Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid

Pull HID fixes from Jiri Kosina:

 - DMA-on-stack fixes for a couple drivers, from Benjamin Tissoires

 - small memory sanitization fix for sensor-hub driver, from Song
   Hongyan

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid:
  HID: hid-sensor-hub: clear memory to avoid random data
  HID: rmi: make transfer buffers DMA capable
  HID: magicmouse: make transfer buffers DMA capable
  HID: lg: make transfer buffers DMA capable
  HID: cp2112: make transfer buffers DMA capable

5 files changed, 108 insertions, 44 deletions

diff --git a/drivers/hid/hid-cp2112.c b/drivers/hid/hid-cp2112.c
index 086d8a507157..60d30203a5fa 100644
--- a/drivers/hid/hid-cp2112.c
+++ b/drivers/hid/hid-cp2112.c
@@ -32,6 +32,11 @@
 #include <linux/usb/ch9.h>
 #include "hid-ids.h"
 
+#define CP2112_REPORT_MAX_LENGTH                64
+#define CP2112_GPIO_CONFIG_LENGTH               5
+#define CP2112_GPIO_GET_LENGTH                  2
+#define CP2112_GPIO_SET_LENGTH                  3
+
 enum {
         CP2112_GPIO_CONFIG              = 0x02,
         CP2112_GPIO_GET                 = 0x03,
@@ -161,6 +166,8 @@ struct cp2112_device {
         atomic_t read_avail;
         atomic_t xfer_avail;
         struct gpio_chip gc;
+        u8 *in_out_buffer;
+        spinlock_t lock;
 };
 
 static int gpio_push_pull = 0xFF;
@@ -171,62 +178,86 @@ static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 {
         struct cp2112_device *dev = gpiochip_get_data(chip);
         struct hid_device *hdev = dev->hdev;
-        u8 buf[5];
+        u8 *buf = dev->in_out_buffer;
+        unsigned long flags;
         int ret;
 
+        spin_lock_irqsave(&dev->lock, flags);
+
         ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
-                                       sizeof(buf), HID_FEATURE_REPORT,
-                                       HID_REQ_GET_REPORT);
-        if (ret != sizeof(buf)) {
+                                 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
+                                 HID_REQ_GET_REPORT);
+        if (ret != CP2112_GPIO_CONFIG_LENGTH) {
                 hid_err(hdev, "error requesting GPIO config: %d\n", ret);
-                return ret;
+                goto exit;
         }
 
         buf[1] &= ~(1 << offset);
         buf[2] = gpio_push_pull;
 
-        ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, sizeof(buf),
-                                 HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
+        ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
+                                 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
+                                 HID_REQ_SET_REPORT);
         if (ret < 0) {
                 hid_err(hdev, "error setting GPIO config: %d\n", ret);
-                return ret;
+                goto exit;
         }
 
-        return 0;
+        ret = 0;
+
+exit:
+        spin_unlock_irqrestore(&dev->lock, flags);
+        return ret <= 0 ? ret : -EIO;
 }
 
 static void cp2112_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 {
         struct cp2112_device *dev = gpiochip_get_data(chip);
         struct hid_device *hdev = dev->hdev;
-        u8 buf[3];
+        u8 *buf = dev->in_out_buffer;
+        unsigned long flags;
         int ret;
 
+        spin_lock_irqsave(&dev->lock, flags);
+
         buf[0] = CP2112_GPIO_SET;
         buf[1] = value ? 0xff : 0;
         buf[2] = 1 << offset;
 
-        ret = hid_hw_raw_request(hdev, CP2112_GPIO_SET, buf, sizeof(buf),
-                                 HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
+        ret = hid_hw_raw_request(hdev, CP2112_GPIO_SET, buf,
+                                 CP2112_GPIO_SET_LENGTH, HID_FEATURE_REPORT,
+                                 HID_REQ_SET_REPORT);
         if (ret < 0)
                 hid_err(hdev, "error setting GPIO values: %d\n", ret);
+
+        spin_unlock_irqrestore(&dev->lock, flags);
 }
 
 static int cp2112_gpio_get(struct gpio_chip *chip, unsigned offset)
 {
         struct cp2112_device *dev = gpiochip_get_data(chip);
         struct hid_device *hdev = dev->hdev;
-        u8 buf[2];
+        u8 *buf = dev->in_out_buffer;
+        unsigned long flags;
         int ret;
 
-        ret = hid_hw_raw_request(hdev, CP2112_GPIO_GET, buf, sizeof(buf),
-                                       HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
-        if (ret != sizeof(buf)) {
+        spin_lock_irqsave(&dev->lock, flags);
+
+        ret = hid_hw_raw_request(hdev, CP2112_GPIO_GET, buf,
+                                 CP2112_GPIO_GET_LENGTH, HID_FEATURE_REPORT,
+                                 HID_REQ_GET_REPORT);
+        if (ret != CP2112_GPIO_GET_LENGTH) {
                 hid_err(hdev, "error requesting GPIO values: %d\n", ret);
-                return ret;
+                ret = ret < 0 ? ret : -EIO;
+                goto exit;
         }
 
