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    SubjectRe: [PATCH 05/21] dmaengine: hisilicon: Annotate struct hisi_dma_dev with __counted_by
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    On 8/17/23 17:58, 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 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 hisi_dma_dev.
    >
    > [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
    >
    > Cc: Vinod Koul <vkoul@kernel.org>
    > Cc: Zhou Wang <wangzhou1@hisilicon.com>
    > Cc: Jie Hai <haijie1@huawei.com>
    > Cc: dmaengine@vger.kernel.org
    > Signed-off-by: Kees Cook <keescook@chromium.org>

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

    Thanks
    --
    Gustavo

    > ---
    > drivers/dma/hisi_dma.c | 2 +-
    > 1 file changed, 1 insertion(+), 1 deletion(-)
    >
    > diff --git a/drivers/dma/hisi_dma.c b/drivers/dma/hisi_dma.c
    > index c1350a36fddd..4c47bff81064 100644
    > --- a/drivers/dma/hisi_dma.c
    > +++ b/drivers/dma/hisi_dma.c
    > @@ -163,7 +163,7 @@ struct hisi_dma_dev {
    > u32 chan_depth;
    > enum hisi_dma_reg_layout reg_layout;
    > void __iomem *queue_base; /* queue region start of register */
    > - struct hisi_dma_chan chan[];
    > + struct hisi_dma_chan chan[] __counted_by(chan_num);
    > };
    >
    > #ifdef CONFIG_DEBUG_FS

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