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Date: Fri, 22 Oct 2021 16:43:59 +0800 From: "wanghai (M)" <wanghai38@...wei.com> To: Marcel Holtmann <marcel@...tmann.org> CC: Karsten Keil <isdn@...ux-pingi.de>, Johan Hedberg <johan.hedberg@...il.com>, Luiz Augusto von Dentz <luiz.dentz@...il.com>, "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, Thadeu Lima de Souza Cascardo <cascardo@...onical.com>, "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>, <linux-bluetooth@...r.kernel.org>, <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] Bluetooth: cmtp: fix possible panic when cmtp_init_sockets() fails 在 2021/10/22 12:48, Marcel Holtmann 写道: > Hi Wang, > >> 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@...wei.com> >> Signed-off-by: Wang Hai <wanghai38@...wei.com> >> --- >> net/bluetooth/cmtp/core.c | 6 ++++-- >> 1 file changed, 4 insertions(+), 2 deletions(-) >> >> diff --git a/net/bluetooth/cmtp/core.c b/net/bluetooth/cmtp/core.c >> index 0a2d78e811cf..ccf48f50afdf 100644 >> --- a/net/bluetooth/cmtp/core.c >> +++ b/net/bluetooth/cmtp/core.c >> @@ -499,11 +499,13 @@ int cmtp_get_conninfo(struct cmtp_conninfo *ci) >> >> static int __init cmtp_init(void) >> { >> + int err; >> + >> BT_INFO("CMTP (CAPI Emulation) ver %s", VERSION); >> >> - cmtp_init_sockets(); >> + err = cmtp_init_sockets(); >> >> - return 0; >> + return err; >> } > just do return cmtp_init_sockets(); > > Regards > > Marcel Ok, I will send v2 > . > -- Wang Hai
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