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Bluetooth: Prevent out-of-bounds read in hci_inquiry_result_with_rssi_evt()

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

Cc: stable@vger.kernel.org
Signed-off-by: Peilin Ye <yepeilin.cs@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Peilin Ye 2020-07-10 17:45:26 -04:00 committed by Marcel Holtmann
parent 75bbd2ea50
commit 629b49c848
1 changed files with 7 additions and 0 deletions
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7
net/bluetooth/hci_event.c
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@ -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);
}