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Date:   Thu, 4 Mar 2021 15:56:47 +0530
From:   Ritesh Harjani <>
Subject: Re: [PATCH] iomap: Fix negative assignment to unsigned sis->pages in

On 3/4/21 11:51 AM, Ritesh Harjani wrote:
> In case if isi.nr_pages is 0, we are making sis->pages (which is
> unsigned int) a huge value in iomap_swapfile_activate() by assigning -1.
> This could cause a kernel crash in kernel v4.18 (with below signature).
> Or could lead to unknown issues on latest kernel if the fake big swap gets
> used.
> Fix this issue by returning -EINVAL in case of nr_pages is 0, since it
> is anyway a invalid swapfile. Looks like this issue will be hit when
> we have pagesize < blocksize type of configuration.

Oops I meant blocksize < pagesize type of configuration.

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