netdev - Re: [PATCH net] net: devlink: fix UAF in devlink_compat_running

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Date:   Mon, 28 Nov 2022 11:01:45 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Yang Yingliang <yangyingliang@...wei.com>
Cc:     netdev@...r.kernel.org, jiri@...dia.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Subject: Re: [PATCH net] net: devlink: fix UAF in
 devlink_compat_running_version()

Tue, Nov 22, 2022 at 01:10:48PM CET, yangyingliang@...wei.com wrote:

[...]


>
>Fixes: a62fdbbe9403 ("netdevsim: implement ndo_get_devlink_port")
>Reported-by: Zhengchao Shao <shaozhengchao@...wei.com>
>Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
>---
> net/core/devlink.c | 3 +++
> 1 file changed, 3 insertions(+)
>
>diff --git a/net/core/devlink.c b/net/core/devlink.c
>index 89baa7c0938b..6453ac0558fb 100644
>--- a/net/core/devlink.c
>+++ b/net/core/devlink.c
>@@ -250,6 +250,9 @@ void devlink_put(struct devlink *devlink)
> 
> struct devlink *__must_check devlink_try_get(struct devlink *devlink)
> {
>+	 if (!xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED))

        ^
You have an extra space here. Checkpatch would warn you.


>+		return NULL;
>+
> 	if (refcount_inc_not_zero(&devlink->refcount))
> 		return devlink;
> 	return NULL;
>-- 
>2.25.1
>