Bluetooth: cmtp: fix possible panic when cmtp_init_sockets() fails
authorWang Hai <wanghai38@huawei.com>
Mon, 25 Oct 2021 13:10:12 +0000 (21:10 +0800)
committerMarcel Holtmann <marcel@holtmann.org>
Mon, 25 Oct 2021 13:02:04 +0000 (15:02 +0200)
commit2a7ca7459d905febf519163bd9e3eed894de6bb7
tree026c4121e9bde2f3419d41134e8a78622503767c
parentf33b0068cdaf2b9998fa3662585858ef30bc4b9e
Bluetooth: cmtp: fix possible panic when cmtp_init_sockets() fails

I got a kernel BUG report when doing fault injection test:

------------[ cut here ]------------
kernel BUG at lib/list_debug.c:45!
...
RIP: 0010:__list_del_entry_valid.cold+0x12/0x4d
...
Call Trace:
 proto_unregister+0x83/0x220
 cmtp_cleanup_sockets+0x37/0x40 [cmtp]
 cmtp_exit+0xe/0x1f [cmtp]
 do_syscall_64+0x35/0xb0
 entry_SYSCALL_64_after_hwframe+0x44/0xae

If cmtp_init_sockets() in cmtp_init() fails, cmtp_init() still returns
success. This will cause a kernel bug when accessing uncreated ctmp
related data when the module exits.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wang Hai <wanghai38@huawei.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
net/bluetooth/cmtp/core.c