linux-kernel - RE: [PATCH v2 1/2] EDAC/igen6: Fix NULL pointer dereference

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Message-ID: <SJ1PR11MB6083A3234879FED2522B0148FC72A@SJ1PR11MB6083.namprd11.prod.outlook.com>
Date: Wed, 18 Jun 2025 17:46:23 +0000
From: "Luck, Tony" <tony.luck@...el.com>
To: "Zhuo, Qiuxu" <qiuxu.zhuo@...el.com>, "bp@...en8.de" <bp@...en8.de>
CC: "james.morse@....com" <james.morse@....com>, "linux-edac@...r.kernel.org"
	<linux-edac@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "marmarek@...isiblethingslab.com"
	<marmarek@...isiblethingslab.com>, "mchehab@...nel.org" <mchehab@...nel.org>,
	"rric@...nel.org" <rric@...nel.org>
Subject: RE: [PATCH v2 1/2] EDAC/igen6: Fix NULL pointer dereference

> This issue occurred because one memory controller was disabled by
> the BIOS but the igen6_edac driver still checked all the memory
> controllers, including this absent one, to identify the source of
> the error. Accessing the null MMIO for the absent memory controller
> resulted in the oops above.
>
> Fix this issue by reverting the configuration structure to non-const
> and updating the field 'res_cfg->num_imc' to reflect the number of
> detected memory controllers.
>
> Fixes: 20e190b1c1fd ("EDAC/igen6: Skip absent memory controllers")
> Reported-by: Marek Marczykowski-Górecki <marmarek@...isiblethingslab.com>
> Closes: https://lore.kernel.org/all/aFFN7RlXkaK_loQb@mail-itl/
> Suggested-by: Borislav Petkov <bp@...en8.de>
> Tested-by: Marek Marczykowski-Górecki <marmarek@...isiblethingslab.com>
> Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@...el.com>

Applied (both this and patch 2/2) to RAS edac-drivers branch.

Thanks

-Tony