From c550b60c647941b581e4b0f4f2b1526b34f4a8e5 Mon Sep 17 00:00:00 2001 From: "Gustavo A. R. Silva" Date: Sun, 11 Aug 2019 19:08:01 -0500 Subject: [PATCH] drm/komeda: Fix potential integer overflow in komeda_crtc_update_clock_ratio Add suffix ULL to constant 1000 in order to avoid a potential integer overflow and give the compiler complete information about the proper arithmetic to use. Notice that this constant is being used in a context that expects an expression of type u64, but it's currently evaluated using 32-bit arithmetic. Addresses-Coverity-ID: 1485796 ("Unintentional integer overflow") Fixes: ed22c6d9304d ("drm/komeda: Use drm_display_mode "crtc_" prefixed hardware timings") Signed-off-by: Gustavo A. R. Silva Reviewed-by: James Qian Wang (Arm Technology China) Signed-off-by: james qian wang (Arm Technology China) Link: https://patchwork.freedesktop.org/patch/msgid/20190812000801.GA29204@embeddedor --- drivers/gpu/drm/arm/display/komeda/komeda_crtc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c index fa9a459..624d257 100644 --- a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c +++ b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c @@ -27,7 +27,7 @@ static void komeda_crtc_update_clock_ratio(struct komeda_crtc_state *kcrtc_st) return; } - pxlclk = kcrtc_st->base.adjusted_mode.crtc_clock * 1000; + pxlclk = kcrtc_st->base.adjusted_mode.crtc_clock * 1000ULL; aclk = komeda_crtc_get_aclk(kcrtc_st); kcrtc_st->clock_ratio = div64_u64(aclk << 32, pxlclk); -- 2.7.4