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 admac_data. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Vinod Koul <vkoul@xxxxxxxxxx> Cc: Hector Martin <marcan@xxxxxxxxx> Cc: Sven Peter <sven@xxxxxxxxxxxxx> Cc: Alyssa Rosenzweig <alyssa@xxxxxxxxxxxxx> Cc: asahi@xxxxxxxxxxxxxxx Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx Cc: dmaengine@xxxxxxxxxxxxxxx Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> --- drivers/dma/apple-admac.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/dma/apple-admac.c b/drivers/dma/apple-admac.c index 3af795635c5c..ff46260b6ebc 100644 --- a/drivers/dma/apple-admac.c +++ b/drivers/dma/apple-admac.c @@ -128,7 +128,7 @@ struct admac_data { int irq; int irq_index; int nchannels; - struct admac_chan channels[]; + struct admac_chan channels[] __counted_by(nchannels); }; struct admac_tx { -- 2.34.1
