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Code

Bluetooth: eir: Fix possible crashes on eir_create_adv_data

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eir_create_adv_data may attempt to add EIR_FLAGS and EIR_TX_POWER
without checking if that would fit.

Link: https://github.com/bluez/bluez/issues/1117#issuecomment-2958244066
Fixes: 01ce70b0a2 ("Bluetooth: eir: Move EIR/Adv Data functions to its own file")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Luiz Augusto von Dentz 2025-06-10 10:14:35 -04:00
parent 5725bc6082
commit 47c0390226
3 changed files with 8 additions and 6 deletions
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7
net/bluetooth/eir.c
View File

@ -242,7 +242,7 @@ u8 eir_create_per_adv_data(struct hci_dev *hdev, u8 instance, u8 *ptr)
return ad_len;
}
u8 eir_create_adv_data(struct hci_dev *hdev, u8 instance, u8 *ptr)
u8 eir_create_adv_data(struct hci_dev *hdev, u8 instance, u8 *ptr, u8 size)
{
struct adv_info *adv = NULL;
u8 ad_len = 0, flags = 0;
@ -286,7 +286,7 @@ u8 eir_create_adv_data(struct hci_dev *hdev, u8 instance, u8 *ptr)
/* If flags would still be empty, then there is no need to
* include the "Flags" AD field".
*/
if (flags) {
if (flags && (ad_len + eir_precalc_len(1) <= size)) {
ptr[0] = 0x02;
ptr[1] = EIR_FLAGS;
ptr[2] = flags;
@ -316,7 +316,8 @@ skip_flags:
}
/* Provide Tx Power only if we can provide a valid value for it */
if (adv_tx_power != HCI_TX_POWER_INVALID) {
if (adv_tx_power != HCI_TX_POWER_INVALID &&
(ad_len + eir_precalc_len(1) <= size)) {
ptr[0] = 0x02;
ptr[1] = EIR_TX_POWER;
ptr[2] = (u8)adv_tx_power;

2
net/bluetooth/eir.h
View File

@ -9,7 +9,7 @@
void eir_create(struct hci_dev *hdev, u8 *data);
u8 eir_create_adv_data(struct hci_dev *hdev, u8 instance, u8 *ptr);
u8 eir_create_adv_data(struct hci_dev *hdev, u8 instance, u8 *ptr, u8 size);
u8 eir_create_scan_rsp(struct hci_dev *hdev, u8 instance, u8 *ptr);
u8 eir_create_per_adv_data(struct hci_dev *hdev, u8 instance, u8 *ptr);

5
net/bluetooth/hci_sync.c
View File

@ -1822,7 +1822,8 @@ static int hci_set_ext_adv_data_sync(struct hci_dev *hdev, u8 instance)
return 0;
}
len = eir_create_adv_data(hdev, instance, pdu->data);
len = eir_create_adv_data(hdev, instance, pdu->data,
HCI_MAX_EXT_AD_LENGTH);
pdu->length = len;
pdu->handle = adv ? adv->handle : instance;
@ -1853,7 +1854,7 @@ static int hci_set_adv_data_sync(struct hci_dev *hdev, u8 instance)
memset(&cp, 0, sizeof(cp));
len = eir_create_adv_data(hdev, instance, cp.data);
len = eir_create_adv_data(hdev, instance, cp.data, sizeof(cp.data));
/* There's nothing to do if the data hasn't changed */
if (hdev->adv_data_len == len &&