Re: [PATCH 1/2] pipe: fix potential use-after-free in pipe_read()

[Leizhen (ThunderTown)]

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.

> .
>