From 81cd3cb3b3dd37df1fc45c5b6443a07bc2a7fee4 Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Thu, 17 Aug 2023 16:58:39 -0700 Subject: dmaengine: at_hdmac: Annotate struct at_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 at_desc. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Vinod Koul Cc: Ludovic Desroches Cc: Tudor Ambarus Cc: linux-arm-kernel@lists.infradead.org Cc: dmaengine@vger.kernel.org Signed-off-by: Kees Cook Reviewed-by: Tudor Ambarus Reviewed-by: "Gustavo A. R. Silva" Link: https://lore.kernel.org/r/20230817235859.49846-2-keescook@chromium.org Signed-off-by: Vinod Koul --- drivers/dma/at_hdmac.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c index 417a9428a9b6..fb89ecbf0cc5 100644 --- a/drivers/dma/at_hdmac.c +++ b/drivers/dma/at_hdmac.c @@ -239,7 +239,7 @@ struct at_desc { bool memset_buffer; dma_addr_t memset_paddr; int *memset_vaddr; - struct atdma_sg sg[]; + struct atdma_sg sg[] __counted_by(sglen); }; /*-- Channels --------------------------------------------------------*/ -- cgit v1.2.3