Re: [syzbot] WARNING in iomap_iter

[Matthew Wilcox <willy@xxxxxxxxxxxxx>]

On Sun, Aug 21, 2022 at 05:18:16PM +0530, Siddh Raman Pant wrote:
> @@ -979,9 +979,15 @@ loop_set_status_from_info(struct loop_device *lo,
>  
>  	lo->lo_offset = info->lo_offset;
>  	lo->lo_sizelimit = info->lo_sizelimit;
> +	lo->lo_flags = info->lo_flags;
> +
> +	/* loff_t/int vars are assigned __u64/__u32 vars (respectively) */
> +	if (lo->lo_offset < 0 || lo->lo_sizelimit < 0 || lo->lo_flags < 0)
> +		return -EOVERFLOW;

Why would you check lo_flags?  That really, really should be an unsigned
type.