[PATCH 5.8 021/633] can: j1935: j1939_tp_tx_dat_new(): fix missing initialization of skbcnt

[Greg Kroah-Hartman]

From: Cong Wang <xiyou.wangc...@gmail.com>

[ Upstream commit e009f95b1543e26606dca2f7e6e9f0f9174538e5 ]

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+3f3837e61a48d32b4...@syzkaller.appspotmail.com
Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")
Cc: Robin van der Gracht <ro...@protonic.nl>
Cc: Oleksij Rempel <li...@rempel-privat.de>
Cc: Pengutronix Kernel Team <ker...@pengutronix.de>
Cc: Oliver Hartkopp <socket...@hartkopp.net>
Cc: Marc Kleine-Budde <m...@pengutronix.de>
Signed-off-by: Cong Wang <xiyou.wangc...@gmail.com>
Link: https://lore.kernel.org/r/20201008061821.24663-1-xiyou.wangc...@gmail.com
Signed-off-by: Marc Kleine-Budde <m...@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 net/can/j1939/transport.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/can/j1939/transport.c
+++ b/net/can/j1939/transport.c
@@ -580,6 +580,7 @@ sk_buff *j1939_tp_tx_dat_new(struct j193
        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));