[Linux-kernel-mentees] [PATCH 1/2] net/bluetooth: Prevent out-of-bounds read in hci_inquiry_result_evt()

Peilin Ye yepeilin.cs at gmail.com
Fri Jul 10 21:39:18 UTC 2020


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

Cc: stable at vger.kernel.org
Signed-off-by: Peilin Ye <yepeilin.cs at gmail.com>
---
 net/bluetooth/hci_event.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 03a0759f2fc2..8b3736c83b8e 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -2517,7 +2517,7 @@ static void hci_inquiry_result_evt(struct hci_dev *hdev, struct sk_buff *skb)
 
 	BT_DBG("%s num_rsp %d", hdev->name, num_rsp);
 
-	if (!num_rsp)
+	if (!num_rsp || skb->len < num_rsp * sizeof(*info) + 1)
 		return;
 
 	if (hci_dev_test_flag(hdev, HCI_PERIODIC_INQ))
-- 
2.25.1



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