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dmaengine: qcom: bam_dma: Annotate struct bam_async_desc with __counted_by

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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: Kees Cook <keescook@chromium.org>
Reviewed-by: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20230817235859.49846-7-keescook@chromium.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Kees Cook 2023-08-17 16:58:44 -07:00 committed by Vinod Koul
parent fd1cb31a03
commit b9fe0bd590
1 changed files with 1 additions and 1 deletions
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2
drivers/dma/qcom/bam_dma.c
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@ -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 {