[PATCH 07/21] dmaengine: qcom: bam_dma: Annotate struct bam_async_desc with __counted_by
Kees Cook
keescook at chromium.org
Thu Aug 17 16:58:44 PDT 2023
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 at kernel.org>
Cc: Andy Gross <agross at kernel.org>
Cc: Bjorn Andersson <andersson at kernel.org>
Cc: Konrad Dybcio <konrad.dybcio at linaro.org>
Cc: linux-arm-msm at vger.kernel.org
Cc: dmaengine at vger.kernel.org
Signed-off-by: Kees Cook <keescook at chromium.org>
---
drivers/dma/qcom/bam_dma.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c
index 4c3eb972039d..65b89bb7a56b 100644
--- a/drivers/dma/qcom/bam_dma.c
+++ b/drivers/dma/qcom/bam_dma.c
@@ -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 {
--
2.34.1
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