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Bluetooth: eir: Fix using strlen with hdev->{dev_name,short_name} 

Both dev_name and short_name are not guaranteed to be NULL terminated so
this instead use strnlen and then attempt to determine if the resulting
string needs to be truncated or not.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=216018
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Luiz Augusto von Dentz 2022-05-24 13:02:45 -07:00
parent a5133fe87e
commit dd7b8cdde0
2 changed files with 28 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
net/bluetooth/eir.c
View File

@ -13,6 +13,20 @@
#define PNP_INFO_SVCLASS_ID 0x1200
static u8 eir_append_name(u8 *eir, u16 eir_len, u8 type, u8 *data, u8 data_len)
{
u8 name[HCI_MAX_SHORT_NAME_LENGTH + 1];
/* If data is already NULL terminated just pass it directly */
if (data[data_len - 1] == '\0')
return eir_append_data(eir, eir_len, type, data, data_len);
memcpy(name, data, HCI_MAX_SHORT_NAME_LENGTH);
name[HCI_MAX_SHORT_NAME_LENGTH] = '\0';
return eir_append_data(eir, eir_len, type, name, sizeof(name));
}
u8 eir_append_local_name(struct hci_dev *hdev, u8 *ptr, u8 ad_len)
{
size_t short_len;
@ -23,29 +37,26 @@ u8 eir_append_local_name(struct hci_dev *hdev, u8 *ptr, u8 ad_len)
return ad_len;
/* use complete name if present and fits */
complete_len = strlen(hdev->dev_name);
complete_len = strnlen(hdev->dev_name, sizeof(hdev->dev_name));
if (complete_len && complete_len <= HCI_MAX_SHORT_NAME_LENGTH)
return eir_append_data(ptr, ad_len, EIR_NAME_COMPLETE,
return eir_append_name(ptr, ad_len, EIR_NAME_COMPLETE,
hdev->dev_name, complete_len + 1);
/* use short name if present */
short_len = strlen(hdev->short_name);
short_len = strnlen(hdev->short_name, sizeof(hdev->short_name));
if (short_len)
return eir_append_data(ptr, ad_len, EIR_NAME_SHORT,
hdev->short_name, short_len + 1);
return eir_append_name(ptr, ad_len, EIR_NAME_SHORT,
hdev->short_name,
short_len == HCI_MAX_SHORT_NAME_LENGTH ?
short_len : short_len + 1);
/* use shortened full name if present, we already know that name
* is longer then HCI_MAX_SHORT_NAME_LENGTH
*/
if (complete_len) {
u8 name[HCI_MAX_SHORT_NAME_LENGTH + 1];
memcpy(name, hdev->dev_name, HCI_MAX_SHORT_NAME_LENGTH);
name[HCI_MAX_SHORT_NAME_LENGTH] = '\0';
return eir_append_data(ptr, ad_len, EIR_NAME_SHORT, name,
sizeof(name));
}
if (complete_len)
return eir_append_name(ptr, ad_len, EIR_NAME_SHORT,
hdev->dev_name,
HCI_MAX_SHORT_NAME_LENGTH);
return ad_len;
}
@ -181,7 +192,7 @@ void eir_create(struct hci_dev *hdev, u8 *data)
u8 *ptr = data;
size_t name_len;
name_len = strlen(hdev->dev_name);
name_len = strnlen(hdev->dev_name, sizeof(hdev->dev_name));
if (name_len > 0) {
/* EIR Data type */

4
net/bluetooth/mgmt.c
View File

@ -1082,11 +1082,11 @@ static u16 append_eir_data_to_buf(struct hci_dev *hdev, u8 *eir)
eir_len = eir_append_le16(eir, eir_len, EIR_APPEARANCE,
hdev->appearance);
name_len = strlen(hdev->dev_name);
name_len = strnlen(hdev->dev_name, sizeof(hdev->dev_name));
eir_len = eir_append_data(eir, eir_len, EIR_NAME_COMPLETE,
hdev->dev_name, name_len);
name_len = strlen(hdev->short_name);
name_len = strnlen(hdev->short_name, sizeof(hdev->short_name));
eir_len = eir_append_data(eir, eir_len, EIR_NAME_SHORT,
hdev->short_name, name_len);