ftrace: iter ctrl fix

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 3ae17e254fc3..688b4cf72d99 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1920,6 +1920,11 @@ tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf,
                         break;
                 }
         }
+        /*
+         * If no option could be set, return an error:
+         */
+        if (!trace_options[i])
+                return -EINVAL;
 
         filp->f_pos += cnt;