can: pch_can: pch_can_rx_normal: fix use after free

mainline inclusion
from mainline-v5.16-rc5
commit 94cddf1e
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9S211
CVE: CVE-2021-47520

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=94cddf1e9227a171b27292509d59691819c458db

--------------------------------

After calling netif_receive_skb(skb), dereferencing skb is unsafe.
Especially, the can_frame cf which aliases skb memory is dereferenced
just after the call netif_receive_skb(skb).

Reordering the lines solves the issue.

Fixes: b21d18b5 ("can: Topcliff: Add PCH_CAN driver.")
Link: https://lore.kernel.org/all/20211123111654.621610-1-mailhol.vincent@wanadoo.fr


Cc: stable@vger.kernel.org
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Signed-off-by: Luo Gengkun <luogengkun2@huawei.com>