linux-kernel - Re: [LKP] Re: [pipe] d60337eff1: BUG:kernel_NULL_pointer

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Message-ID: <35daca93-ff2b-2c7d-b837-72396ca0677a@intel.com>
Date:   Mon, 18 Nov 2019 15:53:22 +0800
From:   kernel test robot <rong.a.chen@...el.com>
To:     David Howells <dhowells@...hat.com>,
        kernel test robot <lkp@...el.com>
Cc:     torvalds@...ux-foundation.org,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        nicolas.dichtel@...nd.com, raven@...maw.net,
        Christian Brauner <christian@...uner.io>,
        keyrings@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-block@...r.kernel.org, linux-security-module@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-api@...r.kernel.org,
        linux-kernel@...r.kernel.org, lkp@...ts.01.org
Subject: Re: [LKP] Re: [pipe] d60337eff1:
 BUG:kernel_NULL_pointer_dereference,address

Hi David,

Yes, it can fix the problem.

Best Regards,
Rong Chen

On 11/16/2019 12:22 AM, David Howells wrote:
> Actually, no, this is the fix:
>
> diff --git a/lib/iov_iter.c b/lib/iov_iter.c
> index 7006b5b2106d..be2fc5793ddd 100644
> --- a/lib/iov_iter.c
> +++ b/lib/iov_iter.c
> @@ -537,7 +537,7 @@ static size_t push_pipe(struct iov_iter *i, size_t size,
>   		buf->ops = &default_pipe_buf_ops;
>   		buf->page = page;
>   		buf->offset = 0;
> -		buf->len = max_t(ssize_t, left, PAGE_SIZE);
> +		buf->len = min_t(ssize_t, left, PAGE_SIZE);
>   		left -= buf->len;
>   		iter_head++;
>   		pipe->head = iter_head;
>
> David
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