ieee802154: atusb: do not use the stack for address fetching to make it DMA able

From 4.9 we should really avoid using the stack here as this will not be DMA
able on various platforms. This changes a buffer that was introduced in the
4.10 merge window.

Fixes: 6cc33eba232c ("ieee802154: atusb: try to read permanent extended
address from device")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Stefan Schmidt <stefan@osg.samsung.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/drivers/net/ieee802154/atusb.c b/drivers/net/ieee802154/atusb.c
index 67790f88908dabbd19c215002cd35ec58f5de10a..63cb67917a0716075e846106a005f2d1c919b26e 100644 (file)
--- a/drivers/net/ieee802154/atusb.c
+++ b/drivers/net/ieee802154/atusb.c
@@ -721,7 +721,7 @@ fail:
 static int atusb_set_extended_addr(struct atusb *atusb)
 {
        struct usb_device *usb_dev = atusb->usb_dev;
-       unsigned char buffer[IEEE802154_EXTENDED_ADDR_LEN];
+       unsigned char *buffer;
        __le64 extended_addr;
        u64 addr;
        int ret;
@@ -733,6 +733,10 @@ static int atusb_set_extended_addr(struct atusb *atusb)
                return 0;
        }
 
+       buffer = kmalloc(IEEE802154_EXTENDED_ADDR_LEN, GFP_KERNEL);
+       if (!buffer)
+               return -ENOMEM;
+
        /* Firmware is new enough so we fetch the address from EEPROM */
        ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
                                ATUSB_EUI64_READ, ATUSB_REQ_FROM_DEV, 0, 0,
@@ -740,6 +744,7 @@ static int atusb_set_extended_addr(struct atusb *atusb)
        if (ret < 0) {
                dev_err(&usb_dev->dev, "failed to fetch extended address, random address set\n");
                ieee802154_random_extended_addr(&atusb->hw->phy->perm_extended_addr);
+               kfree(buffer);
                return ret;
        }
 
@@ -755,6 +760,7 @@ static int atusb_set_extended_addr(struct atusb *atusb)
                        &addr);
        }
 
+       kfree(buffer);
        return ret;
 }