There is a regular need in the kernel to provide a way to declare
having a dynamically sized set of trailing elements in a structure.
Kernel code should always use “flexible array members”[1] for these
cases. The older style of one-element or zero-length arrays should no
longer be used[2][3].
[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays
[3] https://github.com/KSPP/linux/issues/78
Fixes: 9f599f351e86 ("media: amphion: add vpu core driver")
Cc: Ming Qian <[email protected]>
Cc: Shijie Qin <[email protected]>
Cc: Zhou Peng <[email protected]>
Cc: Mauro Carvalho Chehab <[email protected]>
Cc: Gustavo A. R. Silva <[email protected]>
Cc: [email protected]
Signed-off-by: Kees Cook <[email protected]>
---
drivers/media/platform/amphion/vpu_dbg.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/media/platform/amphion/vpu_dbg.c b/drivers/media/platform/amphion/vpu_dbg.c
index da62bd718fb8..f72c8a506b22 100644
--- a/drivers/media/platform/amphion/vpu_dbg.c
+++ b/drivers/media/platform/amphion/vpu_dbg.c
@@ -27,7 +27,7 @@ struct print_buf_desc {
u32 bytes;
u32 read;
u32 write;
- char buffer[0];
+ char buffer[];
};
static char *vb2_stat_name[] = {
--
2.32.0
On Fri, May 27, 2022 at 02:29:53PM -0700, Kees Cook wrote:
> There is a regular need in the kernel to provide a way to declare
> having a dynamically sized set of trailing elements in a structure.
> Kernel code should always use “flexible array members”[1] for these
> cases. The older style of one-element or zero-length arrays should no
> longer be used[2][3].
>
> [1] https://en.wikipedia.org/wiki/Flexible_array_member
> [2] https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays
> [3] https://github.com/KSPP/linux/issues/78
>
> Fixes: 9f599f351e86 ("media: amphion: add vpu core driver")
> Cc: Ming Qian <[email protected]>
> Cc: Shijie Qin <[email protected]>
> Cc: Zhou Peng <[email protected]>
> Cc: Mauro Carvalho Chehab <[email protected]>
> Cc: Gustavo A. R. Silva <[email protected]>
> Cc: [email protected]
> Signed-off-by: Kees Cook <[email protected]>
Reviewed-by: Gustavo A. R. Silva <[email protected]>
Thanks
--
Gustavo
> ---
> drivers/media/platform/amphion/vpu_dbg.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/media/platform/amphion/vpu_dbg.c b/drivers/media/platform/amphion/vpu_dbg.c
> index da62bd718fb8..f72c8a506b22 100644
> --- a/drivers/media/platform/amphion/vpu_dbg.c
> +++ b/drivers/media/platform/amphion/vpu_dbg.c
> @@ -27,7 +27,7 @@ struct print_buf_desc {
> u32 bytes;
> u32 read;
> u32 write;
> - char buffer[0];
> + char buffer[];
> };
>
> static char *vb2_stat_name[] = {
> --
> 2.32.0
>
> From: Kees Cook <[email protected]>
> Sent: 2022??5??28?? 5:30
> To: Ming Qian <[email protected]>
> Cc: Kees Cook <[email protected]>; Shijie Qin <[email protected]>;
> Eagle Zhou <[email protected]>; Mauro Carvalho Chehab
> <[email protected]>; Gustavo A . R . Silva <[email protected]>;
> [email protected]; Hans Verkuil <[email protected]>; Nicolas
> Dufresne <[email protected]>; [email protected];
> [email protected]
> Subject: [EXT] [PATCH] media: amphion: Replace zero-length array with
> flexible-array member
>
> Caution: EXT Email
>
> There is a regular need in the kernel to provide a way to declare having a
> dynamically sized set of trailing elements in a structure.
> Kernel code should always use ??flexible array members??[1] for these cases.
> The older style of one-element or zero-length arrays should no longer be
> used[2][3].
