[PATCH v2 9/9] serial: xuartps: Fix out-of-bounds access through DT alias
STALE3146d
REVIEWED: 1 (0M)
From: geert+renesas@glider.be (Geert Uytterhoeven)
Date: 2018-02-23 13:38:37
Also in:
linux-devicetree, linux-renesas-soc, linux-serial, lkml
Subsystem:
the rest, tty layer and serial drivers · Maintainers:
Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
Revision v2 of 2 in this series; 1 review trailer.
Revisions (2)
- v1 [diff vs current]
- v2 current
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@glider.be>
---
v2:
- Fix Fixes reference.
---
drivers/tty/serial/xilinx_uartps.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index b9b2bc76bcac606c..abcb4d09a2d866d0 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c@@ -1110,7 +1110,7 @@ static struct uart_port *cdns_uart_get_port(int id) 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)
--
2.7.4