From bbd0d1c942cbac87404ed2bca0aa4f7907b8f47f Mon Sep 17 00:00:00 2001
From: Alex Hung <alex.hung@amd.com>
Date: Fri, 7 Jun 2024 22:09:53 -0600
Subject: drm/amd/display: Fix possible overflow in integer multiplication
[WHAT & HOW]
Integer multiplies integer may overflow in context that expects an
expression of unsigned/siged long long (64 bits). This can be fixed
by casting integer to unsigned/siged long long to force 64 bits results.
This fixes 26 OVERFLOW_BEFORE_WIDEN issues reported by Coverity.
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Jerry Zuo <jerry.zuo@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>
---
drivers/gpu/drm/amd/display/modules/freesync/freesync.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
(limited to 'drivers/gpu/drm/amd/display/modules')
diff --git a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
index d09627c15b9c..a40e6590215a 100644
--- a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
+++ b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
@@ -1002,7 +1002,7 @@ void mod_freesync_build_vrr_params(struct mod_freesync *mod_freesync,
if (stream->ctx->dc->caps.max_v_total != 0 && stream->timing.h_total != 0) {
min_hardware_refresh_in_uhz = div64_u64((stream->timing.pix_clk_100hz * 100000000ULL),
- (stream->timing.h_total * stream->ctx->dc->caps.max_v_total));
+ (stream->timing.h_total * (long long)stream->ctx->dc->caps.max_v_total));
}
/* Limit minimum refresh rate to what can be supported by hardware */
min_refresh_in_uhz = min_hardware_refresh_in_uhz > in_config->min_refresh_in_uhz ?
--
cgit v1.2.3