <will@...nel.org>
Subject: [PATCH 1/8] l2tp: Correctly return -EBADF from pppol2tp_getname.

From: "phil.turnbull@...cle.com" <phil.turnbull@...cle.com>

commit 4ac36a4adaf80013a60013d6f829f5863d5d0e05 upstream.

If 'tunnel' is NULL we should return -EBADF but the 'end_put_sess' path
unconditionally sets 'error' back to zero. Rework the error path so it
more closely matches pppol2tp_sendmsg.

Fixes: fd558d186df2 ("l2tp: Split pppol2tp patch into separate l2tp and ppp parts")
Signed-off-by: Phil Turnbull <phil.turnbull@...cle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Will Deacon <will@...nel.org>
---
 net/l2tp/l2tp_ppp.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c
index d3f1222c1a8c..bc5fca07d2ee 100644
--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c
@@ -889,10 +889,8 @@ static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
 
 	pls = l2tp_session_priv(session);
 	tunnel = l2tp_sock_to_tunnel(pls->tunnel_sock);
-	if (tunnel == NULL) {
-		error = -EBADF;
+	if (tunnel == NULL)
 		goto end_put_sess;
-	}
 
 	inet = inet_sk(tunnel->sock);
 	if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) {
@@ -970,12 +968,11 @@ static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
 	}
 
 	*usockaddr_len = len;
+	error = 0;
 
 	sock_put(pls->tunnel_sock);
 end_put_sess:
 	sock_put(sk);
-	error = 0;
-
 end:
 	return error;
 }
-- 
2.26.0.rc2.310.g2932bb562d-goog