From: Jia-Ju Bai <baijiaju1990@gmail.com>
To: Jiri Pirko <jiri@resnulli.us>
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 15:32:00 +0800 [thread overview]
Message-ID: <4752bf67-7a0c-7bc9-3d54-f18361085ba2@gmail.com> (raw)
In-Reply-To: <20190729065653.GA2211@nanopsycho>
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.
Best wishes,
Jia-Ju Bai
next prev parent reply other threads:[~2019-07-29 7:32 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-29 2:21 Jia-Ju Bai
2019-07-29 6:56 ` Jiri Pirko
2019-07-29 7:32 ` Jia-Ju Bai [this message]
2019-07-29 7:41 ` Jiri Pirko
2019-07-29 7:59 ` Jia-Ju Bai
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