linux-kernel - Re: [syzbot] [fs?] [wireless?] general protection fault in simple_recursive

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Message-ID: <20250724022251.2875-1-hdanton@sina.com>
Date: Thu, 24 Jul 2025 10:22:44 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+d6ccd49ae046542a0641@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [fs?] [wireless?] general protection fault in simple_recursive_removal (5)

> Date: Wed, 23 Jul 2025 10:19:28 -0700	[thread overview]
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    89be9a83ccf1 Linux 6.16-rc7
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=11b42fd4580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=8adfe52da0de2761
> dashboard link: https://syzkaller.appspot.com/bug?extid=d6ccd49ae046542a0641
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=134baf22580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16d5a4f0580000

#syz test

--- x/net/mac80211/debugfs_sta.c
+++ y/net/mac80211/debugfs_sta.c
@@ -1276,6 +1276,8 @@ void ieee80211_sta_debugfs_add(struct st
 
 void ieee80211_sta_debugfs_remove(struct sta_info *sta)
 {
+	if (!sta->debugfs_dir)
+		return;
 	debugfs_remove_recursive(sta->debugfs_dir);
 	sta->debugfs_dir = NULL;
 }
--