linux-kernel - [RFC PATCH 0/1] drm/amdgpu: Fix NULL-deref in amdgpu_device_fini

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Message-Id: <20220930214110.1074226-1-zhangboyang.id@gmail.com>
Date:   Sat,  1 Oct 2022 05:41:09 +0800
From:   Zhang Boyang <zhangboyang.id@...il.com>
To:     Andrey Grodzovsky <andrey.grodzovsky@....com>,
        Christian König <christian.koenig@....com>,
        linux-kernel@...r.kernel.org, amd-gfx@...ts.freedesktop.org
Cc:     "David C . Rankin" <drankinatty@...denlinkmail.com>,
        Steven J Abner <pheonix.sja@....net>
Subject: [RFC PATCH 0/1] drm/amdgpu: Fix NULL-deref in amdgpu_device_fini_sw()

Hi,

There are several reports of "Fatal error during GPU init" will cause
NULL-deref in amdgpu_device_fini_sw(). Although the NULL-deref is result
instead of reason, this NULL-deref will confuse user.

https://lore.kernel.org/lkml/a8bce489-8ccc-aa95-3de6-f854e03ad557@suddenlinkmail.com/
https://lore.kernel.org/lkml/AT9WHR.3Z1T3VI9A2AQ3@att.net/

This is probably because "adev" is not fully initialized when
amdgpu_device_init() failed. Thus subsequent amdgpu_device_fini_sw()
will try to release "adev->reset_domain" and cause NULL-deref.

This patch fixes this problem by guarding the code with an "if".
However, I'm new to this module and I didn't fully understand the code,
so please review my code carefully.

Best Regards,
Zhang Boyang