dmaengine: at_hdmac: Annotate struct at_desc with __counted_by
authorKees Cook <keescook@chromium.org>
Thu, 17 Aug 2023 23:58:39 +0000 (16:58 -0700)
committerVinod Koul <vkoul@kernel.org>
Thu, 28 Sep 2023 11:12:02 +0000 (16:42 +0530)
commit81cd3cb3b3dd37df1fc45c5b6443a07bc2a7fee4
treeecb12901e1c8de56e1473067ea0173c32eb3a710
parent83c5d35bf9112577da097c1b4fbfedef93b951e6
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 <vkoul@kernel.org>
Cc: Ludovic Desroches <ludovic.desroches@microchip.com>
Cc: Tudor Ambarus <tudor.ambarus@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: dmaengine@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Reviewed-by: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20230817235859.49846-2-keescook@chromium.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
drivers/dma/at_hdmac.c