linux-kernel - [PATCH] printk: Check valid console index for preferred console

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Message-ID: <20231004085434.42570-1-tony@atomide.com>
Date:   Wed,  4 Oct 2023 11:54:33 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Ogness <john.ogness@...utronix.de>,
        Sergey Senozhatsky <senozhatsky@...omium.org>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] printk: Check valid console index for preferred console

Let's check for valid console index values.

Signed-off-by: Tony Lindgren <tony@...mide.com>
---
 kernel/printk/printk.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2410,6 +2410,10 @@ static int __add_preferred_console(char *name, int idx, char *options,
 	struct console_cmdline *c;
 	int i;
 
+	/* See struct console */
+	if (idx > SHRT_MAX)
+		return -EINVAL;
+
 	/*
 	 *	See if this tty is not yet registered, and
 	 *	if we have a slot free.
-- 
2.42.0