Set a size limit of 8 bytes of the written buffer to "hdev->name"
including the terminating null byte, as the size of "hdev->name" is 8
bytes. If an id value which is greater than 9999 is allocated,
then the "snprintf(hdev->name, sizeof(hdev->name), "hci%d", id)"
function call would lead to a truncation of the id value in decimal
notation.
Set an explicit maximum id parameter in the id allocation function call.
The id allocation function defines the maximum allocated id value as the
maximum id parameter value minus one. Therefore, HCI_MAX_ID is defined
as 10000.
Signed-off-by: Itay Iellin <ieitayie@xxxxxxxxx>
---
include/net/bluetooth/hci_core.h | 3 +++
net/bluetooth/hci_core.c | 6 +++---
2 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 64d3a63759a8..5a52a2018b56 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -36,6 +36,9 @@
/* HCI priority */
#define HCI_PRIO_MAX 7
+/* HCI maximum id value */
+#define HCI_MAX_ID 10000
+
/* HCI Core structures */
struct inquiry_data {
bdaddr_t bdaddr;
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index ad4f4ab0afca..5abb2ca5b129 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -2555,10 +2555,10 @@ int hci_register_dev(struct hci_dev *hdev)
*/
switch (hdev->dev_type) {
case HCI_PRIMARY:
- id = ida_simple_get(&hci_index_ida, 0, 0, GFP_KERNEL);
+ id = ida_simple_get(&hci_index_ida, 0, HCI_MAX_ID, GFP_KERNEL);
break;
case HCI_AMP:
- id = ida_simple_get(&hci_index_ida, 1, 0, GFP_KERNEL);
+ id = ida_simple_get(&hci_index_ida, 1, HCI_MAX_ID, GFP_KERNEL);
break;
default:
return -EINVAL;
@@ -2567,7 +2567,7 @@ int hci_register_dev(struct hci_dev *hdev)
if (id < 0)
return id;
- sprintf(hdev->name, "hci%d", id);
+ snprintf(hdev->name, sizeof(hdev->name), "hci%d", id);
hdev->id = id;
BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
--
2.30.2
