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[17/21] dmaengine: ti: edma: Annotate struct edma_desc with __counted_by

Message ID 20230817235859.49846-17-keescook@chromium.org
State Accepted
Commit 5f240e0cdbcb0cc60d6a75ea7d492ce93b7fd52e
Headers show
Series dmaengine: Annotate with __counted_by | expand

Commit Message

Kees Cook Aug. 17, 2023, 11:58 p.m. UTC 
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 edma_desc.

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

Cc: Vinod Koul <vkoul@kernel.org>
Cc: Peter Ujfalusi <peter.ujfalusi@gmail.com>
Cc: dmaengine@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 drivers/dma/ti/edma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/dma/ti/edma.c b/drivers/dma/ti/edma.c
index aa8e2e8ac260..9c2b2c4c3882 100644
--- a/drivers/dma/ti/edma.c
+++ b/drivers/dma/ti/edma.c
@@ -202,7 +202,7 @@  struct edma_desc {
 	u32				residue;
 	u32				residue_stat;
 
-	struct edma_pset		pset[];
+	struct edma_pset		pset[] __counted_by(pset_nr);
 };
 
 struct edma_cc;