-        return (buf[1] >> offset) & 1;
+        ret = (buf[1] >> offset) & 1;
+
+exit:
+        spin_unlock_irqrestore(&dev->lock, flags);
+
+        return ret;
 }
 
 static int cp2112_gpio_direction_output(struct gpio_chip *chip,
@@ -234,27 +265,33 @@ static int cp2112_gpio_direction_output(struct gpio_chip *chip,
 {
         struct cp2112_device *dev = gpiochip_get_data(chip);
         struct hid_device *hdev = dev->hdev;
-        u8 buf[5];
+        u8 *buf = dev->in_out_buffer;
+        unsigned long flags;
         int ret;
 
+        spin_lock_irqsave(&dev->lock, flags);
+
         ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
-                                       sizeof(buf), HID_FEATURE_REPORT,
-                                       HID_REQ_GET_REPORT);
-        if (ret != sizeof(buf)) {
+                                 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
+                                 HID_REQ_GET_REPORT);
+        if (ret != CP2112_GPIO_CONFIG_LENGTH) {
                 hid_err(hdev, "error requesting GPIO config: %d\n", ret);
-                return ret;
+                goto fail;
         }
 
         buf[1] |= 1 << offset;
         buf[2] = gpio_push_pull;
 
-        ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, sizeof(buf),
-                                 HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
+        ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
+                                 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
+                                 HID_REQ_SET_REPORT);
         if (ret < 0) {
                 hid_err(hdev, "error setting GPIO config: %d\n", ret);
-                return ret;
+                goto fail;
         }
 
+        spin_unlock_irqrestore(&dev->lock, flags);
+
         /*
          * Set gpio value when output direction is already set,
          * as specified in AN495, Rev. 0.2, cpt. 4.4
@@ -262,6 +299,10 @@ static int cp2112_gpio_direction_output(struct gpio_chip *chip,
         cp2112_gpio_set(chip, offset, value);
 
         return 0;
+
+fail:
+        spin_unlock_irqrestore(&dev->lock, flags);
+        return ret < 0 ? ret : -EIO;
 }
 
 static int cp2112_hid_get(struct hid_device *hdev, unsigned char report_number,
@@ -1007,6 +1048,17 @@ static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id)
         struct cp2112_smbus_config_report config;
         int ret;
 
+        dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL);
+        if (!dev)
+                return -ENOMEM;
+
+        dev->in_out_buffer = devm_kzalloc(&hdev->dev, CP2112_REPORT_MAX_LENGTH,
+                                          GFP_KERNEL);
+        if (!dev->in_out_buffer)
+                return -ENOMEM;
+
+        spin_lock_init(&dev->lock);
+
         ret = hid_parse(hdev);
         if (ret) {
                 hid_err(hdev, "parse failed\n");
@@ -1063,12 +1115,6 @@ static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id)
                 goto err_power_normal;
         }
 
-        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
-        if (!dev) {
-                ret = -ENOMEM;
-                goto err_power_normal;
-        }
-
         hid_set_drvdata(hdev, (void *)dev);
         dev->hdev               = hdev;
         dev->adap.owner         = THIS_MODULE;
@@ -1087,7 +1133,7 @@ static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id)
 
         if (ret) {
                 hid_err(hdev, "error registering i2c adapter\n");
-                goto err_free_dev;
+                goto err_power_normal;
         }
 
         hid_dbg(hdev, "adapter registered\n");
@@ -1123,8 +1169,6 @@ err_gpiochip_remove:
         gpiochip_remove(&dev->gc);
 err_free_i2c:
         i2c_del_adapter(&dev->adap);
-err_free_dev:
-        kfree(dev);
 err_power_normal:
         hid_hw_power(hdev, PM_HINT_NORMAL);
 err_hid_close:
@@ -1149,7 +1193,6 @@ static void cp2112_remove(struct hid_device *hdev)
          */
         hid_hw_close(hdev);
         hid_hw_stop(hdev);
-        kfree(dev);
 }
 
 static int cp2112_raw_event(struct hid_device *hdev, struct hid_report *report,
diff --git a/drivers/hid/hid-lg.c b/drivers/hid/hid-lg.c
index 76f644deb0a7..c5c5fbe9d605 100644
--- a/drivers/hid/hid-lg.c
+++ b/drivers/hid/hid-lg.c
@@ -756,11 +756,16 @@ static int lg_probe(struct hid_device *hdev, const struct hid_device_id *id)
 
