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SubjectRe: [PATCH] dmaengine: fsl-edma: Annotate struct struct fsl_edma_engine with __counted_by
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On 10/4/23 01:27, Kees Cook wrote:
> 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 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 struct fsl_edma_engine.
>
> Cc: Vinod Koul <vkoul@kernel.org>
> Cc: dmaengine@vger.kernel.org
> Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
> Signed-off-by: Kees Cook <keescook@chromium.org>

Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>

Thanks
--
Gustavo

> ---
> drivers/dma/fsl-edma-common.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/dma/fsl-edma-common.h b/drivers/dma/fsl-edma-common.h
> index 40d50cc3d75a..bb5221158a77 100644
> --- a/drivers/dma/fsl-edma-common.h
> +++ b/drivers/dma/fsl-edma-common.h
> @@ -225,7 +225,7 @@ struct fsl_edma_engine {
> bool big_endian;
> struct edma_regs regs;
> u64 chan_masked;
> - struct fsl_edma_chan chans[];
> + struct fsl_edma_chan chans[] __counted_by(n_chans);
> };
>
> #define edma_read_tcdreg(chan, __name) \

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