From: Kees Cook Date: Thu, 28 Sep 2023 23:43:42 +0000 (-0700) Subject: dmaengine: ep93xx_dma: Annotate struct ep93xx_dma_engine with __counted_by X-Git-Tag: v6.7-rc1~73^2~17 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=74d885711c2f619e92f41ef308691948cc63f224;p=thirdparty%2Fkernel%2Flinux.git dmaengine: ep93xx_dma: Annotate struct ep93xx_dma_engine 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 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 ep93xx_dma_engine. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Vinod Koul Cc: Nathan Chancellor Cc: Nick Desaulniers Cc: Tom Rix Cc: dmaengine@vger.kernel.org Cc: llvm@lists.linux.dev Signed-off-by: Kees Cook Reviewed-by: "Gustavo A. R. Silva" Link: https://lore.kernel.org/r/20230928234334.work.391-kees@kernel.org Signed-off-by: Vinod Koul --- diff --git a/drivers/dma/ep93xx_dma.c b/drivers/dma/ep93xx_dma.c index 5c4a448a12541..d6c60635e90db 100644 --- a/drivers/dma/ep93xx_dma.c +++ b/drivers/dma/ep93xx_dma.c @@ -213,7 +213,7 @@ struct ep93xx_dma_engine { #define INTERRUPT_NEXT_BUFFER 2 size_t num_channels; - struct ep93xx_dma_chan channels[]; + struct ep93xx_dma_chan channels[] __counted_by(num_channels); }; static inline struct device *chan2dev(struct ep93xx_dma_chan *edmac)