linux-kernel - Re: [syzbot] WARNING in iomap

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Message-ID: <YwOWiDKhVxm7m0fa@casper.infradead.org>
Date:   Mon, 22 Aug 2022 15:45:28 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Siddh Raman Pant <code@...dh.me>
Cc:     david@...morbit.com, djwong@...nel.org, fgheet255t@...il.com,
        hch@...radead.org, linux-ext4@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-xfs@...r.kernel.org, riteshh@...ux.ibm.com,
        syzbot+a8e049cd3abd342936b6@...kaller.appspotmail.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] WARNING in iomap_iter

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.