From f2d51b20d747e027e81ab3c3f24a6c833ada3fb3 Mon Sep 17 00:00:00 2001 From: "Gustavo A. R. Silva" Date: Wed, 10 Feb 2021 15:23:30 -0600 Subject: [PATCH] drm/amd/display: Fix potential integer overflow Fix potential integer overflow by casting actual_calculated_clock_100hz to u64, in order to give the compiler complete information about the proper arithmetic to use. Notice that such variable is used in a context that expects an expression of type u64 (64 bits, unsigned) and the following expression is currently being evaluated using 32-bit arithmetic: actual_calculated_clock_100hz * post_divider Fixes: 7a03fdf628af ("drm/amd/display: fix 64bit division issue on 32bit OS") Addresses-Coverity-ID: 1501691 ("Unintentional integer overflow") Signed-off-by: Gustavo A. R. Silva Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c b/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c index bc942725b9d8..dec58b3c42e4 100644 --- a/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c @@ -240,7 +240,7 @@ static bool calc_fb_divider_checking_tolerance( pll_settings->calculated_pix_clk_100hz = actual_calculated_clock_100hz; pll_settings->vco_freq = - div_u64(actual_calculated_clock_100hz * post_divider, 10); + div_u64((u64)actual_calculated_clock_100hz * post_divider, 10); return true; } return false; -- 2.11.0