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can: af_can: Fix error path of can_init()

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[ Upstream commit c5a3aed1cd3152429348ee1fe5cdcca65fe901ce ]

This patch add error path for can_init() to avoid possible crash if some
error occurs.

Fixes: 0d66548a10 ("[CAN]: Add PF_CAN core module")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
YueHaibing 2019-05-16 22:36:26 +08:00 committed by Greg Kroah-Hartman
parent 486954277f
commit 473a75c7fa
1 changed files with 21 additions and 3 deletions
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24
net/can/af_can.c
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@ -959,6 +959,8 @@ static struct pernet_operations can_pernet_ops __read_mostly = {
static __init int can_init(void)
{
int err;
/* check for correct padding to be able to use the structs similarly */
BUILD_BUG_ON(offsetof(struct can_frame, can_dlc) !=
offsetof(struct canfd_frame, len) ||
@ -972,15 +974,31 @@ static __init int can_init(void)
if (!rcv_cache)
return -ENOMEM;
register_pernet_subsys(&can_pernet_ops);
err = register_pernet_subsys(&can_pernet_ops);
if (err)
goto out_pernet;
/* protocol register */
sock_register(&can_family_ops);
register_netdevice_notifier(&can_netdev_notifier);
err = sock_register(&can_family_ops);
if (err)
goto out_sock;
err = register_netdevice_notifier(&can_netdev_notifier);
if (err)
goto out_notifier;
dev_add_pack(&can_packet);
dev_add_pack(&canfd_packet);
return 0;
out_notifier:
sock_unregister(PF_CAN);
out_sock:
unregister_pernet_subsys(&can_pernet_ops);
out_pernet:
kmem_cache_destroy(rcv_cache);
return err;
}
static __exit void can_exit(void)