linux-kernel - [PATCH] drm/amd/dc/dce120: Fix audio register mapping, stop triggering KASAN

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Date:   Mon, 14 Nov 2022 17:20:45 -0500
From:   Lyude Paul <lyude@...hat.com>
To:     amd-gfx@...ts.freedesktop.org
Cc:     stable@...r.kernel.org, Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Alan Liu <HaoPing.Liu@....com>,
        Aurabindo Pillai <aurabindo.pillai@....com>,
        dri-devel@...ts.freedesktop.org (open list:DRM DRIVERS),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] drm/amd/dc/dce120: Fix audio register mapping, stop triggering KASAN

There's been a very long running bug that seems to have been neglected for
a while, where amdgpu consistently triggers a KASAN error at start:

  BUG: KASAN: global-out-of-bounds in read_indirect_azalia_reg+0x1d4/0x2a0 [amdgpu]
  Read of size 4 at addr ffffffffc2274b28 by task modprobe/1889

After digging through amd's rather creative method for accessing registers,
I eventually discovered the problem likely has to do with the fact that on
my dce120 GPU there are supposedly 7 sets of audio registers. But we only
define a register mapping for 6 sets.

So, fix this and fix the KASAN warning finally.

Signed-off-by: Lyude Paul <lyude@...hat.com>
Cc: stable@...r.kernel.org
---
Sending this one separately from the rest of my fixes since:

* It's definitely completely unrelated to the Gitlab 2171 issue
* I'm not sure if this is the correct fix since it's in DC

 drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c b/drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c
index 1b70b78e2fa15..af631085e88c5 100644
--- a/drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c
@@ -359,7 +359,8 @@ static const struct dce_audio_registers audio_regs[] = {
 	audio_regs(2),
 	audio_regs(3),
 	audio_regs(4),
-	audio_regs(5)
+	audio_regs(5),
+	audio_regs(6),
 };
 
 #define DCE120_AUD_COMMON_MASK_SH_LIST(mask_sh)\
-- 
2.37.3