linux-kernel - Re: [PATCH v2 4/5] io_uring: Fix missing save the current thread files

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Message-ID: <6f19c032-4b49-8eca-c264-be6f23751f70@kernel.dk>
Date:   Tue, 6 Oct 2020 14:26:17 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Muchun Song <songmuchun@...edance.com>, viro@...iv.linux.org.uk
Cc:     linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, zhuyinyin@...edance.com
Subject: Re: [PATCH v2 4/5] io_uring: Fix missing save the current thread
 files

On 9/23/20 5:44 AM, Muchun Song wrote:
> We forget to save the current thread files, in this case, we can not
> send SIGINT signal to the kworker because the files is not equal.
> 
> Fixes: 54ee77961e79 ("io_uring: Fix NULL pointer dereference in io_sq_wq_submit_work()")
> Signed-off-by: Muchun Song <songmuchun@...edance.com>
> ---
>  fs/io_uring.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/fs/io_uring.c b/fs/io_uring.c
> index 12e68ea00a543..c65f78f395655 100644
> --- a/fs/io_uring.c
> +++ b/fs/io_uring.c
> @@ -2391,6 +2391,8 @@ static bool io_add_to_prev_work(struct async_list *list, struct io_kiocb *req)
>  	if (ret) {
>  		struct io_ring_ctx *ctx = req->ctx;
>  
> +		req->files = current->files;
> +
>  		spin_lock_irq(&ctx->task_lock);
>  		list_add(&req->task_list, &ctx->task_list);
>  		req->work_task = NULL;

This should be folded in with patch 1.

-- 
Jens Axboe