linux-kernel - [PATCH] wil6210: avoid gcc-10 zero-length-bounds warning

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Date:   Tue,  5 May 2020 16:33:24 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Maya Erez <merez@...eaurora.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Dedy Lansky <dlansky@...eaurora.org>,
        Ahmad Masri <amasri@...eaurora.org>,
        Alexei Avshalom Lazar <ailizaro@...eaurora.org>,
        Tzahi Sabo <stzahi@...eaurora.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Lior David <liord@...eaurora.org>,
        linux-wireless@...r.kernel.org, wil6210@....qualcomm.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] wil6210: avoid gcc-10 zero-length-bounds warning

gcc-10 warns about accesses inside of a zero-length array:

drivers/net/wireless/ath/wil6210/cfg80211.c: In function 'wil_cfg80211_scan':
drivers/net/wireless/ath/wil6210/cfg80211.c:970:23: error: array subscript 255 is outside the bounds of an interior zero-length array 'struct <anonymous>[0]' [-Werror=zero-length-bounds]
  970 |   cmd.cmd.channel_list[cmd.cmd.num_channels++].channel = ch - 1;
      |   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from drivers/net/wireless/ath/wil6210/wil6210.h:17,
                 from drivers/net/wireless/ath/wil6210/cfg80211.c:11:
drivers/net/wireless/ath/wil6210/wmi.h:477:4: note: while referencing 'channel_list'
  477 |  } channel_list[0];
      |    ^~~~~~~~~~~~

Turn this into a flexible array to avoid the warning.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
Gustavo has a patch to do it for all arrays in this file, and that
should get merged as well, but this simpler patch is sufficient
to shut up the warning.
---
 drivers/net/wireless/ath/wil6210/wmi.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/wil6210/wmi.h b/drivers/net/wireless/ath/wil6210/wmi.h
index e3558136e0c4..5bba45c1de48 100644
--- a/drivers/net/wireless/ath/wil6210/wmi.h
+++ b/drivers/net/wireless/ath/wil6210/wmi.h
@@ -474,7 +474,7 @@ struct wmi_start_scan_cmd {
 	struct {
 		u8 channel;
 		u8 reserved;
-	} channel_list[0];
+	} channel_list[];
 } __packed;
 
 #define WMI_MAX_PNO_SSID_NUM	(16)
-- 
2.26.0