linux-kernel - [for-linus][PATCH 3/4] tracing/kprobe: Fix uninitialized variable bug

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Message-Id: <20200210144535.457004128@goodmis.org>
Date:   Mon, 10 Feb 2020 09:44:58 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Tom Zanussi <zanussi@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: [for-linus][PATCH 3/4] tracing/kprobe: Fix uninitialized variable bug

From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>

There is a potential execution path in which variable *ret* is returned
without being properly initialized, previously.

Fix this by initializing variable *ret* to 0.

Link: http://lkml.kernel.org/r/20200205223404.GA3379@embeddedor

Addresses-Coverity-ID: 1491142 ("Uninitialized scalar variable")
Fixes: 2a588dd1d5d6 ("tracing: Add kprobe event command generation functions")
Reviewed-by: Tom Zanussi <zanussi@...nel.org>
Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
 kernel/trace/trace_kprobe.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 51efc790aea8..21bafd48f2ac 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1012,7 +1012,7 @@ int __kprobe_event_add_fields(struct dynevent_cmd *cmd, ...)
 {
 	struct dynevent_arg arg;
 	va_list args;
-	int ret;
+	int ret = 0;
 
 	if (cmd->type != DYNEVENT_TYPE_KPROBE)
 		return -EINVAL;
-- 
2.24.1