cxusb: treat firmware data as const

...which means allocating our own copy when we want to modify it.

(stupid thinko fixed by mkrufky)

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>

1 files changed, 18 insertions, 3 deletions

diff --git a/drivers/media/dvb/dvb-usb/cxusb.c b/drivers/media/dvb/dvb-usb/cxusb.c
index 720fcd1c3c1d..0286156704f2 100644
--- a/drivers/media/dvb/dvb-usb/cxusb.c
+++ b/drivers/media/dvb/dvb-usb/cxusb.c
@@ -24,6 +24,7 @@
  * see Documentation/dvb/README.dvb-usb for more information
  */
 #include <media/tuner.h>
+#include <linux/vmalloc.h>
 
 #include "cxusb.h"
 
@@ -700,12 +701,26 @@ static int bluebird_patch_dvico_firmware_download(struct usb_device *udev,
 
                 if (fw->data[idoff] == (USB_VID_DVICO & 0xff) &&
                     fw->data[idoff + 1] == USB_VID_DVICO >> 8) {
-                        fw->data[idoff + 2] =
+                        struct firmware new_fw;
+                        u8 *new_fw_data = vmalloc(fw->size);
+                        int ret;
+
+                        if (!new_fw_data)
+                                return -ENOMEM;
+
+                        memcpy(new_fw_data, fw->data, fw->size);
+                        new_fw.size = fw->size;
+                        new_fw.data = new_fw_data;
+
+                        new_fw_data[idoff + 2] =
                                 le16_to_cpu(udev->descriptor.idProduct) + 1;
-                        fw->data[idoff + 3] =
+                        new_fw_data[idoff + 3] =
                                 le16_to_cpu(udev->descriptor.idProduct) >> 8;
 
-                        return usb_cypress_load_firmware(udev, fw, CYPRESS_FX2);
+                        ret = usb_cypress_load_firmware(udev, &new_fw,
+                                                        CYPRESS_FX2);
+                        vfree(new_fw_data);
+                        return ret;
                 }
         }