linux-kernel - [PATCH 5.10 072/188] thunderbolt: Fix off by one in tb_port_find

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Message-Id: <20210412084016.048474042@linuxfoundation.org>
Date:   Mon, 12 Apr 2021 10:39:46 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: [PATCH 5.10 072/188] thunderbolt: Fix off by one in tb_port_find_retimer()

From: Dan Carpenter <dan.carpenter@...cle.com>

commit 08fe7ae1857080f5075df5ac7fef2ecd4e289117 upstream.

This array uses 1-based indexing so it corrupts memory one element
beyond of the array.  Fix it by making the array one element larger.

Fixes: dacb12877d92 ("thunderbolt: Add support for on-board retimers")
Cc: stable@...r.kernel.org
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/thunderbolt/retimer.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/thunderbolt/retimer.c
+++ b/drivers/thunderbolt/retimer.c
@@ -406,7 +406,7 @@ static struct tb_retimer *tb_port_find_r
  */
 int tb_retimer_scan(struct tb_port *port)
 {
-	u32 status[TB_MAX_RETIMER_INDEX] = {};
+	u32 status[TB_MAX_RETIMER_INDEX + 1] = {};
 	int ret, i, last_idx = 0;
 
 	if (!port->cap_usb4)