linux-kernel - [PATCH 1/2] tracing: Return -EINVAL if WARN_ON(!glob) triggered in event_hist_trigger

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Message-Id: <20220417185323.198034-2-ammarfaizi2@gnuweeb.org>
Date:   Mon, 18 Apr 2022 01:53:22 +0700
From:   Ammar Faizi <ammarfaizi2@...weeb.org>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     Ammar Faizi <ammarfaizi2@...weeb.org>,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Trace Devel Mailing List 
        <llinux-trace-devel@...r.kernel.org>
Subject: [PATCH 1/2] tracing: Return -EINVAL if WARN_ON(!glob) triggered in event_hist_trigger_parse()

If `WARN_ON(!glob)` is ever triggered, we will still continue executing
the next lines. This will trigger the more serious problem, a NULL
pointer dereference bug.

Just return -EINVAL if @glob is NULL.

Signed-off-by: Ammar Faizi <ammarfaizi2@...weeb.org>
---
 kernel/trace/trace_events_hist.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 44db5ba9cabb..0b99ad68e3fa 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -6186,7 +6186,8 @@ static int event_hist_trigger_parse(struct event_command *cmd_ops,
 
 	lockdep_assert_held(&event_mutex);
 
-	WARN_ON(!glob);
+	if (WARN_ON(!glob))
+		return -EINVAL;
 
 	if (strlen(glob)) {
 		hist_err_clear();
-- 
Ammar Faizi