From: Jiri Pirko <jiri@resnulli.us>
To: Jia-Ju Bai <baijiaju1990@gmail.com>
Cc: jhs@mojatatu.com, xiyou.wangcong@gmail.com, davem@davemloft.net,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] net: sched: Fix a possible null-pointer dereference in dequeue_func()
Date: Mon, 29 Jul 2019 09:41:25 +0200 [thread overview]
Message-ID: <20190729074125.GB2211@nanopsycho> (raw)
In-Reply-To: <4752bf67-7a0c-7bc9-3d54-f18361085ba2@gmail.com>
Mon, Jul 29, 2019 at 09:32:00AM CEST, baijiaju1990@gmail.com wrote:
>
>
>On 2019/7/29 14:56, Jiri Pirko wrote:
>> Mon, Jul 29, 2019 at 04:21:57AM CEST, baijiaju1990@gmail.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.
>> >
>> > Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
>> Fixes tag, please?
>
>Sorry, I do not know what "fixes tag" means...
>I just find a possible bug and fix it in this patch.
git log |grep Fixes:
If A fix goes to -net tree, it most probably fixes some bug introduced
by some commit in the past. So this tag is to put a reference.
>
>
>Best wishes,
>Jia-Ju Bai
next prev parent reply other threads:[~2019-07-29 7:41 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-29 2:21 [PATCH] net: sched: Fix a possible null-pointer dereference in dequeue_func() Jia-Ju Bai
2019-07-29 6:56 ` Jiri Pirko
2019-07-29 7:32 ` Jia-Ju Bai
2019-07-29 7:41 ` Jiri Pirko [this message]
2019-07-29 7:59 ` Jia-Ju Bai
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