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From:   Colin King <colin.king@canonical.com>
To:     Robin van der Gracht <robin@protonic.nl>,
        Oleksij Rempel <linux@rempel-privat.de>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Oliver Hartkopp <socketcan@hartkopp.net>,
        Marc Kleine-Budde <mkl@pengutronix.de>,
        "David S . Miller" <davem@davemloft.net>,
        linux-can@vger.kernel.org, netdev@vger.kernel.org
Cc:     kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH][next] can: fix resource leak of skb on error return paths
Date:   Wed, 18 Sep 2019 11:11:56 +0100
Message-Id: <20190918101156.24370-1-colin.king@canonical.com>
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Sender: linux-kernel-owner@vger.kernel.org
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From: Colin Ian King <colin.king@canonical.com>

Currently the error return paths do not free skb and this results
in a memory leak. Fix this by freeing them before the return.

Addresses-Coverity: ("Resource leak")
Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 net/can/j1939/socket.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/net/can/j1939/socket.c b/net/can/j1939/socket.c
index 37c1040bcb9c..5c6eabcb5df1 100644
--- a/net/can/j1939/socket.c
+++ b/net/can/j1939/socket.c
@@ -909,8 +909,10 @@ void j1939_sk_errqueue(struct j1939_session *session,
 	memset(serr, 0, sizeof(*serr));
 	switch (type) {
 	case J1939_ERRQUEUE_ACK:
-		if (!(sk->sk_tsflags & SOF_TIMESTAMPING_TX_ACK))
+		if (!(sk->sk_tsflags & SOF_TIMESTAMPING_TX_ACK)) {
+			kfree_skb(skb);
 			return;
+		}
 
 		serr->ee.ee_errno = ENOMSG;
 		serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING;
@@ -918,8 +920,10 @@ void j1939_sk_errqueue(struct j1939_session *session,
 		state = "ACK";
 		break;
 	case J1939_ERRQUEUE_SCHED:
-		if (!(sk->sk_tsflags & SOF_TIMESTAMPING_TX_SCHED))
+		if (!(sk->sk_tsflags & SOF_TIMESTAMPING_TX_SCHED)) {
+			kfree_skb(skb);
 			return;
+		}
 
 		serr->ee.ee_errno = ENOMSG;
 		serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING;
-- 
2.20.1