6.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Johan Hovold <johan+linaro@xxxxxxxxxx>
commit 2e4edfa1e2bd821a317e7d006517dcf2f3fac68d upstream.
Add the missing sanity checks when parsing the firmware files before
downloading them to avoid accessing and corrupting memory beyond the
vmalloced buffer.
Fixes: 83e81961ff7e ("Bluetooth: btqca: Introduce generic QCA ROME support")
Cc: stable@xxxxxxxxxxxxxxx # 4.10
Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/bluetooth/btqca.c | 38 ++++++++++++++++++++++++++++++++------
1 file changed, 32 insertions(+), 6 deletions(-)
--- a/drivers/bluetooth/btqca.c
+++ b/drivers/bluetooth/btqca.c
@@ -268,9 +268,10 @@ int qca_send_pre_shutdown_cmd(struct hci
}
EXPORT_SYMBOL_GPL(qca_send_pre_shutdown_cmd);
-static void qca_tlv_check_data(struct hci_dev *hdev,
+static int qca_tlv_check_data(struct hci_dev *hdev,
struct qca_fw_config *config,
- u8 *fw_data, enum qca_btsoc_type soc_type)
+ u8 *fw_data, size_t fw_size,
+ enum qca_btsoc_type soc_type)
{
const u8 *data;
u32 type_len;
@@ -286,6 +287,9 @@ static void qca_tlv_check_data(struct hc
switch (config->type) {
case ELF_TYPE_PATCH:
+ if (fw_size < 7)
+ return -EINVAL;
+
config->dnld_mode = QCA_SKIP_EVT_VSE_CC;
config->dnld_type = QCA_SKIP_EVT_VSE_CC;
@@ -294,6 +298,9 @@ static void qca_tlv_check_data(struct hc
bt_dev_dbg(hdev, "File version : 0x%x", fw_data[6]);
break;
case TLV_TYPE_PATCH:
+ if (fw_size < sizeof(struct tlv_type_hdr) + sizeof(struct tlv_type_patch))
+ return -EINVAL;
+
tlv = (struct tlv_type_hdr *)fw_data;
type_len = le32_to_cpu(tlv->type_len);
tlv_patch = (struct tlv_type_patch *)tlv->data;
@@ -333,6 +340,9 @@ static void qca_tlv_check_data(struct hc
break;
case TLV_TYPE_NVM:
+ if (fw_size < sizeof(struct tlv_type_hdr))
+ return -EINVAL;
+
tlv = (struct tlv_type_hdr *)fw_data;
type_len = le32_to_cpu(tlv->type_len);
@@ -341,17 +351,26 @@ static void qca_tlv_check_data(struct hc
BT_DBG("TLV Type\t\t : 0x%x", type_len & 0x000000ff);
BT_DBG("Length\t\t : %d bytes", length);
+ if (fw_size < length + (tlv->data - fw_data))
+ return -EINVAL;
+
idx = 0;
data = tlv->data;
- while (idx < length) {
+ while (idx < length - sizeof(struct tlv_type_nvm)) {
tlv_nvm = (struct tlv_type_nvm *)(data + idx);
tag_id = le16_to_cpu(tlv_nvm->tag_id);
tag_len = le16_to_cpu(tlv_nvm->tag_len);
+ if (length < idx + sizeof(struct tlv_type_nvm) + tag_len)
+ return -EINVAL;
+
/* Update NVM tags as needed */
switch (tag_id) {
case EDL_TAG_ID_HCI:
+ if (tag_len < 3)
+ return -EINVAL;
+
/* HCI transport layer parameters
* enabling software inband sleep
* onto controller side.
@@ -367,6 +386,9 @@ static void qca_tlv_check_data(struct hc
break;
case EDL_TAG_ID_DEEP_SLEEP:
+ if (tag_len < 1)
+ return -EINVAL;
+
/* Sleep enable mask
* enabling deep sleep feature on controller.
*/
@@ -375,14 +397,16 @@ static void qca_tlv_check_data(struct hc
break;
}
- idx += (sizeof(u16) + sizeof(u16) + 8 + tag_len);
+ idx += sizeof(struct tlv_type_nvm) + tag_len;
}
break;
default:
BT_ERR("Unknown TLV type %d", config->type);
- break;
+ return -EINVAL;
}
+
+ return 0;
}
static int qca_tlv_send_segment(struct hci_dev *hdev, int seg_size,
@@ -532,7 +556,9 @@ static int qca_download_firmware(struct
memcpy(data, fw->data, size);
release_firmware(fw);
- qca_tlv_check_data(hdev, config, data, soc_type);
+ ret = qca_tlv_check_data(hdev, config, data, size, soc_type);
+ if (ret)
+ return ret;
segment = data;
remain = size;
