Commit b9fe0bd5 authored by Kees Cook's avatar Kees Cook Committed by Vinod Koul
Browse files

dmaengine: qcom: bam_dma: Annotate struct bam_async_desc with __counted_by 

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 bam_async_desc.

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



Cc: Vinod Koul <vkoul@kernel.org>
Cc: Andy Gross <agross@kernel.org>
Cc: Bjorn Andersson <andersson@kernel.org>
Cc: Konrad Dybcio <konrad.dybcio@linaro.org>
Cc: linux-arm-msm@vger.kernel.org
Cc: dmaengine@vger.kernel.org
Signed-off-by: default avatarKees Cook <keescook@chromium.org>
Reviewed-by: default avatar"Gustavo A. R. Silva" <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20230817235859.49846-7-keescook@chromium.org


Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent fd1cb31a

drivers/dma/qcom/bam_dma.c

+1 −1
Original line number Diff line number Diff line
@@ -74,7 +74,7 @@ struct bam_async_desc { 
	struct list_head desc_node;

	enum dma_transfer_direction dir;

	size_t length;

	struct bam_desc_hw desc[];

	struct bam_desc_hw desc[] __counted_by(num_desc);

};



enum bam_reg {