This is a note to let you know that I've just added the patch titled
drm/amd/dc/dce120: Fix audio register mapping, stop triggering KASAN
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-amd-dc-dce120-fix-audio-register-mapping-stop-triggering-kasan.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 44035ec2fde1114254ee465f9ba3bb246b0b6283 Mon Sep 17 00:00:00 2001
From: Lyude Paul <lyude@xxxxxxxxxx>
Date: Mon, 14 Nov 2022 17:20:45 -0500
Subject: drm/amd/dc/dce120: Fix audio register mapping, stop triggering KASAN
From: Lyude Paul <lyude@xxxxxxxxxx>
commit 44035ec2fde1114254ee465f9ba3bb246b0b6283 upstream.
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@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c
@@ -340,7 +340,8 @@ static const struct dce_audio_registers
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)\
Patches currently in stable-queue which might be from lyude@xxxxxxxxxx are
queue-5.4/drm-amd-dc-dce120-fix-audio-register-mapping-stop-triggering-kasan.patch
