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

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Message-ID: <YzIvzc0jsYLigO8a@work>
Date:   Mon, 26 Sep 2022 18:03:41 -0500
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Stanislaw Gruszka <stf_xl@...pl>, 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:     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] iwlegacy: 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/223
Link: https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 drivers/net/wireless/intel/iwlegacy/commands.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlegacy/commands.h b/drivers/net/wireless/intel/iwlegacy/commands.h
index 4a97310f8fee..28cf4e832152 100644
--- a/drivers/net/wireless/intel/iwlegacy/commands.h
+++ b/drivers/net/wireless/intel/iwlegacy/commands.h
@@ -1710,7 +1710,7 @@ struct il4965_tx_resp {
 	 */
 	union {
 		__le32 status;
-		struct agg_tx_status agg_status[0];	/* for each agg frame */
+		DECLARE_FLEX_ARRAY(struct agg_tx_status, agg_status);	/* for each agg frame */
 	} u;
 } __packed;
 
@@ -3365,7 +3365,7 @@ struct il_rx_pkt {
 		struct il_compressed_ba_resp compressed_ba;
 		struct il_missed_beacon_notif missed_beacon;
 		__le32 status;
-		u8 raw[0];
+		DECLARE_FLEX_ARRAY(u8, raw);
 	} u;
 } __packed;
 
-- 
2.34.1