linux-kernel - [PATCH 4.14 150/165] serial: xuartps: Fix out-of-bounds access through DT alias

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20180524093628.149787831@linuxfoundation.org>
Date:   Thu, 24 May 2018 11:39:16 +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,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Michal Simek <michal.simek@...inx.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 150/165] serial: xuartps: Fix out-of-bounds access through DT alias

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Geert Uytterhoeven <geert+renesas@...der.be>

[ Upstream commit e7d75e18d0fc3f7193b65282b651f980c778d935 ]

The cdns_uart_port[] array is indexed using a value derived from the
"serialN" alias in DT, which may lead to an out-of-bounds access.

Fix this by adding a range check.

Fixes: 928e9263492069ee ("tty: xuartps: Initialize ports according to aliases")
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
Reviewed-by: Michal Simek <michal.simek@...inx.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/tty/serial/xilinx_uartps.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -1115,7 +1115,7 @@ static struct uart_port *cdns_uart_get_p
 	struct uart_port *port;
 
 	/* Try the given port id if failed use default method */
-	if (cdns_uart_port[id].mapbase != 0) {
+	if (id < CDNS_UART_NR_PORTS && cdns_uart_port[id].mapbase != 0) {
 		/* Find the next unused port */
 		for (id = 0; id < CDNS_UART_NR_PORTS; id++)
 			if (cdns_uart_port[id].mapbase == 0)