pinctrl: freescale: Fix a memory out of bounds when num_configs is 1

The config passed in by pad wakeup is 1, when num_configs is 1,
Configuration [1] should not be fetched, which will be detected
by KASAN as a memory out of bounds condition. Modify to get
configs[1] when num_configs is 2.

Fixes: f60c9ea ("gpio: mxc: enable pad wakeup on i.MX8x platforms")
Signed-off-by: Xiaolei Wang <[email protected]>
Reviewed-by: Peng Fan <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>

Author: xiaoleiwang123456

drivers/pinctrl/freescale/pinctrl-scu.c

@@ -90,7 +90,7 @@ int imx_pinconf_set_scu(struct pinctrl_dev *pctldev, unsigned pin_id,
 	struct imx_sc_msg_req_pad_set msg;
 	struct imx_sc_rpc_msg *hdr = &msg.hdr;
 	unsigned int mux = configs[0];
-	unsigned int conf = configs[1];
+	unsigned int conf;
 	unsigned int val;
 	int ret;
 
@@ -115,6 +115,7 @@ int imx_pinconf_set_scu(struct pinctrl_dev *pctldev, unsigned pin_id,
 	 * Set mux and conf together in one IPC call
 	 */
 	WARN_ON(num_configs != 2);
+	conf = configs[1];
 
 	val = conf | BM_PAD_CTL_IFMUX_ENABLE | BM_PAD_CTL_GP_ENABLE;
 	val |= mux << BP_PAD_CTL_IFMUX;