esoc: Fix potential NULL pointer dereferences

Update checks to avoid potential NULL pointer dereferences
which are reported in static analysis.

Change-Id: Ibb9db8fb44f9e27da9e531b762dfddd9725c1b4f
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>

4 files changed, 30 insertions, 20 deletions

diff --git a/drivers/esoc/esoc-mdm-4x.c b/drivers/esoc/esoc-mdm-4x.c
index 7275a99873b8..7a5e89636b64 100644
--- a/drivers/esoc/esoc-mdm-4x.c
+++ b/drivers/esoc/esoc-mdm-4x.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2014-2015, 2017, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -434,11 +434,12 @@ static irqreturn_t mdm_status_change(int irq, void *dev_id)
 {
 	int value;
 	struct esoc_clink *esoc;
+	struct device *dev;
 	struct mdm_ctrl *mdm = (struct mdm_ctrl *)dev_id;
-	struct device *dev = mdm->dev;
 
 	if (!mdm)
 		return IRQ_HANDLED;
+	dev = mdm->dev;
 	esoc = mdm->esoc;
 	value = gpio_get_value(MDM_GPIO(mdm, MDM2AP_STATUS));
 	if (value == 0 && mdm->ready) {
@@ -499,7 +500,7 @@ static void mdm_configure_debug(struct mdm_ctrl *mdm)
 	struct device_node *node = mdm->dev->of_node;
 
 	addr = of_iomap(node, 0);
-	if (IS_ERR(addr)) {
+	if (IS_ERR_OR_NULL(addr)) {
 		dev_err(mdm->dev, "failed to get debug base addres\n");
 		return;
 	}
@@ -508,7 +509,7 @@ static void mdm_configure_debug(struct mdm_ctrl *mdm)
 	if (val == MDM_DBG_MODE) {
 		mdm->dbg_mode = true;
 		mdm->cti = coresight_cti_get(MDM_CTI_NAME);
-		if (IS_ERR(mdm->cti)) {
+		if (IS_ERR_OR_NULL(mdm->cti)) {
 			dev_err(mdm->dev, "unable to get cti handle\n");
 			goto cti_get_err;
 		}
@@ -743,7 +744,7 @@ static int mdm9x25_setup_hw(struct mdm_ctrl *mdm,
 	mdm->dev = &pdev->dev;
 	mdm->pon_ops = pon_ops;
 	esoc = devm_kzalloc(mdm->dev, sizeof(*esoc), GFP_KERNEL);
-	if (IS_ERR(esoc)) {
+	if (IS_ERR_OR_NULL(esoc)) {
 		dev_err(mdm->dev, "cannot allocate esoc device\n");
 		return PTR_ERR(esoc);
 	}
@@ -813,7 +814,7 @@ static int mdm9x35_setup_hw(struct mdm_ctrl *mdm,
 	mdm->pon_ops = pon_ops;
 	node = pdev->dev.of_node;
 	esoc = devm_kzalloc(mdm->dev, sizeof(*esoc), GFP_KERNEL);
-	if (IS_ERR(esoc)) {
+	if (IS_ERR_OR_NULL(esoc)) {
 		dev_err(mdm->dev, "cannot allocate esoc device\n");
 		return PTR_ERR(esoc);
 	}
@@ -901,7 +902,7 @@ static int mdm9x55_setup_hw(struct mdm_ctrl *mdm,
 	mdm->pon_ops = pon_ops;
 	node = pdev->dev.of_node;
 	esoc = devm_kzalloc(mdm->dev, sizeof(*esoc), GFP_KERNEL);
-	if (IS_ERR(esoc)) {
+	if (IS_ERR_OR_NULL(esoc)) {
 		dev_err(mdm->dev, "cannot allocate esoc device\n");
 		return PTR_ERR(esoc);
 	}
@@ -1001,11 +1002,11 @@ static int mdm_probe(struct platform_device *pdev)
 	struct mdm_ctrl *mdm;
 
 	match = of_match_node(mdm_dt_match, node);
-	if (IS_ERR(match))
+	if (IS_ERR_OR_NULL(match))
 		return PTR_ERR(match);
 	mdm_ops = match->data;
 	mdm = devm_kzalloc(&pdev->dev, sizeof(*mdm), GFP_KERNEL);
-	if (IS_ERR(mdm))
+	if (IS_ERR_OR_NULL(mdm))
 		return PTR_ERR(mdm);
 	return mdm_ops->config_hw(mdm, mdm_ops, pdev);
 }
diff --git a/drivers/esoc/esoc-mdm-drv.c b/drivers/esoc/esoc-mdm-drv.c
index 9abe125f28b5..8697428eceb2 100644
--- a/drivers/esoc/esoc-mdm-drv.c
+++ b/drivers/esoc/esoc-mdm-drv.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2013-2015, 2017, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -230,7 +230,7 @@ int esoc_ssr_probe(struct esoc_clink *esoc_clink, struct esoc_drv *drv)
 	struct esoc_eng *esoc_eng;
 