         /* Setup wireless link with Logitech Wii wheel */
         if (hdev->product == USB_DEVICE_ID_LOGITECH_WII_WHEEL) {
-                unsigned char buf[] = { 0x00, 0xAF,  0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+                const unsigned char cbuf[] = { 0x00, 0xAF,  0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+                u8 *buf = kmemdup(cbuf, sizeof(cbuf), GFP_KERNEL);
 
-                ret = hid_hw_raw_request(hdev, buf[0], buf, sizeof(buf),
-                                        HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
+                if (!buf) {
+                        ret = -ENOMEM;
+                        goto err_free;
+                }
 
+                ret = hid_hw_raw_request(hdev, buf[0], buf, sizeof(cbuf),
+                                        HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
                 if (ret >= 0) {
                         /* insert a little delay of 10 jiffies ~ 40ms */
                         wait_queue_head_t wait;
@@ -772,9 +777,10 @@ static int lg_probe(struct hid_device *hdev, const struct hid_device_id *id)
                         buf[1] = 0xB2;
                         get_random_bytes(&buf[2], 2);
 
-                        ret = hid_hw_raw_request(hdev, buf[0], buf, sizeof(buf),
+                        ret = hid_hw_raw_request(hdev, buf[0], buf, sizeof(cbuf),
                                         HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
                 }
+                kfree(buf);
         }
 
         if (drv_data->quirks & LG_FF)
diff --git a/drivers/hid/hid-magicmouse.c b/drivers/hid/hid-magicmouse.c
index d6fa496d0ca2..20b40ad26325 100644
--- a/drivers/hid/hid-magicmouse.c
+++ b/drivers/hid/hid-magicmouse.c
@@ -493,7 +493,8 @@ static int magicmouse_input_configured(struct hid_device *hdev,
 static int magicmouse_probe(struct hid_device *hdev,
         const struct hid_device_id *id)
 {
-        __u8 feature[] = { 0xd7, 0x01 };
+        const u8 feature[] = { 0xd7, 0x01 };
+        u8 *buf;
         struct magicmouse_sc *msc;
         struct hid_report *report;
         int ret;
@@ -544,6 +545,12 @@ static int magicmouse_probe(struct hid_device *hdev,
         }
         report->size = 6;
 
+        buf = kmemdup(feature, sizeof(feature), GFP_KERNEL);
+        if (!buf) {
+                ret = -ENOMEM;
+                goto err_stop_hw;
+        }
+
         /*
          * Some devices repond with 'invalid report id' when feature
          * report switching it into multitouch mode is sent to it.
@@ -552,8 +559,9 @@ static int magicmouse_probe(struct hid_device *hdev,
          * but there seems to be no other way of switching the mode.
          * Thus the super-ugly hacky success check below.
          */
-        ret = hid_hw_raw_request(hdev, feature[0], feature, sizeof(feature),
+        ret = hid_hw_raw_request(hdev, buf[0], buf, sizeof(feature),
                                 HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
+        kfree(buf);
         if (ret != -EIO && ret != sizeof(feature)) {
                 hid_err(hdev, "unable to request touch data (%d)\n", ret);
                 goto err_stop_hw;
diff --git a/drivers/hid/hid-rmi.c b/drivers/hid/hid-rmi.c
index 9cd2ca34a6be..be89bcbf6a71 100644
--- a/drivers/hid/hid-rmi.c
+++ b/drivers/hid/hid-rmi.c
@@ -188,10 +188,16 @@ static int rmi_set_page(struct hid_device *hdev, u8 page)
 static int rmi_set_mode(struct hid_device *hdev, u8 mode)
 {
         int ret;
-        u8 txbuf[2] = {RMI_SET_RMI_MODE_REPORT_ID, mode};
+        const u8 txbuf[2] = {RMI_SET_RMI_MODE_REPORT_ID, mode};
+        u8 *buf;
 
-        ret = hid_hw_raw_request(hdev, RMI_SET_RMI_MODE_REPORT_ID, txbuf,
+        buf = kmemdup(txbuf, sizeof(txbuf), GFP_KERNEL);
+        if (!buf)
+                return -ENOMEM;
+
+        ret = hid_hw_raw_request(hdev, RMI_SET_RMI_MODE_REPORT_ID, buf,
                         sizeof(txbuf), HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
+        kfree(buf);
         if (ret < 0) {
                 dev_err(&hdev->dev, "unable to set rmi mode to %d (%d)\n", mode,
                         ret);
diff --git a/drivers/hid/hid-sensor-hub.c b/drivers/hid/hid-sensor-hub.c
index c5c3d6111729..60875625cbdf 100644
--- a/drivers/hid/hid-sensor-hub.c
+++ b/drivers/hid/hid-sensor-hub.c
@@ -212,6 +212,7 @@ int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
         __s32 value;
         int ret = 0;
 
+        memset(buffer, 0, buffer_size);
         mutex_lock(&data->mutex);
         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
         if (!report || (field_index >= report->maxfield)) {