Re: [syzbot] [PATCH] Test uaf in sco_sock_timeout

[syzbot <syzbot+4c0d0c4cde787116d465@syzkaller.appspotmail.com>]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: [PATCH] Test uaf in sco_sock_timeout
Author: eadavis@qq.com

please test 8de1e7afcc1c

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git 8de1e7afcc1c

diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index c736186aba26..c05fb9d41a63 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -300,7 +300,8 @@ static int sco_connect(struct sock *sk)
 
 unlock:
 	hci_dev_unlock(hdev);
-	hci_dev_put(hdev);
+	if (err)
+		hci_dev_put(hdev);
 	return err;
 }