netdev - [PATCH net-next 11/23] can: etas_es58x: Replace zero-length array with DECLARE_FLEX

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Date:   Thu, 15 Sep 2022 10:20:01 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, linux-can@...r.kernel.org,
        kernel@...gutronix.de,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        Kees Cook <keescook@...omium.org>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net-next 11/23] can: etas_es58x: Replace zero-length array with DECLARE_FLEX_ARRAY() helper

From: "Gustavo A. R. Silva" <gustavoars@...nel.org>

Zero-length arrays are deprecated and we are moving towards adopting
C99 flexible-array members, instead. So, replace zero-length array
declaration in union es58x_urb_cmd with the new DECLARE_FLEX_ARRAY()
helper macro.

This helper allows for a flexible-array member in a union.

Link: https://github.com/KSPP/linux/issues/193
Link: https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
Acked-by: Vincent Mailhol <mailhol.vincent@...adoo.fr>
Reviewed-by: Kees Cook <keescook@...omium.org>
Link: https://lore.kernel.org/all/Yw00w6XRcq7B6ub6@work
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/usb/etas_es58x/es58x_core.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/can/usb/etas_es58x/es58x_core.h b/drivers/net/can/usb/etas_es58x/es58x_core.h
index d769bdf740b7..640fe0a1df63 100644
--- a/drivers/net/can/usb/etas_es58x/es58x_core.h
+++ b/drivers/net/can/usb/etas_es58x/es58x_core.h
@@ -222,7 +222,7 @@ union es58x_urb_cmd {
 		u8 cmd_type;
 		u8 cmd_id;
 	} __packed;
-	u8 raw_cmd[0];
+	DECLARE_FLEX_ARRAY(u8, raw_cmd);
 };
 
 /**
-- 
2.35.1