linux-kernel - Re: [PATCH][next] ACPI: APEI: EINJ: Fix check and iounmap of uninitialized pointer p

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Message-ID: <31b6548f-8ff7-4bc5-8a2c-78a5a9d5eb40@suswa.mountain>
Date: Wed, 25 Jun 2025 00:31:10 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Colin Ian King <colin.i.king@...il.com>
Cc: "Rafael J . Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>,
	James Morse <james.morse@....com>, Tony Luck <tony.luck@...el.com>,
	Borislav Petkov <bp@...en8.de>, Ira Weiny <ira.weiny@...el.com>,
	linux-acpi@...r.kernel.org, kernel-janitors@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] ACPI: APEI: EINJ: Fix check and iounmap of
 uninitialized pointer p

On Tue, Jun 24, 2025 at 09:29:37PM +0100, Colin Ian King wrote:
> In the case where a request_mem_region call fails and pointer r is null
> the error exit path via label 'out' will check for a non-null pointer
> p and try to iounmap it. However, pointer p has not been assigned a
> value at this point, so it may potentially contain any garbage value.
> Fix this by ensuring pointer p is initialized to NULL.
> 
> Fixes: 1a35c88302a3 ("ACPI: APEI: EINJ: Fix kernel test sparse warnings")
> Signed-off-by: Colin Ian King <colin.i.king@...il.com>
> ---

Good catch.  Apparently this isn't in my allyesconfig.  It's weird the
zero day bot didn't catch this either.

regards,
dan carpenter