linux-kernel - [PATCH v2] wireless/nl80211.c: fix uninitialized variable

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Date:   Tue, 30 Mar 2021 18:37:05 +0200
From:   Alaa Emad <alaaemadhossney.ae@...il.com>
To:     johannes@...solutions.net, davem@...emloft.net, kuba@...nel.org
Cc:     gregkh@...uxfoundation.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller@...glegroups.com,
        Alaa Emad <alaaemadhossney.ae@...il.com>,
        syzbot+72b99dcf4607e8c770f3@...kaller.appspotmail.com
Subject: [PATCH v2] wireless/nl80211.c: fix uninitialized variable

This change fix  KMSAN uninit-value in net/wireless/nl80211.c:225 , That
because of `fixedlen` variable uninitialized,So I initialized it by zero.

Reported-by: syzbot+72b99dcf4607e8c770f3@...kaller.appspotmail.com
Signed-off-by: Alaa Emad <alaaemadhossney.ae@...il.com>
---
Changes in v2:
  - Make the commit message more clearer.
---
 net/wireless/nl80211.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 775d0c4d86c3..b87ab67ad33d 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -210,7 +210,7 @@ static int validate_beacon_head(const struct nlattr *attr,
 	const struct element *elem;
 	const struct ieee80211_mgmt *mgmt = (void *)data;
 	bool s1g_bcn = ieee80211_is_s1g_beacon(mgmt->frame_control);
-	unsigned int fixedlen, hdrlen;
+	unsigned int fixedlen = 0 , hdrlen;
 
 	if (s1g_bcn) {
 		fixedlen = offsetof(struct ieee80211_ext,
-- 
2.25.1