netdev - Re: [PATCH v3] net: sched: Fix a possible null-pointer dereference in dequeue

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Date:   Mon, 29 Jul 2019 10:42:28 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jia-Ju Bai <baijiaju1990@...il.com>
Cc:     jhs@...atatu.com, xiyou.wangcong@...il.com, davem@...emloft.net,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] net: sched: Fix a possible null-pointer dereference
 in dequeue_func()

Mon, Jul 29, 2019 at 10:24:33AM CEST, baijiaju1990@...il.com wrote:
>In dequeue_func(), there is an if statement on line 74 to check whether
>skb is NULL:
>    if (skb)
>
>When skb is NULL, it is used on line 77:
>    prefetch(&skb->end);
>
>Thus, a possible null-pointer dereference may occur.
>
>To fix this bug, skb->end is used when skb is not NULL.
>
>This bug is found by a static analysis tool STCheck written by us.
>
>Fixes: 76e3cc126bb2 ("codel: Controlled Delay AQM")
>Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>

Reviewed-by: Jiri Pirko <jiri@...lanox.com>