From: Geert Uytterhoeven <geert+renesas@glider.be> To: Rob Clark <robdclark@gmail.com>, Abhinav Kumar <quic_abhinavk@quicinc.com>, Dmitry Baryshkov <dmitry.baryshkov@linaro.org>, Sean Paul <sean@poorly.run>, David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>, Vinod Koul <vkoul@kernel.org>, Konrad Dybcio <konrad.dybcio@linaro.org>, Bjorn Andersson <andersson@kernel.org>, Neil Armstrong <neil.armstrong@linaro.org>, Kuogee Hsieh <quic_khsieh@quicinc.com> Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven <geert+renesas@glider.be> Subject: [PATCH] drm/msm/dpu: Fix bit-shifting UB in DPU_HW_VER() macro Date: Mon, 6 Mar 2023 10:06:33 +0100 [thread overview] Message-ID: <20230306090633.65918-1-geert+renesas@glider.be> (raw) With gcc-5 and CONFIG_UBSAN_SHIFT=y: drivers/gpu/drm/msm/msm_mdss.c: In function 'msm_mdss_enable': drivers/gpu/drm/msm/msm_mdss.c:296:2: error: case label does not reduce to an integer constant case DPU_HW_VER_800: ^ drivers/gpu/drm/msm/msm_mdss.c:299:2: error: case label does not reduce to an integer constant case DPU_HW_VER_810: ^ drivers/gpu/drm/msm/msm_mdss.c:300:2: error: case label does not reduce to an integer constant case DPU_HW_VER_900: ^ This happens because for major revisions 8 or greather, the non-sign bit of the major revision number is shifted into bit 31 of a signed integer, which is undefined behavior. Fix this by casting the major revision number to unsigned int. Fixes: efcd0107727c4f04 ("drm/msm/dpu: add support for SM8550") Fixes: 4a352c2fc15aec1e ("drm/msm/dpu: Introduce SC8280XP") Fixes: 100d7ef6995d1f86 ("drm/msm/dpu: add support for SM8450") Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> --- drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h index ddab9caebb18c40d..bbd3cbdd77956c5d 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h @@ -19,8 +19,9 @@ */ #define MAX_BLOCKS 12 -#define DPU_HW_VER(MAJOR, MINOR, STEP) (((MAJOR & 0xF) << 28) |\ - ((MINOR & 0xFFF) << 16) |\ +#define DPU_HW_VER(MAJOR, MINOR, STEP) \ + ((((unsigned int)MAJOR & 0xF) << 28) | \ + ((MINOR & 0xFFF) << 16) | \ (STEP & 0xFFFF)) #define DPU_HW_MAJOR(rev) ((rev) >> 28) -- 2.34.1
WARNING: multiple messages have this Message-ID (diff)
From: Geert Uytterhoeven <geert+renesas@glider.be> To: Rob Clark <robdclark@gmail.com>, Abhinav Kumar <quic_abhinavk@quicinc.com>, Dmitry Baryshkov <dmitry.baryshkov@linaro.org>, Sean Paul <sean@poorly.run>, David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>, Vinod Koul <vkoul@kernel.org>, Konrad Dybcio <konrad.dybcio@linaro.org>, Bjorn Andersson <andersson@kernel.org>, Neil Armstrong <neil.armstrong@linaro.org>, Kuogee Hsieh <quic_khsieh@quicinc.com> Cc: linux-arm-msm@vger.kernel.org, Geert Uytterhoeven <geert+renesas@glider.be>, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [PATCH] drm/msm/dpu: Fix bit-shifting UB in DPU_HW_VER() macro Date: Mon, 6 Mar 2023 10:06:33 +0100 [thread overview] Message-ID: <20230306090633.65918-1-geert+renesas@glider.be> (raw) With gcc-5 and CONFIG_UBSAN_SHIFT=y: drivers/gpu/drm/msm/msm_mdss.c: In function 'msm_mdss_enable': drivers/gpu/drm/msm/msm_mdss.c:296:2: error: case label does not reduce to an integer constant case DPU_HW_VER_800: ^ drivers/gpu/drm/msm/msm_mdss.c:299:2: error: case label does not reduce to an integer constant case DPU_HW_VER_810: ^ drivers/gpu/drm/msm/msm_mdss.c:300:2: error: case label does not reduce to an integer constant case DPU_HW_VER_900: ^ This happens because for major revisions 8 or greather, the non-sign bit of the major revision number is shifted into bit 31 of a signed integer, which is undefined behavior. Fix this by casting the major revision number to unsigned int. Fixes: efcd0107727c4f04 ("drm/msm/dpu: add support for SM8550") Fixes: 4a352c2fc15aec1e ("drm/msm/dpu: Introduce SC8280XP") Fixes: 100d7ef6995d1f86 ("drm/msm/dpu: add support for SM8450") Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> --- drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h index ddab9caebb18c40d..bbd3cbdd77956c5d 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h @@ -19,8 +19,9 @@ */ #define MAX_BLOCKS 12 -#define DPU_HW_VER(MAJOR, MINOR, STEP) (((MAJOR & 0xF) << 28) |\ - ((MINOR & 0xFFF) << 16) |\ +#define DPU_HW_VER(MAJOR, MINOR, STEP) \ + ((((unsigned int)MAJOR & 0xF) << 28) | \ + ((MINOR & 0xFFF) << 16) | \ (STEP & 0xFFFF)) #define DPU_HW_MAJOR(rev) ((rev) >> 28) -- 2.34.1
next reply other threads:[~2023-03-06 9:06 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-03-06 9:06 Geert Uytterhoeven [this message] 2023-03-06 9:06 ` [PATCH] drm/msm/dpu: Fix bit-shifting UB in DPU_HW_VER() macro Geert Uytterhoeven 2023-03-21 15:08 ` Randy Dunlap 2023-03-21 15:08 ` Randy Dunlap 2023-03-22 20:48 ` Rob Clark 2023-03-22 20:48 ` Rob Clark 2023-03-28 22:37 ` Dmitry Baryshkov 2023-03-28 22:37 ` Dmitry Baryshkov
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