From: Peilin Ye yepeilin.cs@gmail.com
commit 51c19bf3d5cfaa66571e4b88ba2a6f6295311101 upstream.
Check upon `num_rsp` is insufficient. A malformed event packet with a large `num_rsp` number makes hci_extended_inquiry_result_evt() go out of bounds. Fix it.
This patch fixes the following syzbot bug:
https://syzkaller.appspot.com/bug?id=4bf11aa05c4ca51ce0df86e500fce486552dc8d...
Reported-by: syzbot+d8489a79b781849b9c46@syzkaller.appspotmail.com Cc: stable@vger.kernel.org Signed-off-by: Peilin Ye yepeilin.cs@gmail.com Acked-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Marcel Holtmann marcel@holtmann.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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 cdb92b129906..59899dbf742d 100644 --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -4151,7 +4151,7 @@ static void hci_extended_inquiry_result_evt(struct hci_dev *hdev,
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))