[S390] cio: Use strict_strtoul() for attributes.

Make parsing of attribute writes handle incorrect input better.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

5 files changed, 35 insertions, 18 deletions

diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c
index fe1ad1722158..85b2e51a42ae 100644
--- a/drivers/s390/cio/ccwgroup.c
+++ b/drivers/s390/cio/ccwgroup.c
@@ -318,7 +318,7 @@ ccwgroup_online_store (struct device *dev, struct device_attribute *attr, const
 {
         struct ccwgroup_device *gdev;
         struct ccwgroup_driver *gdrv;
-        unsigned int value;
+        unsigned long value;
         int ret;
 
         gdev = to_ccwgroupdev(dev);
@@ -329,7 +329,9 @@ ccwgroup_online_store (struct device *dev, struct device_attribute *attr, const
         if (!try_module_get(gdrv->owner))
                 return -EINVAL;
 
-        value = simple_strtoul(buf, NULL, 0);
+        ret = strict_strtoul(buf, 0, &value);
+        if (ret)
+                goto out;
         ret = count;
         if (value == 1)
                 ccwgroup_set_online(gdev);
@@ -337,6 +339,7 @@ ccwgroup_online_store (struct device *dev, struct device_attribute *attr, const
                 ccwgroup_set_offline(gdev);
         else
                 ret = -EINVAL;
+out:
         module_put(gdrv->owner);
         return ret;
 }
diff --git a/drivers/s390/cio/cmf.c b/drivers/s390/cio/cmf.c
index f4c132ab39ed..2808b6833b9e 100644
--- a/drivers/s390/cio/cmf.c
+++ b/drivers/s390/cio/cmf.c
@@ -1219,16 +1219,21 @@ static ssize_t cmb_enable_store(struct device *dev,
 {
         struct ccw_device *cdev;
         int ret;
+        unsigned long val;
+
+        ret = strict_strtoul(buf, 16, &val);
+        if (ret)
+                return ret;
 
         cdev = to_ccwdev(dev);
 
-        switch (buf[0]) {
-        case '0':
+        switch (val) {
+        case 0:
                 ret = disable_cmf(cdev);
                 if (ret)
                         dev_info(&cdev->dev, "disable_cmf failed (%d)\n", ret);
                 break;
-        case '1':
+        case 1:
                 ret = enable_cmf(cdev);
                 if (ret && ret != -EBUSY)
                         dev_info(&cdev->dev, "enable_cmf failed (%d)\n", ret);
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index c1afab5f72d6..595e327d2f76 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -705,13 +705,17 @@ css_cm_enable_store(struct device *dev, struct device_attribute *attr,
 {
         struct channel_subsystem *css = to_css(dev);
         int ret;
+        unsigned long val;
 
+        ret = strict_strtoul(buf, 16, &val);
+        if (ret)
+                return ret;
         mutex_lock(&css->mutex);
-        switch (buf[0]) {
-        case '0':
+        switch (val) {
+        case 0:
                 ret = css->cm_enabled ? chsc_secm(css, 0) : 0;
                 break;
-        case '1':
+        case 1:
                 ret = css->cm_enabled ? 0 : chsc_secm(css, 1);
                 break;
         default:
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index e0c7adb8958e..abfd601d237a 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -512,8 +512,8 @@ static ssize_t online_store (struct device *dev, struct device_attribute *attr,
                              const char *buf, size_t count)
 {
         struct ccw_device *cdev = to_ccwdev(dev);
-        int i, force;
-        char *tmp;
+        int force, ret;
+        unsigned long i;
 
         if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0)
                 return -EAGAIN;
@@ -525,25 +525,30 @@ static ssize_t online_store (struct device *dev, struct device_attribute *attr,
         if (!strncmp(buf, "force\n", count)) {
                 force = 1;
                 i = 1;
+                ret = 0;
         } else {
                 force = 0;
-                i = simple_strtoul(buf, &tmp, 16);
+                ret = strict_strtoul(buf, 16, &i);
         }
-
+        if (ret)
+                goto out;
         switch (i) {
         case 0:
                 online_store_handle_offline(cdev);
+                ret = count;
                 break;
         case 1:
                 online_store_handle_online(cdev, force);
+                ret = count;
                 break;
         default:
-                count = -EINVAL;
+                ret = -EINVAL;
         }
+out:
         if (cdev->drv)
                 module_put(cdev->drv->owner);
         atomic_set(&cdev->private->onoff, 0);
-        return count;
+        return ret;
 }
 
 static ssize_t
diff --git a/drivers/s390/cio/qdio.c b/drivers/s390/cio/qdio.c
index 43876e287370..445cf364e461 100644
--- a/drivers/s390/cio/qdio.c
+++ b/drivers/s390/cio/qdio.c
@@ -3663,11 +3663,11 @@ qdio_performance_stats_show(struct bus_type *bus, char *buf)
 static ssize_t
 qdio_performance_stats_store(struct bus_type *bus, const char *buf, size_t count)
 {
-        char *tmp;
-        int i;
+        unsigned long i;
+        int ret;
 
-        i = simple_strtoul(buf, &tmp, 16);
-        if ((i == 0) || (i == 1)) {
+        ret = strict_strtoul(buf, 16, &i);
+        if (!ret && ((i == 0) || (i == 1))) {
                 if (i == qdio_performance_stats)
                         return count;
                 qdio_performance_stats = i;