[PATCH 08/39] drm/amd/display: Fix possible overflow in integer multiplication

[Rodrigo Siqueira]

From: Alex Hung <alex.hung at amd.com>

[WHAT & HOW]
Integer multiplies integer may overflow in context that expects an
expression of unsigned long long (64 bits). This can be fixed by casting
integer to unsigned long long to force 64 bits results.

This fixes 2 OVERFLOW_BEFORE_WIDEN issues reported by Coverity.

Signed-off-by: Alex Hung <alex.hung at amd.com>
Reviewed-by: Rodrigo Siqueira <rodrigo.siqueira at amd.com>
Signed-off-by: Rodrigo Siqueira <rodrigo.siqueira at amd.com>
---
 .../amd/display/dc/resource/dcn32/dcn32_resource_helpers.c    | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource_helpers.c b/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource_helpers.c
index 47c8a9fbe754..f5a4e97c40ce 100644
--- a/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource_helpers.c
+++ b/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource_helpers.c
@@ -663,7 +663,7 @@ bool dcn32_subvp_drr_admissable(struct dc *dc, struct dc_state *context)
 
 				subvp_disallow |= disallow_subvp_in_active_plus_blank(pipe);
 				refresh_rate = (pipe->stream->timing.pix_clk_100hz * (uint64_t)100 +
-					pipe->stream->timing.v_total * pipe->stream->timing.h_total - (uint64_t)1);
+					pipe->stream->timing.v_total * (unsigned long long)pipe->stream->timing.h_total - (uint64_t)1);
 				refresh_rate = div_u64(refresh_rate, pipe->stream->timing.v_total);
 				refresh_rate = div_u64(refresh_rate, pipe->stream->timing.h_total);
 			}
@@ -724,7 +724,7 @@ bool dcn32_subvp_vblank_admissable(struct dc *dc, struct dc_state *context, int
 
 				subvp_disallow |= disallow_subvp_in_active_plus_blank(pipe);
 				refresh_rate = (pipe->stream->timing.pix_clk_100hz * (uint64_t)100 +
-					pipe->stream->timing.v_total * pipe->stream->timing.h_total - (uint64_t)1);
+					pipe->stream->timing.v_total * (unsigned long long)pipe->stream->timing.h_total - (uint64_t)1);
 				refresh_rate = div_u64(refresh_rate, pipe->stream->timing.v_total);
 				refresh_rate = div_u64(refresh_rate, pipe->stream->timing.h_total);
 			}
-- 
2.43.0