drm/amd/display: Explicitly extend unsigned 16 bit to 64 bit

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Coverity reports sign extention defects as below:

Suspicious implicit sign extension: mode->htotal with type u16 ... to
int (32 bits, signed), then sign-extended to type unsigned long
(64 bits, unsigned). If mode->htotal * mode->vtotal is greater than
0x7FFFFFFF, the upper bits of the result will all be 1.

Cast it to unsigned long to avoid possible overflow.

This fixes 4 SIGN_EXTENSION issues reported by Coverity.

Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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Alex Hung 2024-06-05 12:37:18 -06:00 • committed by Alex Deucher

parent 0057b36ac2

commit 143818fae0

1 changed files with 2 additions and 2 deletions

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drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

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