>
> [1]
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wiki
> pedia.org%2Fwiki%2FFlexible_array_member&data=05%7C01%7Cming.q
> ian%40nxp.com%7C8f4e000999114f77682908da40280bd5%7C686ea1d3bc2
> b4c6fa92cd99c5c301635%7C0%7C0%7C637892837984973240%7CUnknown
> %7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haW
> wiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=DjFIwJC45pAqdCP5EE
> QE7n5F8GH45NdWrQoXunNEhZY%3D&reserved=0
> [2]
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ke
> rnel.org%2Fdoc%2Fhtml%2Flatest%2Fprocess%2Fdeprecated.html%23zero-len
> gth-and-one-element-arrays&data=05%7C01%7Cming.qian%40nxp.com%
> 7C8f4e000999114f77682908da40280bd5%7C686ea1d3bc2b4c6fa92cd99c5c
> 301635%7C0%7C0%7C637892837984973240%7CUnknown%7CTWFpbGZsb3
> d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%
> 3D%7C3000%7C%7C%7C&sdata=xKvM4qigtFIfvBzNDka44uqTUfloTnNmC
> xPVAhlk5tc%3D&reserved=0
> [3]
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.
> com%2FKSPP%2Flinux%2Fissues%2F78&data=05%7C01%7Cming.qian%4
> 0nxp.com%7C8f4e000999114f77682908da40280bd5%7C686ea1d3bc2b4c6fa
> 92cd99c5c301635%7C0%7C0%7C637892837984973240%7CUnknown%7CT
> WFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJ
> XVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=uzEzW1AEtyWGsmJCHJ%2F
> DfMqa4lCsJjmVfz7KRugzOho%3D&reserved=0
>
> Fixes: 9f599f351e86 ("media: amphion: add vpu core driver")
> Cc: Ming Qian <[email protected]>
> Cc: Shijie Qin <[email protected]>
> Cc: Zhou Peng <[email protected]>
> Cc: Mauro Carvalho Chehab <[email protected]>
> Cc: Gustavo A. R. Silva <[email protected]>
> Cc: [email protected]
> Signed-off-by: Kees Cook <[email protected]>
Reviewed-by: ming_qian <[email protected]>
> ---
> drivers/media/platform/amphion/vpu_dbg.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/media/platform/amphion/vpu_dbg.c
> b/drivers/media/platform/amphion/vpu_dbg.c
> index da62bd718fb8..f72c8a506b22 100644
> --- a/drivers/media/platform/amphion/vpu_dbg.c
> +++ b/drivers/media/platform/amphion/vpu_dbg.c
> @@ -27,7 +27,7 @@ struct print_buf_desc {
> u32 bytes;
> u32 read;
> u32 write;
> - char buffer[0];
> + char buffer[];
> };
>
> static char *vb2_stat_name[] = {
> --
> 2.32.0
On Fri, May 27, 2022 at 02:29:53PM -0700, Kees Cook wrote:
> There is a regular need in the kernel to provide a way to declare
> having a dynamically sized set of trailing elements in a structure.
> Kernel code should always use “flexible array members”[1] for these
> cases. The older style of one-element or zero-length arrays should no
> longer be used[2][3].
>
> [1] https://en.wikipedia.org/wiki/Flexible_array_member
> [2] https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays
> [3] https://github.com/KSPP/linux/issues/78
>
> Fixes: 9f599f351e86 ("media: amphion: add vpu core driver")
> Cc: Ming Qian <[email protected]>
> Cc: Shijie Qin <[email protected]>
> Cc: Zhou Peng <[email protected]>
> Cc: Mauro Carvalho Chehab <[email protected]>
> Cc: Gustavo A. R. Silva <[email protected]>
> Cc: [email protected]
> Signed-off-by: Kees Cook <[email protected]>
> ---
> drivers/media/platform/amphion/vpu_dbg.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/media/platform/amphion/vpu_dbg.c b/drivers/media/platform/amphion/vpu_dbg.c
> index da62bd718fb8..f72c8a506b22 100644
> --- a/drivers/media/platform/amphion/vpu_dbg.c
> +++ b/drivers/media/platform/amphion/vpu_dbg.c
> @@ -27,7 +27,7 @@ struct print_buf_desc {
> u32 bytes;
> u32 read;
> u32 write;
> - char buffer[0];
> + char buffer[];
> };
>
> static char *vb2_stat_name[] = {
> --
> 2.32.0
>
Hi,
Looks good to me, thanks.
Reviewed-by: Tommaso Merciai <[email protected]>
--
Tommaso Merciai
Embedded Linux Engineer
[email protected]
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