Zero-length arrays as fake flexible arrays are deprecated and we are
moving towards adopting C99 flexible-array members instead.

Address the following warning found with GCC-13 and
-fstrict-flex-array=3 enabled:
drivers/net/wireless/rndis_wlan.c:2902:23: warning: array subscript 0 is outside array bounds of ‘struct ndis_80211_auth_request[0]’ [-Warray-bounds=]

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 [1].

Link: https://github.com/KSPP/linux/issues/21
Link: https://github.com/KSPP/linux/issues/274
Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [1]
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
 drivers/net/wireless/legacy/rndis_wlan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/legacy/rndis_wlan.c b/drivers/net/wireless/legacy/rndis_wlan.c
index bf72e5fd39cf..54c347fa54c4 100644
--- a/drivers/net/wireless/legacy/rndis_wlan.c
+++ b/drivers/net/wireless/legacy/rndis_wlan.c
@@ -209,7 +209,7 @@ struct ndis_80211_status_indication {
 	union {
 		__le32					media_stream_mode;
 		__le32					radio_status;
-		struct ndis_80211_auth_request		auth_request[0];
+		DECLARE_FLEX_ARRAY(struct ndis_80211_auth_request, auth_request);
 		struct ndis_80211_pmkid_cand_list	cand_list;
 	} u;
 } __packed;
-- 
2.34.1

"Gustavo A. R. Silva" <gustavoars@kernel.org> wrote:

> Zero-length arrays as fake flexible arrays are deprecated and we are
> moving towards adopting C99 flexible-array members instead.
> 
> Address the following warning found with GCC-13 and
> -fstrict-flex-array=3 enabled:
> drivers/net/wireless/rndis_wlan.c:2902:23: warning: array subscript 0 is outside array bounds of ‘struct ndis_80211_auth_request[0]’ [-Warray-bounds=]
> 
> 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 [1].
> 
> Link: https://github.com/KSPP/linux/issues/21
> Link: https://github.com/KSPP/linux/issues/274
> Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [1]
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

Patch applied to wireless-next.git, thanks.

06dabcccc08b wifi: rndis_wlan: Replace fake flex-array with flexible-array member

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/ZBtIbU77L9eXqa4j@work/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches

Hi all,

Friendly ping: who can take this, please? 😄

Thanks
-- 
Gustavo

On 3/22/23 12:26, Gustavo A. R. Silva wrote:
> Zero-length arrays as fake flexible arrays are deprecated and we are
> moving towards adopting C99 flexible-array members instead.
> 
> Address the following warning found with GCC-13 and
> -fstrict-flex-array=3 enabled:
> drivers/net/wireless/rndis_wlan.c:2902:23: warning: array subscript 0 is outside array bounds of ‘struct ndis_80211_auth_request[0]’ [-Warray-bounds=]
> 
> 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 [1].
> 
> Link: https://github.com/KSPP/linux/issues/21
> Link: https://github.com/KSPP/linux/issues/274
> Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [1]
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> ---
>   drivers/net/wireless/legacy/rndis_wlan.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/legacy/rndis_wlan.c b/drivers/net/wireless/legacy/rndis_wlan.c
> index bf72e5fd39cf..54c347fa54c4 100644
> --- a/drivers/net/wireless/legacy/rndis_wlan.c
> +++ b/drivers/net/wireless/legacy/rndis_wlan.c
> @@ -209,7 +209,7 @@ struct ndis_80211_status_indication {
>   	union {
>   		__le32					media_stream_mode;
>   		__le32					radio_status;
> -		struct ndis_80211_auth_request		auth_request[0];
> +		DECLARE_FLEX_ARRAY(struct ndis_80211_auth_request, auth_request);
>   		struct ndis_80211_pmkid_cand_list	cand_list;
>   	} u;
>   } __packed;