linux-kernel - Re: [PATCH] io_uring: fix file leak on creating io ctx

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Message-ID: <3466437a-0325-1cb8-6aa9-594527382390@kernel.dk>
Date:   Mon, 7 Dec 2020 09:42:21 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Hillf Danton <hdanton@...a.com>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     io-uring@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        syzbot+71c4697e27c99fddcf17@...kaller.appspotmail.com,
        Pavel Begunkov <asml.silence@...il.com>
Subject: Re: [PATCH] io_uring: fix file leak on creating io ctx

On 12/7/20 1:15 AM, Hillf Danton wrote:
> @@ -9207,12 +9208,14 @@ err_fd:
>  #if defined(CONFIG_UNIX)
>  	ctx->ring_sock->file = file;
>  #endif
> -	if (unlikely(io_uring_add_task_file(ctx, file))) {
> -		file = ERR_PTR(-ENOMEM);
> -		goto err_fd;
> +	ret = io_uring_add_task_file(ctx, file);
> +	if (ret) {
> +		fput(file);
> +		put_unused_fd(fd);
> +		goto err;
>  	}
>  	fd_install(ret, file);
> -	return ret;
> +	return 0;

You're installing the return value from io_uring_add_task_file() in the
fd table, and then returning '0' for the fd...

-- 
Jens Axboe