linux-kernel - Re: [PATCH] io_uring: fix uninitialized return

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Date:   Mon, 7 Feb 2022 12:09:24 -0800
From:   Tom Rix <trix@...hat.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     axboe@...nel.dk, asml.silence@...il.com, nathan@...nel.org,
        usama.arif@...edance.com, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] io_uring: fix uninitialized return


On 2/7/22 11:48 AM, Nick Desaulniers wrote:
> On Mon, Feb 7, 2022 at 10:51 AM <trix@...hat.com> wrote:
>> From: Tom Rix <trix@...hat.com>
>>
>> The clang build fails with this error
>> io_uring.c:9396:9: error: variable 'ret' is uninitialized when used here
>>          return ret;
>>                 ^~~~
>> Return 0 directly.
>>
>> Fixes: b77e315a9644 ("io_uring: avoid ring quiesce while registering/unregistering eventfd")
>> Signed-off-by: Tom Rix <trix@...hat.com>
> Thanks for the patch:
> See also:
> https://lore.kernel.org/llvm/20220207162410.1013466-1-nathan@kernel.org/

No worries as long as it gets fixed.

Tom

>
>> ---
>>   fs/io_uring.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/fs/io_uring.c b/fs/io_uring.c
>> index aadabb31d6da7..74afb96af214c 100644
>> --- a/fs/io_uring.c
>> +++ b/fs/io_uring.c
>> @@ -9393,7 +9393,7 @@ static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg,
>>          ev_fd->eventfd_async = eventfd_async;
>>
>>          rcu_assign_pointer(ctx->io_ev_fd, ev_fd);
>> -       return ret;
>> +       return 0;
>>   }
>>
>>   static void io_eventfd_put(struct rcu_head *rcu)
>> --
>> 2.26.3
>>
>