linux-kernel - [PATCH] tracing/user_events: Fix memory leak in user_event

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Date:   Tue, 15 Nov 2022 09:44:45 +0800
From:   Xiu Jianfeng <xiujianfeng@...wei.com>
To:     <rostedt@...dmis.org>, <mhiramat@...nel.org>,
        <beaub@...ux.microsoft.com>
CC:     <linux-kernel@...r.kernel.org>
Subject: [PATCH] tracing/user_events: Fix memory leak in user_event_create()

Before current_user_event_group(), it has allocated memory and save it
in @name, this should freed before return error.

Fixes: e5d271812e7a ("tracing/user_events: Move pages/locks into groups to prepare for namespaces")
Signed-off-by: Xiu Jianfeng <xiujianfeng@...wei.com>
---
 kernel/trace/trace_events_user.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace_events_user.c b/kernel/trace/trace_events_user.c
index ae78c2d53c8a..539b08ae7020 100644
--- a/kernel/trace/trace_events_user.c
+++ b/kernel/trace/trace_events_user.c
@@ -1100,8 +1100,10 @@ static int user_event_create(const char *raw_command)
 
 	group = current_user_event_group();
 
-	if (!group)
+	if (!group) {
+		kfree(name);
 		return -ENOENT;
+	}
 
 	mutex_lock(&group->reg_mutex);
 
-- 
2.17.1