* [PATCH] Bluetooth: Fix not cleanup led when bt_init fails
@ 2022-11-29 9:25 Chen Zhongjin
2022-12-02 21:25 ` patchwork-bot+bluetooth
0 siblings, 1 reply; 2+ messages in thread
From: Chen Zhongjin @ 2022-11-29 9:25 UTC (permalink / raw)
To: linux-bluetooth, netdev, linux-kernel
Cc: chenzhongjin, marcel, johan.hedberg, luiz.dentz, davem, edumazet,
kuba, pabeni
bt_init() calls bt_leds_init() to register led, but if it fails later,
bt_leds_cleanup() is not called to unregister it.
This can cause panic if the argument "bluetooth-power" in text is freed
and then another led_trigger_register() tries to access it:
BUG: unable to handle page fault for address: ffffffffc06d3bc0
RIP: 0010:strcmp+0xc/0x30
Call Trace:
<TASK>
led_trigger_register+0x10d/0x4f0
led_trigger_register_simple+0x7d/0x100
bt_init+0x39/0xf7 [bluetooth]
do_one_initcall+0xd0/0x4e0
Fixes: e64c97b53bc6 ("Bluetooth: Add combined LED trigger for controller power")
Signed-off-by: Chen Zhongjin <chenzhongjin@huawei.com>
---
net/bluetooth/af_bluetooth.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/net/bluetooth/af_bluetooth.c b/net/bluetooth/af_bluetooth.c
index dc65974f5adb..1c3c7ff5c3c6 100644
--- a/net/bluetooth/af_bluetooth.c
+++ b/net/bluetooth/af_bluetooth.c
@@ -737,7 +737,7 @@ static int __init bt_init(void)
err = bt_sysfs_init();
if (err < 0)
- return err;
+ goto cleanup_led;
err = sock_register(&bt_sock_family_ops);
if (err)
@@ -773,6 +773,8 @@ static int __init bt_init(void)
sock_unregister(PF_BLUETOOTH);
cleanup_sysfs:
bt_sysfs_cleanup();
+cleanup_led:
+ bt_leds_cleanup();
return err;
}
--
2.17.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] Bluetooth: Fix not cleanup led when bt_init fails
2022-11-29 9:25 [PATCH] Bluetooth: Fix not cleanup led when bt_init fails Chen Zhongjin
@ 2022-12-02 21:25 ` patchwork-bot+bluetooth
0 siblings, 0 replies; 2+ messages in thread
From: patchwork-bot+bluetooth @ 2022-12-02 21:25 UTC (permalink / raw)
To: Chen Zhongjin
Cc: linux-bluetooth, netdev, linux-kernel, marcel, johan.hedberg,
luiz.dentz, davem, edumazet, kuba, pabeni
Hello:
This patch was applied to bluetooth/bluetooth-next.git (master)
by Luiz Augusto von Dentz <luiz.von.dentz@intel.com>:
On Tue, 29 Nov 2022 17:25:56 +0800 you wrote:
> bt_init() calls bt_leds_init() to register led, but if it fails later,
> bt_leds_cleanup() is not called to unregister it.
>
> This can cause panic if the argument "bluetooth-power" in text is freed
> and then another led_trigger_register() tries to access it:
>
> BUG: unable to handle page fault for address: ffffffffc06d3bc0
> RIP: 0010:strcmp+0xc/0x30
> Call Trace:
> <TASK>
> led_trigger_register+0x10d/0x4f0
> led_trigger_register_simple+0x7d/0x100
> bt_init+0x39/0xf7 [bluetooth]
> do_one_initcall+0xd0/0x4e0
>
> [...]
Here is the summary with links:
- Bluetooth: Fix not cleanup led when bt_init fails
https://git.kernel.org/bluetooth/bluetooth-next/c/63d70ae785a9
You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
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^ permalink raw reply [flat|nested] 2+ messages in thread
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