linux-kernel - [Linux-kernel-mentees] [PATCH v2] Bluetooth: Fix memory leak in read_adv_mon

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Date:   Wed,  9 Sep 2020 03:25:51 -0400
From:   Peilin Ye <yepeilin.cs@...il.com>
To:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>
Cc:     Peilin Ye <yepeilin.cs@...il.com>,
        Miao-chen Chou <mcchou@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        syzkaller-bugs@...glegroups.com
Subject: [Linux-kernel-mentees] [PATCH v2] Bluetooth: Fix memory leak in read_adv_mon_features()

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@...kaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?extid=f7f6e564f4202d8601c6
Signed-off-by: Peilin Ye <yepeilin.cs@...il.com>
---
I forgot the "Link:" tag yesterday. Sorry about that.

Change in v2:
    - add a proper "Link:" tag.

 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