From: Ingo Molnar <mingo@elte.hu>
Date: Mon, 12 May 2008 19:20:53 +0000 (+0200)
Subject: ftrace: iter ctrl fix
X-Git-Tag: firefly_0821_release~19697^2^2~1^2~82
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=442e544ce52d4415a024920b84fb95c5f9aa0855;p=firefly-linux-kernel-4.4.55.git

ftrace: iter ctrl fix

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

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;