linux-kernel - Re: [PATCH] io_uring: fix iovec leaks

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Message-ID: <e9e28cfb-fad0-ea23-48e0-461c10acccc5@kernel.dk>
Date:   Fri, 7 Feb 2020 13:40:47 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Pavel Begunkov <asml.silence@...il.com>, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] io_uring: fix iovec leaks

On 2/7/20 12:09 PM, Pavel Begunkov wrote:
> On 07/02/2020 22:04, Pavel Begunkov wrote:
>> Allocated iovec is freed only in io_{read,write,send,recv)(), and just
>> leaves it if an error occured. There are plenty of such cases:
>> - cancellation of non-head requests
>> - fail grabbing files in __io_queue_sqe()
>> - set REQ_F_NOWAIT and returning in __io_queue_sqe()
>> - etc.
>>
>> Add REQ_F_NEED_CLEANUP, which will force such requests with custom
>> allocated resourses go through cleanup handlers on put.
> 
> This is probably desirable in stable-5.5, so I tried to not change much.
> I'll hide common parts in following patches for-5.6/next.

I appreciate that, it's worth keeping in mind for stable bound patches
for sure. Thanks, applied.

-- 
Jens Axboe