linux-kernel - [PATCH AUTOSEL 4.4 13/16] Bluetooth: RFCOMM: fix ODEBUG bug in rfcomm_dev

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Message-Id: <20200411231447.27182-13-sashal@kernel.org>
Date:   Sat, 11 Apr 2020 19:14:43 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Qiujun Huang <hqjagain@...il.com>,
        syzbot+4496e82090657320efc6@...kaller.appspotmail.com,
        Hillf Danton <hdanton@...a.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        Sasha Levin <sashal@...nel.org>,
        linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.4 13/16] Bluetooth: RFCOMM: fix ODEBUG bug in rfcomm_dev_ioctl

From: Qiujun Huang <hqjagain@...il.com>

[ Upstream commit 71811cac8532b2387b3414f7cd8fe9e497482864 ]

Needn't call 'rfcomm_dlc_put' here, because 'rfcomm_dlc_exists' didn't
increase dlc->refcnt.

Reported-by: syzbot+4496e82090657320efc6@...kaller.appspotmail.com
Signed-off-by: Qiujun Huang <hqjagain@...il.com>
Suggested-by: Hillf Danton <hdanton@...a.com>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/bluetooth/rfcomm/tty.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/net/bluetooth/rfcomm/tty.c b/net/bluetooth/rfcomm/tty.c
index 8e385a0ae60e0..939fbf7b352d4 100644
--- a/net/bluetooth/rfcomm/tty.c
+++ b/net/bluetooth/rfcomm/tty.c
@@ -413,10 +413,8 @@ static int __rfcomm_create_dev(struct sock *sk, void __user *arg)
 		dlc = rfcomm_dlc_exists(&req.src, &req.dst, req.channel);
 		if (IS_ERR(dlc))
 			return PTR_ERR(dlc);
-		else if (dlc) {
-			rfcomm_dlc_put(dlc);
+		if (dlc)
 			return -EBUSY;
-		}
 		dlc = rfcomm_dlc_alloc(GFP_KERNEL);
 		if (!dlc)
 			return -ENOMEM;
-- 
2.20.1