HID: hidraw: switch to using memdup_user
Instead of open-coding memory allocation and copying form user memory
sequence let's use memdup_user().
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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 @@
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 @@
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);
