1 files changed, 8 insertions, 7 deletions

diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index 20508f053658..96c333a5b0fc 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -734,26 +734,27 @@ perf_counter_alloc(u32 hw_event_period, int cpu, u32 record_type)
  * @pid:                target pid
  */
 asmlinkage int
-sys_perf_counter_open(u32 hw_event_type,
-                      u32 hw_event_period,
-                      u32 record_type,
-                      pid_t pid,
-                      int cpu)
+sys_perf_counter_open(struct perf_counter_event __user *uevent, u32 record_type,
+                      pid_t pid, int cpu, int masterfd)
 {
         struct perf_counter_context *ctx;
+        struct perf_counter_event event;
         struct perf_counter *counter;
         int ret;
 
+        if (copy_from_user(&event, uevent, sizeof(event)) != 0)
+                return -EFAULT;
+
         ctx = find_get_context(pid, cpu);
         if (IS_ERR(ctx))
                 return PTR_ERR(ctx);
 
         ret = -ENOMEM;
-        counter = perf_counter_alloc(hw_event_period, cpu, record_type);
+        counter = perf_counter_alloc(event.hw_event_period, cpu, record_type);
         if (!counter)
                 goto err_put_context;
 
-        ret = hw_perf_counter_init(counter, hw_event_type);
+        ret = hw_perf_counter_init(counter, event.hw_event_type);
         if (ret)
                 goto err_free_put_context;