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

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Message-ID: <a1a36f72-50ff-9cce-bcde-6639f7ab6406@kernel.dk>
Date:   Fri, 20 Dec 2019 16:50:50 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Colin Ian King <colin.king@...onical.com>,
        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 12/20/19 4:49 PM, Colin Ian King wrote:
> 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 :-)

Indeed!

-- 
Jens Axboe