linux-kernel - [PATCH] staging: wlan-ng: Use flexible-array for one / zero-length arrays

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Date:   Fri, 28 Oct 2022 18:08:13 +0530
From:   Deepak R Varma <drv@...lo.com>
To:     outreachy@...ts.linux.dev,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH] staging: wlan-ng: Use flexible-array for one / zero-length
 arrays

Flexible-array member should be used instead of one or zero member to
meet the need for having a dynamically sized trailing elements in a
structure. Refer to links [1] and [2] for detailed guidance on this
suggestion.

[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

Issue identified using coccicheck.

Signed-off-by: Deepak R Varma <drv@...lo.com>
---
 drivers/staging/wlan-ng/p80211mgmt.h  | 8 ++++----
 drivers/staging/wlan-ng/p80211types.h | 2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/wlan-ng/p80211mgmt.h b/drivers/staging/wlan-ng/p80211mgmt.h
index 1ef30d3f3159..d6fe52de2c8f 100644
--- a/drivers/staging/wlan-ng/p80211mgmt.h
+++ b/drivers/staging/wlan-ng/p80211mgmt.h
@@ -229,14 +229,14 @@ struct wlan_ie {
 struct wlan_ie_ssid {
 	u8 eid;
 	u8 len;
-	u8 ssid[1];		/* may be zero, ptrs may overlap */
+	u8 ssid[];		/* may be zero, ptrs may overlap */
 } __packed;

 /*-- Supported Rates  -----------------------------*/
 struct wlan_ie_supp_rates {
 	u8 eid;
 	u8 len;
-	u8 rates[1];		/* had better be at LEAST one! */
+	u8 rates[];		/* had better be at LEAST one! */
 } __packed;

 /*-- FH Parameter Set  ----------------------------*/
@@ -274,7 +274,7 @@ struct wlan_ie_tim {
 	u8 dtim_cnt;
 	u8 dtim_period;
 	u8 bitmap_ctl;
-	u8 virt_bm[1];
+	u8 virt_bm[];
 } __packed;

 /*-- IBSS Parameter Set ---------------------------*/
@@ -288,7 +288,7 @@ struct wlan_ie_ibss_parms {
 struct wlan_ie_challenge {
 	u8 eid;
 	u8 len;
-	u8 challenge[1];
+	u8 challenge[];
 } __packed;

 /*-------------------------------------------------*/
diff --git a/drivers/staging/wlan-ng/p80211types.h b/drivers/staging/wlan-ng/p80211types.h
index 6486612a8f31..b2ffd09881b0 100644
--- a/drivers/staging/wlan-ng/p80211types.h
+++ b/drivers/staging/wlan-ng/p80211types.h
@@ -234,7 +234,7 @@ struct p80211pstr32 {
 /* MAC address array */
 struct p80211macarray {
 	u32 cnt;
-	u8 data[1][MAXLEN_PSTR6];
+	u8 data[][MAXLEN_PSTR6];
 } __packed;

 /* prototype template */
--
2.34.1