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

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Message-Id: <20240410225258.631-1-hdanton@sina.com>
Date: Thu, 11 Apr 2024 06:52:58 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+38b3aa8cd529958bd27a@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] possible deadlock in unix_notinflight

On Wed, 10 Apr 2024 11:45:29 -0700
> syzbot found the following issue on:
> 
> HEAD commit:    443574b03387 riscv, bpf: Fix kfunc parameters incompatibil..
> git tree:       bpf
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11aee305180000

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git  443574b03387

--- x/net/unix/garbage.c
+++ y/net/unix/garbage.c
@@ -327,7 +327,7 @@ static void __unix_gc(struct work_struct
 
 #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
--