From mboxrd@z Thu Jan 1 00:00:00 1970 From: geert+renesas@glider.be (Geert Uytterhoeven) Date: Fri, 23 Feb 2018 14:38:35 +0100 Subject: [PATCH v2 7/9] serial: sh-sci: Fix out-of-bounds access through DT alias In-Reply-To: <1519393117-31998-1-git-send-email-geert+renesas@glider.be> References: <1519393117-31998-1-git-send-email-geert+renesas@glider.be> List-ID: Message-ID: <1519393117-31998-8-git-send-email-geert+renesas@glider.be> To: linux-snps-arc@lists.infradead.org The sci_ports[] 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. Note that the array size is defined by a Kconfig symbol (CONFIG_SERIAL_SH_SCI_NR_UARTS), so this can even be triggered using a legitimate DTB. Fixes: 97ed9790c514066b ("serial: sh-sci: Remove unused platform data capabilities field") Signed-off-by: Geert Uytterhoeven --- v2: - Fix Fixes reference, - Use ARRAY_SIZE(). --- drivers/tty/serial/sh-sci.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 4d14f321cbec95e0..f6a6610d434efc33 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -3096,6 +3096,10 @@ static struct plat_sci_port *sci_parse_dt(struct platform_device *pdev, dev_err(&pdev->dev, "failed to get alias id (%d)\n", id); return NULL; } + if (id >= ARRAY_SIZE(sci_ports)) { + dev_err(&pdev->dev, "serial%d out of range\n", id); + return NULL; + } sp = &sci_ports[id]; *dev_id = id; -- 2.7.4