linux-kernel - [PATCH][tracing-next] tracing: fix uninitialized return value if dyn_event_ops

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Date:   Mon, 10 Dec 2018 23:20:06 +0000
From:   Colin King <colin.king@...onical.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][tracing-next] tracing: fix uninitialized return value if dyn_event_ops_list list is empty

From: Colin Ian King <colin.king@...onical.com>

Currently, in the unlikely case when the dyn_event_ops_list list is
empty then ret is never assigned a value and the function will return
with a uninitialized garbage return value from ret.  Fix this corner
case by setting ret to zero.

Fixes: 5448d44c3855 ("tracing: Add unified dynamic event framework")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 kernel/trace/trace_dynevent.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace_dynevent.c b/kernel/trace/trace_dynevent.c
index dd1f43588d70..4f633476c307 100644
--- a/kernel/trace/trace_dynevent.c
+++ b/kernel/trace/trace_dynevent.c
@@ -74,7 +74,7 @@ int dyn_event_release(int argc, char **argv, struct dyn_event_operations *type)
 static int create_dyn_event(int argc, char **argv)
 {
 	struct dyn_event_operations *ops;
-	int ret;
+	int ret = 0;
 
 	if (argv[0][0] == '-' || argv[0][0] == '!')
 		return dyn_event_release(argc, argv, NULL);
-- 
2.19.1