linux-kernel - Re: [PATCH v2] vfs: Adjust indentation in remap_verify

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Date:   Wed, 18 Dec 2019 12:04:37 +0100
From:   David Sterba <dsterba@...e.cz>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Al Viro <viro@...iv.linux.org.uk>, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH v2] vfs: Adjust indentation in remap_verify_area

On Tue, Dec 17, 2019 at 10:16:35PM -0700, Nathan Chancellor wrote:
> Clang's -Wmisleading-indentation caught an instance in remap_verify_area
> where there was a trailing space after a tab. Remove it to get rid of
> the warning.
> 
> Fixes: 04b38d601239 ("vfs: pull btrfs clone API to vfs layer")
> Link: https://github.com/ClangBuiltLinux/linux/issues/828
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> ---
> 
> v1 -> v2:
> 
> * Trim warning and simplify patch explanation.
> 
>  fs/read_write.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/read_write.c b/fs/read_write.c
> index 5bbf587f5bc1..c71e863163bd 100644
> --- a/fs/read_write.c
> +++ b/fs/read_write.c
> @@ -1757,7 +1757,7 @@ static int remap_verify_area(struct file *file, loff_t pos, loff_t len,
>  	if (unlikely(pos < 0 || len < 0))
>  		return -EINVAL;
>  
> -	 if (unlikely((loff_t) (pos + len) < 0))
> +	if (unlikely((loff_t) (pos + len) < 0))

Instead of just fixing whitespace, can we please fix the undefined
behaviour on this line? pos and len are signed types, there's a helper
to do that in a way that's UB-safe.

And btw here's a patch:

https://lore.kernel.org/linux-fsdevel/20190808123942.19592-1-dsterba@suse.com/