linux-kernel - [PATCH][next] carl9170: Replace zero-length arrays with flexible-array members

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Message-ID: <20220216194955.GA904126@embeddedor>
Date:   Wed, 16 Feb 2022 13:49:55 -0600
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Christian Lamparter <chunkeey@...glemail.com>,
        Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-hardening@...r.kernel.org
Subject: [PATCH][next] carl9170: Replace zero-length arrays with
 flexible-array members

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].

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays

Link: https://github.com/KSPP/linux/issues/78
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 drivers/net/wireless/ath/carl9170/fwdesc.h | 2 +-
 drivers/net/wireless/ath/carl9170/wlan.h   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/carl9170/fwdesc.h b/drivers/net/wireless/ath/carl9170/fwdesc.h
index 503b21abbba5..10acb6ad30d0 100644
--- a/drivers/net/wireless/ath/carl9170/fwdesc.h
+++ b/drivers/net/wireless/ath/carl9170/fwdesc.h
@@ -149,7 +149,7 @@ struct carl9170fw_fix_entry {
 
 struct carl9170fw_fix_desc {
 	struct carl9170fw_desc_head head;
-	struct carl9170fw_fix_entry data[0];
+	struct carl9170fw_fix_entry data[];
 } __packed;
 #define CARL9170FW_FIX_DESC_SIZE			\
 	(sizeof(struct carl9170fw_fix_desc))
diff --git a/drivers/net/wireless/ath/carl9170/wlan.h b/drivers/net/wireless/ath/carl9170/wlan.h
index bb73553fd7c2..0a4e42e806b9 100644
--- a/drivers/net/wireless/ath/carl9170/wlan.h
+++ b/drivers/net/wireless/ath/carl9170/wlan.h
@@ -327,7 +327,7 @@ struct _carl9170_tx_superdesc {
 struct _carl9170_tx_superframe {
 	struct _carl9170_tx_superdesc s;
 	struct _ar9170_tx_hwdesc f;
-	u8 frame_data[0];
+	u8 frame_data[];
 } __packed __aligned(4);
 
 #define	CARL9170_TX_SUPERDESC_LEN		24
-- 
2.27.0