netdev - [Linux-kernel-mentees] [PATCH 2/2] net/bluetooth: Prevent out-of-bounds read in hci_inquiry_result_with_rssi

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Date:   Fri, 10 Jul 2020 17:45:26 -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>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Greg KH <gregkh@...uxfoundation.org>,
        linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-kernel@...r.kernel.org
Subject: [Linux-kernel-mentees] [PATCH 2/2] net/bluetooth: Prevent out-of-bounds read in hci_inquiry_result_with_rssi_evt()

Check `num_rsp` before using it as for-loop counter. Add `unlock` label.

Cc: stable@...r.kernel.org
Signed-off-by: Peilin Ye <yepeilin.cs@...il.com>
---
 net/bluetooth/hci_event.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 8b3736c83b8e..f9f4262414b3 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -4159,6 +4159,9 @@ static void hci_inquiry_result_with_rssi_evt(struct hci_dev *hdev,
 		struct inquiry_info_with_rssi_and_pscan_mode *info;
 		info = (void *) (skb->data + 1);
 
+		if (skb->len < num_rsp * sizeof(*info) + 1)
+			goto unlock;
+
 		for (; num_rsp; num_rsp--, info++) {
 			u32 flags;
 
@@ -4180,6 +4183,9 @@ static void hci_inquiry_result_with_rssi_evt(struct hci_dev *hdev,
 	} else {
 		struct inquiry_info_with_rssi *info = (void *) (skb->data + 1);
 
+		if (skb->len < num_rsp * sizeof(*info) + 1)
+			goto unlock;
+
 		for (; num_rsp; num_rsp--, info++) {
 			u32 flags;
 
@@ -4200,6 +4206,7 @@ static void hci_inquiry_result_with_rssi_evt(struct hci_dev *hdev,
 		}
 	}
 
+unlock:
 	hci_dev_unlock(hdev);
 }
 
-- 
2.25.1