[PATCH] HID: hidraw: switch to using memdup_user

[Dmitry Torokhov]

Instead of open-coding memory allocation and copying form user memory
sequence let's use memdup_user().

Signed-off-by: Dmitry Torokhov <dmitry.torok...@gmail.com>
---
 drivers/hid/hidraw.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c
index 9c2d7c2..b9a76e3 100644
--- a/drivers/hid/hidraw.c
+++ b/drivers/hid/hidraw.c
@@ -34,6 +34,7 @@
 #include <linux/hid.h>
 #include <linux/mutex.h>
 #include <linux/sched.h>
+#include <linux/string.h>
 
 #include <linux/hidraw.h>
 
@@ -123,7 +124,6 @@ static ssize_t hidraw_send_report(struct file *file, const 
char __user *buffer,
 
        dev = hidraw_table[minor]->hid;
 
-
        if (count > HID_MAX_BUFFER_SIZE) {
                hid_warn(dev, "pid %d passed too large report\n",
                         task_pid_nr(current));
@@ -138,17 +138,12 @@ static ssize_t hidraw_send_report(struct file *file, 
const char __user *buffer,
                goto out;
        }
 
-       buf = kmalloc(count * sizeof(__u8), GFP_KERNEL);
-       if (!buf) {
-               ret = -ENOMEM;
+       buf = memdup_user(buffer, count);
+       if (IS_ERR(buf)) {
+               ret = PTR_ERR(buf);
                goto out;
        }
 
-       if (copy_from_user(buf, buffer, count)) {
-               ret = -EFAULT;
-               goto out_free;
-       }
-
        if ((report_type == HID_OUTPUT_REPORT) &&
            !(dev->quirks & HID_QUIRK_NO_OUTPUT_REPORTS_ON_INTR_EP)) {
                ret = hid_hw_output_report(dev, buf, count);
-- 
2.7.0.rc3.207.g0ac5344


-- 
Dmitry