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can: j1935: j1939_tp_tx_dat_new(): fix missing initialization of skbcnt 

[ Upstream commit e009f95b15 ]

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@syzkaller.appspotmail.com
Fixes: 9d71dd0c70 ("can: add support of SAE J1939 protocol")
Cc: Robin van der Gracht <robin@protonic.nl>
Cc: Oleksij Rempel <linux@rempel-privat.de>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: Oliver Hartkopp <socketcan@hartkopp.net>
Cc: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Link: https://lore.kernel.org/r/20201008061821.24663-1-xiyou.wangcong@gmail.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Cong Wang 2020-10-07 23:18:21 -07:00 committed by Greg Kroah-Hartman
parent b0342b87ca
commit 25bd9ea1ae
1 changed files with 1 additions and 0 deletions
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1
net/can/j1939/transport.c
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@ -580,6 +580,7 @@ sk_buff *j1939_tp_tx_dat_new(struct j1939_priv *priv,
skb->dev = priv->ndev; skb->dev = priv->ndev;
can_skb_reserve(skb); can_skb_reserve(skb);
can_skb_prv(skb)->ifindex = priv->ndev->ifindex; can_skb_prv(skb)->ifindex = priv->ndev->ifindex;
can_skb_prv(skb)->skbcnt = 0;
/* reserve CAN header */ /* reserve CAN header */
skb_reserve(skb, offsetof(struct can_frame, data)); skb_reserve(skb, offsetof(struct can_frame, data));