nfc/nci: fix race with opening and closing

stable inclusion
from stable-v5.10.157
commit 398a860a44297245ed4cb7ff59b37fef89c379f8
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7MU59

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=398a860a44297245ed4cb7ff59b37fef89c379f8



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[ Upstream commit 0ad6bded ]

Previously we leverage NCI_UNREG and the lock inside nci_close_device to
prevent the race condition between opening a device and closing a
device. However, it still has problem because a failed opening command
will erase the NCI_UNREG flag and allow another opening command to
bypass the status checking.

This fix corrects that by making sure the NCI_UNREG is held.

Reported-by:  <syzbot+43475bf3cfbd6e41f5b7@syzkaller.appspotmail.com>
Fixes: 48b71a9e ("NFC: add NCI_UNREG flag to eliminate the race")
Signed-off-by: Lin Ma <linma@zju.edu.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>