linux-kernel - Re: [PATCH] btrfs: compression: Adjust cb->compressed

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Message-ID: <20250428150241.GC7139@twin.jikos.cz>
Date: Mon, 28 Apr 2025 17:02:41 +0200
From: David Sterba <dsterba@...e.cz>
To: Kees Cook <kees@...nel.org>
Cc: Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
	David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] btrfs: compression: Adjust cb->compressed_folios
 allocation type

On Fri, Apr 25, 2025 at 11:23:29PM -0700, Kees Cook wrote:
> In preparation for making the kmalloc family of allocators type aware,
> we need to make sure that the returned type from the allocation matches
> the type of the variable being assigned. (Before, the allocator would
> always return "void *", which can be implicitly cast to any pointer type.)
> 
> The assigned type is "struct folio **" but the returned type will be
> "struct page **". These are the same allocation size (pointer size), but
> the types don't match. Adjust the allocation type to match the assignment.
> 
> Signed-off-by: Kees Cook <kees@...nel.org>

Added to for-next, thanks.