linux-kernel - Re: [syzbot] [kernfs?] possible deadlock in walk

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Message-ID: <20250203083954.2020-1-hdanton@sina.com>
Date: Mon,  3 Feb 2025 16:39:53 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+b4567a8b2d2ad5f9dd06@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [kernfs?] possible deadlock in walk_component (4)

On Sun, 02 Feb 2025 10:56:26 -0800
> syzbot has found a reproducer for the following issue on:
> 
> hEAD commit:    69e858e0b8b2 Merge tag 'uml-for-linus-6.14-rc1' of git://g..
> git tree:       upstream
> c reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15bf03df980000

#syz test

--- x/net/mac80211/rate.c
+++ y/net/mac80211/rate.c
@@ -217,7 +217,6 @@ ieee80211_rate_control_ops_get(const cha
 	const struct rate_control_ops *ops;
 	const char *alg_name;
 
-	kernel_param_lock(THIS_MODULE);
 	if (!name)
 		alg_name = ieee80211_default_rc_algo;
 	else
@@ -233,8 +232,6 @@ ieee80211_rate_control_ops_get(const cha
 		/* try built-in one if specific alg requested but not found */
 		ops = ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT);
 
-	kernel_param_unlock(THIS_MODULE);
-
 	return ops;
 }
 
--