netdev - [Patch net] can: initialize skbcnt in j1939_tp_tx_dat

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Message-Id: <20201008061821.24663-1-xiyou.wangcong@gmail.com>
Date:   Wed,  7 Oct 2020 23:18:21 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     netdev@...r.kernel.org
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        syzbot+3f3837e61a48d32b495f@...kaller.appspotmail.com,
        Robin van der Gracht <robin@...tonic.nl>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [Patch net] can: initialize skbcnt in j1939_tp_tx_dat_new()

This fixes an uninit-value warning:
BUG: KMSAN: uninit-value in can_receive+0x26b/0x630 net/can/af_can.c:650

Reported-and-tested-by: syzbot+3f3837e61a48d32b495f@...kaller.appspotmail.com
Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")
Cc: Robin van der Gracht <robin@...tonic.nl>
Cc: Oleksij Rempel <linux@...pel-privat.de>
Cc: Pengutronix Kernel Team <kernel@...gutronix.de>
Cc: Oliver Hartkopp <socketcan@...tkopp.net>
Cc: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
---
 net/can/j1939/transport.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/can/j1939/transport.c b/net/can/j1939/transport.c
index 0cec4152f979..88cf1062e1e9 100644
--- a/net/can/j1939/transport.c
+++ b/net/can/j1939/transport.c
@@ -580,6 +580,7 @@ sk_buff *j1939_tp_tx_dat_new(struct j1939_priv *priv,
 	skb->dev = priv->ndev;
 	can_skb_reserve(skb);
 	can_skb_prv(skb)->ifindex = priv->ndev->ifindex;
+	can_skb_prv(skb)->skbcnt = 0;
 	/* reserve CAN header */
 	skb_reserve(skb, offsetof(struct can_frame, data));
 
-- 
2.28.0