linux-kernel - Forwarded: Re: [syzbot] [nbd?] KASAN: slab-use-after-free Write in recv

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Message-ID: <69080f0e.050a0220.29fc44.002f.GAE@google.com>
Date: Sun, 02 Nov 2025 18:10:22 -0800
From: syzbot <syzbot+56fbf4c7ddf65e95c7cc@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Forwarded: Re: [syzbot] [nbd?] KASAN: slab-use-after-free Write in
 recv_work (3)

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Subject: Re: [syzbot] [nbd?] KASAN: slab-use-after-free Write in recv_work (3)
Author: lizhi.xu@...driver.com

#syz test

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index a853c65ac65d..215fc18115b7 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -1024,9 +1024,9 @@ static void recv_work(struct work_struct *work)
 	nbd_mark_nsock_dead(nbd, nsock, 1);
 	mutex_unlock(&nsock->tx_lock);
 
-	nbd_config_put(nbd);
 	atomic_dec(&config->recv_threads);
 	wake_up(&config->recv_wq);
+	nbd_config_put(nbd);
 	kfree(args);
 }