[PATCH][next] drm/nouveau/nvkm: Replace zero-length array with flexible-array member

[PATCH][next] drm/nouveau/nvkm: Replace zero-length array with flexible-array member

[Gustavo A. R. Silva]

Zero-length arrays are deprecated[1] and we are moving towards
adopting C99 flexible-array members instead. So, replace zero-length
array declaration in struct nvfw_hs_load_header_v2 with flex-array
member.

This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
routines on memcpy() and help us make progress towards globally
enabling -fstrict-flex-arrays=3 [2].

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays [1]
Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [2]
Link: https://github.com/KSPP/linux/issues/78
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
 drivers/gpu/drm/nouveau/include/nvfw/hs.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/include/nvfw/hs.h b/drivers/gpu/drm/nouveau/include/nvfw/hs.h
index 8c4cd08a7b5f..8b58b668fc0c 100644
--- a/drivers/gpu/drm/nouveau/include/nvfw/hs.h
+++ b/drivers/gpu/drm/nouveau/include/nvfw/hs.h
@@ -52,7 +52,7 @@ struct nvfw_hs_load_header_v2 {
 	struct {
 		u32 offset;
 		u32 size;
-	} app[0];
+	} app[];
 };
 
 const struct nvfw_hs_load_header_v2 *nvfw_hs_load_header_v2(struct nvkm_subdev *, const void *);
-- 
2.34.1

Re: [PATCH][next] drm/nouveau/nvkm: Replace zero-length array with flexible-array member

[Kees Cook]

On Mon, Jan 09, 2023 at 07:39:30PM -0600, Gustavo A. R. Silva wrote:
> Zero-length arrays are deprecated[1] and we are moving towards
> adopting C99 flexible-array members instead. So, replace zero-length
> array declaration in struct nvfw_hs_load_header_v2 with flex-array
> member.
> 
> This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
> routines on memcpy() and help us make progress towards globally
> enabling -fstrict-flex-arrays=3 [2].
> 
> Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays [1]
> Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [2]
> Link: https://github.com/KSPP/linux/issues/78
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

Reviewed-by: Kees Cook <keescook@chromium.org>

-- 
Kees Cook

Re: [PATCH][next] drm/nouveau/nvkm: Replace zero-length array with flexible-array member

[Karol Herbst]

Reviewed-by: Karol Herbst <kherbst@redhat.com>

will push in a moment

On Thu, Jan 12, 2023 at 11:49 PM Kees Cook <keescook@chromium.org> wrote:
>
> On Mon, Jan 09, 2023 at 07:39:30PM -0600, Gustavo A. R. Silva wrote:
> > Zero-length arrays are deprecated[1] and we are moving towards
> > adopting C99 flexible-array members instead. So, replace zero-length
> > array declaration in struct nvfw_hs_load_header_v2 with flex-array
> > member.
> >
> > This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
> > routines on memcpy() and help us make progress towards globally
> > enabling -fstrict-flex-arrays=3 [2].
> >
> > Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays [1]
> > Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [2]
> > Link: https://github.com/KSPP/linux/issues/78
> > Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
>
> Reviewed-by: Kees Cook <keescook@chromium.org>
>
> --
> Kees Cook
>