linux-kernel - Re: [PATCH][next] io_uring: fix missing error return when percpu_ref

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Message-ID: <cf270359-fd06-3175-d0ef-ec2adc628235@canonical.com>
Date:   Fri, 20 Dec 2019 23:49:49 +0000
From:   Colin Ian King <colin.king@...onical.com>
To:     Jens Axboe <axboe@...nel.dk>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        io-uring@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] io_uring: fix missing error return when
 percpu_ref_init fails

On 20/12/2019 23:48, Jens Axboe wrote:
> On 12/20/19 4:33 PM, Colin King wrote:
>> From: Colin Ian King <colin.king@...onical.com>
>>
>> Currently when the call to percpu_ref_init fails ctx->file_data is
>> set to null and because there is a missing return statement the
>> following statement dereferences this null pointer causing an oops.
>> Fix this by adding the missing -ENOMEM return to avoid the oops.
> 
> Nice, thanks! I'm guessing I didn't have the necessary magic debug
> options to allow failure injection for failing.

Fortunately we have Coverity to the rescue :-)

Colin