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From:   Peilin Ye <yepeilin.cs@gmail.com>
To:     Marcel Holtmann <marcel@holtmann.org>,
        Johan Hedberg <johan.hedberg@gmail.com>
Cc:     Peilin Ye <yepeilin.cs@gmail.com>,
        Miao-chen Chou <mcchou@chromium.org>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-kernel-mentees@lists.linuxfoundation.org,
        syzkaller-bugs@googlegroups.com
Subject: [Linux-kernel-mentees] [PATCH] Bluetooth: Fix memory leak in read_adv_mon_features()
Date:   Tue,  8 Sep 2020 16:06:35 -0400
Message-Id: <20200908200635.1099360-1-yepeilin.cs@gmail.com>
In-Reply-To: <00000000000033913705acedbd6b@google.com>
References: <00000000000033913705acedbd6b@google.com>
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Sender: linux-bluetooth-owner@vger.kernel.org
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read_adv_mon_features() is leaking memory. Free `rp` before returning.

Fixes: e5e1e7fd470c ("Bluetooth: Add handler of MGMT_OP_READ_ADV_MONITOR_FEATURES")
Reported-and-tested-by: syzbot+f7f6e564f4202d8601c6@syzkaller.appspotmail.com
Signed-off-by: Peilin Ye <yepeilin.cs@gmail.com>
---
 net/bluetooth/mgmt.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 5bbe71002fb9..f96251f818fc 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -4157,7 +4157,7 @@ static int read_adv_mon_features(struct sock *sk, struct hci_dev *hdev,
 {
 	struct adv_monitor *monitor = NULL;
 	struct mgmt_rp_read_adv_monitor_features *rp = NULL;
-	int handle;
+	int handle, err;
 	size_t rp_size = 0;
 	__u32 supported = 0;
 	__u16 num_handles = 0;
@@ -4192,9 +4192,13 @@ static int read_adv_mon_features(struct sock *sk, struct hci_dev *hdev,
 	if (num_handles)
 		memcpy(&rp->handles, &handles, (num_handles * sizeof(u16)));
 
-	return mgmt_cmd_complete(sk, hdev->id,
-				 MGMT_OP_READ_ADV_MONITOR_FEATURES,
-				 MGMT_STATUS_SUCCESS, rp, rp_size);
+	err = mgmt_cmd_complete(sk, hdev->id,
+				MGMT_OP_READ_ADV_MONITOR_FEATURES,
+				MGMT_STATUS_SUCCESS, rp, rp_size);
+
+	kfree(rp);
+
+	return err;
 }
 
 static int add_adv_patterns_monitor(struct sock *sk, struct hci_dev *hdev,
-- 
2.25.1