media: dvb-core: Fix use-after-free due on race condition at dvb_net

mainline inclusion
from mainline-v6.4-rc3
commit 4172385b
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I635JD
CVE: CVE-2022-45886

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=4172385b0c9ac366dcab78eda48c26814b87ed1a

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A race condition may occur between the .disconnect function, which
is called when the device is disconnected, and the dvb_device_open()
function, which is called when the device node is open()ed.
This results in several types of UAFs.

The root cause of this is that you use the dvb_device_open() function,
which does not implement a conditional statement
that checks 'dvbnet->exit'.

So, add 'remove_mutex` to protect 'dvbnet->exit' and use
locked_dvb_net_open() function to check 'dvbnet->exit'.

[mchehab: fix a checkpatch warning]

Link: https://lore.kernel.org/linux-media/20221117045925.14297-3-imv4bel@gmail.com


Signed-off-by: Hyunwoo Kim <imv4bel@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Cai Xinchen <caixinchen1@huawei.com>