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 <vkoul@xxxxxxxxxx> Cc: Nathan Chancellor <nathan@xxxxxxxxxx> Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> Cc: Tom Rix <trix@xxxxxxxxxx> Cc: dmaengine@xxxxxxxxxxxxxxx Cc: llvm@xxxxxxxxxxxxxxx Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> --- drivers/dma/ep93xx_dma.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/dma/ep93xx_dma.c b/drivers/dma/ep93xx_dma.c index 5c4a448a1254..d6c60635e90d 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) -- 2.34.1
