HID: roccat: potential out of bounds in pyra_sysfs_write_settings()
authorDan Carpenter <dan.carpenter@oracle.com>
Fri, 9 Jan 2015 12:32:31 +0000 (15:32 +0300)
committerJiri Kosina <jkosina@suse.cz>
Fri, 9 Jan 2015 13:41:01 +0000 (14:41 +0100)
This is a static checker fix.  We write some binary settings to the
sysfs file.  One of the settings is the "->startup_profile".  There
isn't any checking to make sure it fits into the
pyra->profile_settings[] array in the profile_activated() function.

I added a check to pyra_sysfs_write_settings() in both places because
I wasn't positive that the other callers were correct.

Cc: <stable@vger.kernel.org>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
drivers/hid/hid-roccat-pyra.c

index 1a07e07..47d7e74 100644 (file)
@@ -35,6 +35,8 @@ static struct class *pyra_class;
 static void profile_activated(struct pyra_device *pyra,
                unsigned int new_profile)
 {
+       if (new_profile >= ARRAY_SIZE(pyra->profile_settings))
+               return;
        pyra->actual_profile = new_profile;
        pyra->actual_cpi = pyra->profile_settings[pyra->actual_profile].y_cpi;
 }
@@ -257,9 +259,11 @@ static ssize_t pyra_sysfs_write_settings(struct file *fp,
        if (off != 0 || count != PYRA_SIZE_SETTINGS)
                return -EINVAL;
 
-       mutex_lock(&pyra->pyra_lock);
-
        settings = (struct pyra_settings const *)buf;
+       if (settings->startup_profile >= ARRAY_SIZE(pyra->profile_settings))
+               return -EINVAL;
+
+       mutex_lock(&pyra->pyra_lock);
 
        retval = pyra_set_settings(usb_dev, settings);
        if (retval) {