drm/amd/display: fix shift-out-of-bounds in CalculateVMAndRowBytes

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[ Upstream commit 031f196d1b ]

[WHY]
When PTEBufferSizeInRequests is zero, UBSAN reports the following
warning because dml_log2 returns an unexpected negative value:

  shift exponent 4294966273 is too large for 32-bit type 'int'

[HOW]

In the case PTEBufferSizeInRequests is zero, skip the dml_log2() and
assign the result directly.

Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Alex Hung 2023-01-11 09:54:11 -07:00 • committed by Greg Kroah-Hartman

parent 55a7c647eb

commit e12b956808

1 changed files with 4 additions and 1 deletions

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drivers/gpu/drm/amd/display/dc/dml/dcn30/display_mode_vba_30.c

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