linux-kernel - [PATCH] bluetooth/rfcomm: fix ODEBUG bug in rfcomm_dev

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Message-Id: <1583589488-22450-1-git-send-email-hqjagain@gmail.com>
Date:   Sat,  7 Mar 2020 21:58:08 +0800
From:   Qiujun Huang <hqjagain@...il.com>
To:     marcel@...tmann.org
Cc:     johan.hedberg@...il.com, davem@...emloft.net, kuba@...nel.org,
        linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Qiujun Huang <hqjagain@...il.com>
Subject: [PATCH] bluetooth/rfcomm: fix ODEBUG bug in rfcomm_dev_ioctl

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>
---
 net/bluetooth/rfcomm/tty.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/net/bluetooth/rfcomm/tty.c b/net/bluetooth/rfcomm/tty.c
index 0c7d31c..ea2a1df0 100644
--- a/net/bluetooth/rfcomm/tty.c
+++ b/net/bluetooth/rfcomm/tty.c
@@ -414,7 +414,6 @@ static int __rfcomm_create_dev(struct sock *sk, void __user *arg)
 		if (IS_ERR(dlc))
 			return PTR_ERR(dlc);
 		else if (dlc) {
-			rfcomm_dlc_put(dlc);
 			return -EBUSY;
 		}
 		dlc = rfcomm_dlc_alloc(GFP_KERNEL);
-- 
1.8.3.1