linux-kernel - Re: [PATCH][next] io_uring: Fix uninitialized variable up.resv

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Date:   Mon, 26 Apr 2021 11:01:47 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     Pavel Begunkov <asml.silence@...il.com>,
        Jens Axboe <axboe@...nel.dk>, io-uring@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] io_uring: Fix uninitialized variable up.resv

On 26/04/2021 10:59, Pavel Begunkov wrote:
> On 4/26/21 10:47 AM, Colin King wrote:
>> From: Colin Ian King <colin.king@...onical.com>
>>
>> The variable up.resv is not initialized and is being checking for a
>> non-zero value in the call to _io_register_rsrc_update. Fix this by
>> explicitly setting the pointer to 0.

                          ^^ s/pointer/variable/

Shall I send a V2?

> 
> LGTM, thanks Colin
> 
> 
>> Addresses-Coverity: ("Uninitialized scalar variable)"
>> Fixes: c3bdad027183 ("io_uring: add generic rsrc update with tags")
>> Signed-off-by: Colin Ian King <colin.king@...onical.com>
>> ---
>>  fs/io_uring.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/fs/io_uring.c b/fs/io_uring.c
>> index f4ec092c23f4..63f610ee274b 100644
>> --- a/fs/io_uring.c
>> +++ b/fs/io_uring.c
>> @@ -5842,6 +5842,7 @@ static int io_files_update(struct io_kiocb *req, unsigned int issue_flags)
>>  	up.data = req->rsrc_update.arg;
>>  	up.nr = 0;
>>  	up.tags = 0;
>> +	up.resv = 0;
>>  
>>  	mutex_lock(&ctx->uring_lock);
>>  	ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE,
>>
>