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Bluetooth: Fix slab-out-of-bounds read in hci_extended_inquiry_result_evt() 

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=4bf11aa05c4ca51ce0df86e500fce486552dc8d2

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>
This commit is contained in:
Peilin Ye 2020-07-10 12:09:15 -04:00 committed by Marcel Holtmann
parent 51b64c476a
commit 51c19bf3d5
1 changed files with 1 additions and 1 deletions
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2
net/bluetooth/hci_event.c
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@ -4375,7 +4375,7 @@ static void hci_extended_inquiry_result_evt(struct hci_dev *hdev,
BT_DBG("%s num_rsp %d", hdev->name, num_rsp); BT_DBG("%s num_rsp %d", hdev->name, num_rsp);
if (!num_rsp) if (!num_rsp || skb->len < num_rsp * sizeof(*info) + 1)
return; return;
if (hci_dev_test_flag(hdev, HCI_PERIODIC_INQ)) if (hci_dev_test_flag(hdev, HCI_PERIODIC_INQ))