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[130.126.255.54]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6d1798a839bsm44970316d6.36.2024.10.29.12.42.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 29 Oct 2024 12:42:56 -0700 (PDT) From: Gax-c To: robdclark@gmail.com, quic_abhinavk@quicinc.com, dmitry.baryshkov@linaro.org, sean@poorly.run, marijn.suijten@somainline.org, airlied@gmail.com, simona@ffwll.ch, quic_kalyant@quicinc.com Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, Zichen Xie Subject: [PATCH v2] drm/msm/dpu: cast crtc_clk calculation to u64 in _dpu_core_perf_calc_clk() Date: Tue, 29 Oct 2024 14:42:10 -0500 Message-Id: <20241029194209.23684-1-zichenxie0106@gmail.com> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Zichen Xie There may be a potential integer overflow issue in _dpu_core_perf_calc_clk(). crtc_clk is defined as u64, while mode->vtotal, mode->hdisplay, and drm_mode_vrefresh(mode) are defined as a smaller data type. The result of the calculation will be limited to "int" in this case without correct casting. In screen with high resolution and high refresh rate, integer overflow may happen. So, we recommend adding an extra cast to prevent potential integer overflow. Fixes: c33b7c0389e1 ("drm/msm/dpu: add support for clk and bw scaling for display") Signed-off-by: Zichen Xie Reviewed-by: Abhinav Kumar --- v2: Adjust subject. --- drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c index 68fae048a9a8..260accc151d4 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c @@ -80,7 +80,7 @@ static u64 _dpu_core_perf_calc_clk(const struct dpu_perf_cfg *perf_cfg, mode = &state->adjusted_mode; - crtc_clk = mode->vtotal * mode->hdisplay * drm_mode_vrefresh(mode); + crtc_clk = (u64)mode->vtotal * mode->hdisplay * drm_mode_vrefresh(mode); drm_atomic_crtc_for_each_plane(plane, crtc) { pstate = to_dpu_plane_state(plane->state);