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

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Date:   Wed, 16 Feb 2022 13:49:35 -0600
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Arend van Spriel <aspriel@...il.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Chi-hsien Lin <chi-hsien.lin@...ineon.com>,
        Wright Feng <wright.feng@...ineon.com>,
        Chung-hsien Hsu <chung-hsien.hsu@...ineon.com>,
        Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     linux-wireless@...r.kernel.org,
        brcm80211-dev-list.pdl@...adcom.com,
        SHA-cyfmac-dev-list@...ineon.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-hardening@...r.kernel.org
Subject: [PATCH][next] brcmfmac: 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/broadcom/brcm80211/brcmfmac/fwil_types.h | 2 +-
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/xtlv.h       | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h
index e69d1e56996f..c87b829adb0d 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h
@@ -1068,7 +1068,7 @@ struct brcmf_mkeep_alive_pkt_le {
 	__le32  period_msec;
 	__le16  len_bytes;
 	u8   keep_alive_id;
-	u8   data[0];
+	u8   data[];
 } __packed;
 
 #endif /* FWIL_TYPES_H_ */
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/xtlv.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/xtlv.h
index e1930ce1b642..b2c7ae8966a1 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/xtlv.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/xtlv.h
@@ -15,7 +15,7 @@
 struct brcmf_xtlv {
 	u16 id;
 	u16 len;
-	u8 data[0];
+	u8 data[];
 };
 
 enum brcmf_xtlv_option {
-- 
2.27.0