tracing: cleanup for tracing_trace_options_read()

'\n' is already appended, and what we need is just an extra
space for the '\0'.

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
LKML-Reference: <4A3EED63.3090908@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index e30e6b1dbd4e..38a4a3ee749d 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2256,8 +2256,8 @@ tracing_trace_options_read(struct file *filp, char __user *ubuf,
                 len += 3; /* "no" and newline */
         }
 
-        /* +2 for \n and \0 */
-        buf = kmalloc(len + 2, GFP_KERNEL);
+        /* +1 for \0 */
+        buf = kmalloc(len + 1, GFP_KERNEL);
         if (!buf) {
                 mutex_unlock(&trace_types_lock);
                 return -ENOMEM;
@@ -2280,7 +2280,7 @@ tracing_trace_options_read(struct file *filp, char __user *ubuf,
         }
         mutex_unlock(&trace_types_lock);
 
-        WARN_ON(r >= len + 2);
+        WARN_ON(r >= len + 1);
 
         r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);