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Bluetooth: btmtk: Fix short read errors in btmtk_usb_uhw_reg_read()

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If btmtk_usb_uhw_reg_read() gets a "short" read from a device, it will
accidentally treat that as a "real" read and populate the returned value
with some unknown and probably totally invalid data.

Fix this logic error up by calling usb_control_msg_recv() which
guarantees a "full" read happens, and then simplify the error checking
for when btmtk_usb_uhw_reg_read() is called.

Note, one caller of btmtk_usb_uhw_reg_read() does not check the return
value, but as we pre-initialize the return value as 0, an incorrect read
will not do anything wrong.

Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Greg Kroah-Hartman 2026-07-27 17:57:32 +02:00 committed by Luiz Augusto von Dentz
parent c0a9dcd2be
commit b186c18c48
1 changed files with 22 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
drivers/bluetooth/btmtk.c
View File

@ -804,30 +804,24 @@ static int btmtk_usb_uhw_reg_write(struct hci_dev *hdev, u32 reg, u32 val)
static int btmtk_usb_uhw_reg_read(struct hci_dev *hdev, u32 reg, u32 *val)
{
struct btmtk_data *data = hci_get_priv(hdev);
int pipe, err;
void *buf;
u8 buf[sizeof(u32)];
int err;
buf = kzalloc(4, GFP_KERNEL);
if (!buf)
return -ENOMEM;
pipe = usb_rcvctrlpipe(data->udev, 0);
err = usb_control_msg(data->udev, pipe, 0x01,
0xDE,
reg >> 16, reg & 0xffff,
buf, 4, USB_CTRL_GET_TIMEOUT);
if (err < 0) {
*val = 0;
err = usb_control_msg_recv(data->udev, 0, 0x01,
0xDE,
reg >> 16, reg & 0xffff,
buf, sizeof(buf), USB_CTRL_GET_TIMEOUT,
GFP_KERNEL);
if (err) {
bt_dev_err(hdev, "Failed to read uhw reg(%d)", err);
goto err_free_buf;
return err;
}
*val = get_unaligned_le32(buf);
bt_dev_dbg(hdev, "reg=%x, value=0x%08x", reg, *val);
err_free_buf:
kfree(buf);
return err;
return 0;
}
static int btmtk_usb_reg_read(struct hci_dev *hdev, u32 reg, u32 *val)
@ -877,7 +871,7 @@ int btmtk_usb_subsys_reset(struct hci_dev *hdev, u32 dev_id)
if (dev_id == 0x7922) {
err = btmtk_usb_uhw_reg_read(hdev, MTK_BT_SUBSYS_RST, &val);
if (err < 0)
if (err)
return err;
val |= 0x00002020;
err = btmtk_usb_uhw_reg_write(hdev, MTK_BT_SUBSYS_RST, val);
@ -887,7 +881,7 @@ int btmtk_usb_subsys_reset(struct hci_dev *hdev, u32 dev_id)
if (err < 0)
return err;
err = btmtk_usb_uhw_reg_read(hdev, MTK_BT_SUBSYS_RST, &val);
if (err < 0)
if (err)
return err;
val |= BIT(0);
err = btmtk_usb_uhw_reg_write(hdev, MTK_BT_SUBSYS_RST, val);
@ -896,14 +890,14 @@ int btmtk_usb_subsys_reset(struct hci_dev *hdev, u32 dev_id)
msleep(100);
} else if (dev_id == 0x7925 || dev_id == 0x6639) {
err = btmtk_usb_uhw_reg_read(hdev, MTK_BT_RESET_REG_CONNV3, &val);
if (err < 0)
if (err)
return err;
val |= (1 << 5);
err = btmtk_usb_uhw_reg_write(hdev, MTK_BT_RESET_REG_CONNV3, val);
if (err < 0)
return err;
err = btmtk_usb_uhw_reg_read(hdev, MTK_BT_RESET_REG_CONNV3, &val);
if (err < 0)
if (err)
return err;
val &= 0xFFFF00FF;
val |= (1 << 13);
@ -914,7 +908,7 @@ int btmtk_usb_subsys_reset(struct hci_dev *hdev, u32 dev_id)
if (err < 0)
return err;
err = btmtk_usb_uhw_reg_read(hdev, MTK_BT_RESET_REG_CONNV3, &val);
if (err < 0)
if (err)
return err;
val |= (1 << 0);
err = btmtk_usb_uhw_reg_write(hdev, MTK_BT_RESET_REG_CONNV3, val);
@ -924,13 +918,13 @@ int btmtk_usb_subsys_reset(struct hci_dev *hdev, u32 dev_id)
if (err < 0)
return err;
err = btmtk_usb_uhw_reg_read(hdev, MTK_UDMA_INT_STA_BT, &val);
if (err < 0)
if (err)
return err;
err = btmtk_usb_uhw_reg_write(hdev, MTK_UDMA_INT_STA_BT1, 0x000000FF);
if (err < 0)
return err;
err = btmtk_usb_uhw_reg_read(hdev, MTK_UDMA_INT_STA_BT1, &val);
if (err < 0)
if (err)
return err;
msleep(100);
} else {
@ -940,7 +934,7 @@ int btmtk_usb_subsys_reset(struct hci_dev *hdev, u32 dev_id)
if (err < 0)
return err;
err = btmtk_usb_uhw_reg_read(hdev, MTK_BT_WDT_STATUS, &val);
if (err < 0)
if (err)
return err;
/* Reset the bluetooth chip via USB interface. */
err = btmtk_usb_uhw_reg_write(hdev, MTK_BT_SUBSYS_RST, 1);
@ -950,13 +944,13 @@ int btmtk_usb_subsys_reset(struct hci_dev *hdev, u32 dev_id)
if (err < 0)
return err;
err = btmtk_usb_uhw_reg_read(hdev, MTK_UDMA_INT_STA_BT, &val);
if (err < 0)
if (err)
return err;
err = btmtk_usb_uhw_reg_write(hdev, MTK_UDMA_INT_STA_BT1, 0x000000FF);
if (err < 0)
return err;
err = btmtk_usb_uhw_reg_read(hdev, MTK_UDMA_INT_STA_BT1, &val);
if (err < 0)
if (err)
return err;
/* MT7921 need to delay 20ms between toggle reset bit */
msleep(20);
@ -964,7 +958,7 @@ int btmtk_usb_subsys_reset(struct hci_dev *hdev, u32 dev_id)
if (err < 0)
return err;
err = btmtk_usb_uhw_reg_read(hdev, MTK_BT_SUBSYS_RST, &val);
if (err < 0)
if (err)
return err;
}