[PATCH 6.6.y 6/7] Bluetooth: eir: Fix possible crashes on eir_create_adv_data
Sasha Levin <[email protected]>
| Newsgroups | org.kernel.vger.stable |
|---|---|
| Message-ID | <[email protected]> |
From: Luiz Augusto von Dentz <[email protected]> [ Upstream commit 47c03902269aff377f959dc3fd94a9733aa31d6e ] 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: 01ce70b0a274 ("Bluetooth: eir: Move EIR/Adv Data functions to its own file") Signed-off-by: Luiz Augusto von Dentz <[email protected]> Stable-dep-of: cdc36db204ff ("Bluetooth: hci_sync: Fix advertising data UAFs") Signed-off-by: Sasha Levin <[email protected]> --- net/bluetooth/eir.c | 7 ++++--- net/bluetooth/eir.h | 2 +- net/bluetooth/hci_sync.c | 5 +++-- 3 files changed, 8 insertions(+), 6 deletions(-) diff --git a/net/bluetooth/eir.c b/net/bluetooth/eir.c index 3e1713673ecc9..3f72111ba651f 100644 --- a/net/bluetooth/eir.c +++ b/net/bluetooth/eir.c @@ -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 @@ u8 eir_create_adv_data(struct hci_dev *hdev, u8 instance, u8 *ptr) } /* 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; diff --git a/net/bluetooth/eir.h b/net/bluetooth/eir.h index 0df19f2f4af94..4497f8fd5fefb 100644 --- a/net/bluetooth/eir.h +++ b/net/bluetooth/eir.h @@ -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); diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c index 57756cd615acf..a947738ed50df 100644 --- a/net/bluetooth/hci_sync.c +++ b/net/bluetooth/hci_sync.c @@ -1308,7 +1308,8 @@ 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; @@ -1339,7 +1340,7 @@ 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 && -- 2.53.0