linux-hardening - [PATCH][next] ath10k: Replace zero-length arrays with DECLARE_FLEX

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Message-ID: <YzIcoloIQBDqGlgc@work>
Date:   Mon, 26 Sep 2022 16:41:54 -0500
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     ath10k@...ts.infradead.org, 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] ath10k: Replace zero-length arrays with
 DECLARE_FLEX_ARRAY() helper

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

This helper allows for flexible-array members in unions.

Link: https://github.com/KSPP/linux/issues/193
Link: https://github.com/KSPP/linux/issues/212
Link: https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 drivers/net/wireless/ath/ath10k/htt.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/htt.h b/drivers/net/wireless/ath/ath10k/htt.h
index f06cf39204e2..c051a22fce14 100644
--- a/drivers/net/wireless/ath/ath10k/htt.h
+++ b/drivers/net/wireless/ath/ath10k/htt.h
@@ -1108,8 +1108,10 @@ struct htt_rx_in_ord_ind {
 	u8 reserved;
 	__le16 msdu_count;
 	union {
-		struct htt_rx_in_ord_msdu_desc msdu_descs32[0];
-		struct htt_rx_in_ord_msdu_desc_ext msdu_descs64[0];
+		DECLARE_FLEX_ARRAY(struct htt_rx_in_ord_msdu_desc,
+				   msdu_descs32);
+		DECLARE_FLEX_ARRAY(struct htt_rx_in_ord_msdu_desc_ext,
+				   msdu_descs64);
 	} __packed;
 } __packed;
 
-- 
2.34.1