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[4/9] drm/msm/dpu: Annotate struct dpu_hw_intr with __counted_by

Message ID 20230922173216.3823169-4-keescook@chromium.org
State Accepted
Commit 8f5d3daad715ea55d1cfdaa3e180d3820237cad5
Headers show
Series drm: Annotate structs with __counted_by | expand

Commit Message

Kees Cook Sept. 22, 2023, 5:32 p.m. UTC 
Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct dpu_hw_intr.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Rob Clark <robdclark@gmail.com>
Cc: Abhinav Kumar <quic_abhinavk@quicinc.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Cc: Sean Paul <sean@poorly.run>
Cc: Marijn Suijten <marijn.suijten@somainline.org>
Cc: David Airlie <airlied@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Bjorn Andersson <andersson@kernel.org>
Cc: linux-arm-msm@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: freedreno@lists.freedesktop.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h
index dab761e54863..50cf9523d367 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h
@@ -61,7 +61,7 @@  struct dpu_hw_intr {
 		void (*cb)(void *arg, int irq_idx);
 		void *arg;
 		atomic_t count;
-	} irq_tbl[];
+	} irq_tbl[] __counted_by(total_irqs);
 };
 
 /**