4.16-stable review patch. If anyone has any objections, please let me know.
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From: Geert Uytterhoeven geert+renesas@glider.be
[ Upstream commit 090fa4b0dccfa3d04e1c5ab0fe4eba16e6713895 ]
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 geert+renesas@glider.be Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/serial/sh-sci.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -3098,6 +3098,10 @@ static struct plat_sci_port *sci_parse_d 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;