linux-kernel - Re: [PATCH 1/2] pipe: fix potential use-after-free in pipe

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Message-ID: <d604e5f8-128a-d25c-848d-7380a5bde609@huawei.com>
Date:   Mon, 15 Nov 2021 14:13:44 +0800
From:   "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
To:     Matthew Wilcox <willy@...radead.org>
CC:     Alexander Viro <viro@...iv.linux.org.uk>,
        David Howells <dhowells@...hat.com>,
        <linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] pipe: fix potential use-after-free in pipe_read()



On 2021/11/15 12:25, Matthew Wilcox wrote:
> On Mon, Nov 15, 2021 at 11:57:20AM +0800, Zhen Lei wrote:
>>  			if (!buf->len) {
>> +				unsigned int __maybe_unused flags = buf->flags;
> 
> Why __maybe_unused?

It's used only if "#ifdef CONFIG_WATCH_QUEUE". Otherwise, a warning will be reported.

> .
>