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authorGeert Uytterhoeven <geert+renesas@glider.be>2018-02-23 14:38:37 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-05-30 07:47:43 +0200
commit8984c7441dc8f1c3ea0ea182a861f8e7f4d704e8 (patch)
treebba1cba5564d88d51769502cb2c03b16afc76d04
parent75d852e568ed75f214d80ff0abc3e80cdb118625 (diff)
serial: xuartps: Fix out-of-bounds access through DT alias
[ 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@glider.be> Reviewed-by: Michal Simek <michal.simek@xilinx.com> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/tty/serial/xilinx_uartps.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index fabde0e878e0..df28ef14382b 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -1001,7 +1001,7 @@ 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)