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Bluetooth: cmtp: fix possible panic when cmtp_init_sockets() fails

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[ Upstream commit 2a7ca7459d905febf519163bd9e3eed894de6bb7 ]

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: 1da177e4c3 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Wang Hai 2021-10-25 21:10:12 +08:00 committed by Greg Kroah-Hartman
parent 9ddfa1c191
commit 88f1b613c3
1 changed files with 1 additions and 3 deletions
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4
net/bluetooth/cmtp/core.c
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@ -501,9 +501,7 @@ static int __init cmtp_init(void)
{
BT_INFO("CMTP (CAPI Emulation) ver %s", VERSION);
cmtp_init_sockets();
return 0;
return cmtp_init_sockets();
}
static void __exit cmtp_exit(void)