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drm/amd/dc/dce120: Fix audio register mapping, stop triggering KASAN

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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@redhat.com>
Cc: stable@vger.kernel.org
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lyude Paul 2022-11-14 17:20:45 -05:00 • committed by Greg Kroah-Hartman
commit d4e9bab771
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c
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@ -340,7 +340,8 @@ 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)\