[media] dib0700: be sure that dib0700_ctrl_rd() users can do DMA

dib0700_ctrl_rd() takes a RX and a TX pointer. Be sure that
both will point to a memory allocated via kmalloc().

Reviewed-by: Patrick Boettcher <patrick.boettcher@posteo.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

diff --git a/drivers/media/usb/dvb-usb/dib0700_core.c b/drivers/media/usb/dvb-usb/dib0700_core.c
index f319665..515f89d 100644 (file)
--- a/drivers/media/usb/dvb-usb/dib0700_core.c
+++ b/drivers/media/usb/dvb-usb/dib0700_core.c
@@ -292,13 +292,15 @@ static int dib0700_i2c_xfer_legacy(struct i2c_adapter *adap,
 
                        /* special thing in the current firmware: when length is zero the read-failed */
                        len = dib0700_ctrl_rd(d, st->buf, msg[i].len + 2,
-                                       msg[i+1].buf, msg[i+1].len);
+                                             st->buf, msg[i + 1].len);
                        if (len <= 0) {
                                deb_info("I2C read failed on address 0x%02x\n",
                                                msg[i].addr);
                                break;
                        }
 
+                       memcpy(msg[i + 1].buf, st->buf, msg[i + 1].len);
+
                        msg[i+1].len = len;
 
                        i++;

diff --git a/drivers/media/usb/dvb-usb/dib0700_devices.c b/drivers/media/usb/dvb-usb/dib0700_devices.c
index 0857b56..ef1b8ee 100644 (file)
--- a/drivers/media/usb/dvb-usb/dib0700_devices.c
+++ b/drivers/media/usb/dvb-usb/dib0700_devices.c
@@ -508,8 +508,6 @@ static int stk7700ph_tuner_attach(struct dvb_usb_adapter *adap)
 
 #define DEFAULT_RC_INTERVAL 50
 
-static u8 rc_request[] = { REQUEST_POLL_RC, 0 };
-
 /*
  * This function is used only when firmware is < 1.20 version. Newer
  * firmwares use bulk mode, with functions implemented at dib0700_core,
@@ -517,7 +515,6 @@ static u8 rc_request[] = { REQUEST_POLL_RC, 0 };
  */
 static int dib0700_rc_query_old_firmware(struct dvb_usb_device *d)
 {
-       u8 key[4];
        enum rc_type protocol;
        u32 scancode;
        u8 toggle;
@@ -532,39 +529,43 @@ static int dib0700_rc_query_old_firmware(struct dvb_usb_device *d)
                return 0;
        }
 
-       i = dib0700_ctrl_rd(d, rc_request, 2, key, 4);
+       st->buf[0] = REQUEST_POLL_RC;
+       st->buf[1] = 0;
+
+       i = dib0700_ctrl_rd(d, st->buf, 2, st->buf, 4);
        if (i <= 0) {
                err("RC Query Failed");
-               return -1;
+               return -EIO;
        }
 
        /* losing half of KEY_0 events from Philipps rc5 remotes.. */
-       if (key[0] == 0 && key[1] == 0 && key[2] == 0 && key[3] == 0)
+       if (st->buf[0] == 0 && st->buf[1] == 0
+           && st->buf[2] == 0 && st->buf[3] == 0)
                return 0;
 
-       /* info("%d: %2X %2X %2X %2X",dvb_usb_dib0700_ir_proto,(int)key[3-2],(int)key[3-3],(int)key[3-1],(int)key[3]);  */
+       /* info("%d: %2X %2X %2X %2X",dvb_usb_dib0700_ir_proto,(int)st->buf[3 - 2],(int)st->buf[3 - 3],(int)st->buf[3 - 1],(int)st->buf[3]);  */
 
        dib0700_rc_setup(d, NULL); /* reset ir sensor data to prevent false events */
 
        switch (d->props.rc.core.protocol) {
        case RC_BIT_NEC:
                /* NEC protocol sends repeat code as 0 0 0 FF */
-               if ((key[3-2] == 0x00) && (key[3-3] == 0x00) &&
-                   (key[3] == 0xff)) {
+               if ((st->buf[3 - 2] == 0x00) && (st->buf[3 - 3] == 0x00) &&
+                   (st->buf[3] == 0xff)) {
                        rc_repeat(d->rc_dev);
                        return 0;
                }
 
                protocol = RC_TYPE_NEC;
-               scancode = RC_SCANCODE_NEC(key[3-2], key[3-3]);
+               scancode = RC_SCANCODE_NEC(st->buf[3 - 2], st->buf[3 - 3]);
                toggle = 0;
                break;
 
        default:
                /* RC-5 protocol changes toggle bit on new keypress */
                protocol = RC_TYPE_RC5;
-               scancode = RC_SCANCODE_RC5(key[3-2], key[3-3]);
-               toggle = key[3-1];
+               scancode = RC_SCANCODE_RC5(st->buf[3 - 2], st->buf[3 - 3]);
+               toggle = st->buf[3 - 1];
                break;
        }