Re: [PATCH 10/21] dmaengine: sprd: Annotate struct sprd_dma_dev with __counted_by

From: Gustavo A. R. Silva
Date: Thu Aug 17 2023 - 21:24:59 EST




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 sprd_dma_dev.

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

Cc: Vinod Koul <vkoul@xxxxxxxxxx>
Cc: Orson Zhai <orsonzhai@xxxxxxxxx>
Cc: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Cc: Chunyan Zhang <zhang.lyra@xxxxxxxxx>
Cc: dmaengine@xxxxxxxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>

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

Thanks
--
Gustavo

---
drivers/dma/sprd-dma.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
index 168aa0bd73a0..07871dcc4593 100644
--- a/drivers/dma/sprd-dma.c
+++ b/drivers/dma/sprd-dma.c
@@ -212,7 +212,7 @@ struct sprd_dma_dev {
struct clk *ashb_clk;
int irq;
u32 total_chns;
- struct sprd_dma_chn channels[];
+ struct sprd_dma_chn channels[] __counted_by(total_chns);
};
static void sprd_dma_free_desc(struct virt_dma_desc *vd);