linux-kernel - Re: [syzbot] [net?] possible deadlock in unix_del

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Date: Fri,  5 Apr 2024 07:56:38 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+7f7f201cc2668a8fd169@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] possible deadlock in unix_del_edges

On Thu, 04 Apr 2024 09:13:26 -0700
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    2b3d5988ae2c Add linux-next specific files for 20240404
> git tree:       linux-next
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1133aaa9180000

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git  2b3d5988ae2c

--- x/net/unix/garbage.c
+++ y/net/unix/garbage.c
@@ -358,7 +358,7 @@ static void unix_collect_skb(struct list
 
 #if IS_ENABLED(CONFIG_AF_UNIX_OOB)
 			if (u->oob_skb) {
-				kfree_skb(u->oob_skb);
+				__skb_queue_tail(hitlist, u->oob_skb);
 				u->oob_skb = NULL;
 			}
 #endif
--