 	mdm_drv = devm_kzalloc(&esoc_clink->dev, sizeof(*mdm_drv), GFP_KERNEL);
-	if (IS_ERR(mdm_drv))
+	if (IS_ERR_OR_NULL(mdm_drv))
 		return PTR_ERR(mdm_drv);
 	esoc_eng = &mdm_drv->cmd_eng;
 	esoc_eng->handle_clink_evt = mdm_handle_clink_evt;
diff --git a/drivers/esoc/esoc_bus.c b/drivers/esoc/esoc_bus.c
index 110a5dabed10..c4397f6fd196 100644
--- a/drivers/esoc/esoc_bus.c
+++ b/drivers/esoc/esoc_bus.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2013-2015, 2017, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -129,7 +129,7 @@ struct esoc_clink *get_esoc_clink(int id)
 	struct device *dev;
 
 	dev = bus_find_device(&esoc_bus_type, NULL, &id, esoc_clink_match_id);
-	if (IS_ERR(dev))
+	if (IS_ERR_OR_NULL(dev))
 		return NULL;
 	esoc_clink = to_esoc_clink(dev);
 	return esoc_clink;
@@ -143,7 +143,7 @@ struct esoc_clink *get_esoc_clink_by_node(struct device_node *node)
 
 	dev = bus_find_device(&esoc_bus_type, NULL, node,
 						esoc_clink_match_node);
-	if (IS_ERR(dev))
+	if (IS_ERR_OR_NULL(dev))
 		return NULL;
 	esoc_clink = to_esoc_clink(dev);
 	return esoc_clink;
@@ -175,14 +175,14 @@ int esoc_clink_register_ssr(struct esoc_clink *esoc_clink)
 
 	len = strlen("esoc") + sizeof(esoc_clink->id);
 	subsys_name = kzalloc(len, GFP_KERNEL);
-	if (IS_ERR(subsys_name))
+	if (IS_ERR_OR_NULL(subsys_name))
 		return PTR_ERR(subsys_name);
 	snprintf(subsys_name, len, "esoc%d", esoc_clink->id);
 	esoc_clink->subsys.name = subsys_name;
 	esoc_clink->dev.of_node = esoc_clink->np;
 	esoc_clink->subsys.dev = &esoc_clink->dev;
 	esoc_clink->subsys_dev = subsys_register(&esoc_clink->subsys);
-	if (IS_ERR(esoc_clink->subsys_dev)) {
+	if (IS_ERR_OR_NULL(esoc_clink->subsys_dev)) {
 		dev_err(&esoc_clink->dev, "failed to register ssr node\n");
 		ret = PTR_ERR(esoc_clink->subsys_dev);
 		goto subsys_err;
diff --git a/drivers/esoc/esoc_dev.c b/drivers/esoc/esoc_dev.c
index 56b767b29093..26b8d0fe512b 100644
--- a/drivers/esoc/esoc_dev.c
+++ b/drivers/esoc/esoc_dev.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2013-2014, 2017, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -260,7 +260,16 @@ static int esoc_dev_open(struct inode *inode, struct file *file)
 	unsigned int minor = iminor(inode);
 
 	esoc_udev = esoc_udev_get_by_minor(minor);
+	if (!esoc_udev) {
+		pr_err("failed to get udev\n");
+		return -ENOMEM;
+	}
+
 	esoc_clink = get_esoc_clink(esoc_udev->clink->id);
+	if (!esoc_clink) {
+		pr_err("failed to get clink\n");
+		return -ENOMEM;
+	}
 
 	uhandle = kzalloc(sizeof(*uhandle), GFP_KERNEL);
 	if (!uhandle) {
@@ -306,12 +315,12 @@ int esoc_clink_add_device(struct device *dev, void *dummy)
 	struct esoc_clink *esoc_clink = to_esoc_clink(dev);
 
 	esoc_udev = get_free_esoc_udev(esoc_clink);
-	if (IS_ERR(esoc_udev))
+	if (IS_ERR_OR_NULL(esoc_udev))
 		return PTR_ERR(esoc_udev);
 	esoc_udev->dev = device_create(esoc_class, &esoc_clink->dev,
 					MKDEV(esoc_major, esoc_clink->id),
 					esoc_clink, "esoc-%d", esoc_clink->id);
-	if (IS_ERR(esoc_udev->dev)) {
+	if (IS_ERR_OR_NULL(esoc_udev->dev)) {
 		pr_err("failed to create user device\n");
 		goto dev_err;
 	}
@@ -358,7 +367,7 @@ int __init esoc_dev_init(void)
 {
 	int ret = 0;
 	esoc_class = class_create(THIS_MODULE, "esoc-dev");
-	if (IS_ERR(esoc_class)) {
+	if (IS_ERR_OR_NULL(esoc_class)) {
 		pr_err("coudn't create class");
 		return PTR_ERR(esoc_class);
 	}