From 8279f0b476f37c51de2ed8bd70d770b2893dd2fa Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Thu, 17 Aug 2023 16:58:48 -0700 Subject: [PATCH] dmaengine: st_fdma: Annotate struct st_fdma_desc with __counted_by 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 st_fdma_desc. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Vinod Koul Cc: Patrice Chotard Cc: linux-arm-kernel@lists.infradead.org Cc: dmaengine@vger.kernel.org Signed-off-by: Kees Cook Reviewed-by: "Gustavo A. R. Silva" Link: https://lore.kernel.org/r/20230817235859.49846-11-keescook@chromium.org Signed-off-by: Vinod Koul --- drivers/dma/st_fdma.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/dma/st_fdma.h b/drivers/dma/st_fdma.h index fa15b97a3bab..f296412e96b6 100644 --- a/drivers/dma/st_fdma.h +++ b/drivers/dma/st_fdma.h @@ -97,7 +97,7 @@ struct st_fdma_desc { struct st_fdma_chan *fchan; bool iscyclic; unsigned int n_nodes; - struct st_fdma_sw_node node[]; + struct st_fdma_sw_node node[] __counted_by(n_nodes); }; enum st_fdma_type {