1 files changed, 3 insertions, 4 deletions

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 155b5d5a4e45..f2f5064701e5 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -228,10 +228,9 @@ ftrace_event_write(struct file *file, const char __user *ubuf,
                    size_t cnt, loff_t *ppos)
 {
         struct trace_parser parser;
-        size_t read = 0;
-        ssize_t ret;
+        ssize_t read, ret;
 
-        if (!cnt || cnt < 0)
+        if (!cnt)
                 return 0;
 
         ret = tracing_update_buffers();
@@ -243,7 +242,7 @@ ftrace_event_write(struct file *file, const char __user *ubuf,
 
         read = trace_get_user(&parser, ubuf, cnt, ppos);
 
-        if (trace_parser_loaded((&parser))) {
+        if (read >= 0 && trace_parser_loaded((&parser))) {
                 int set = 1;
 
                 if (*parser.buffer == '!')