rapidio: fix potential NULL pointer dereference

The change fixes improper check for a returned error value by
class_create() function, which on error returns ERR_PTR() value, thus the
original check always results in a dead code on error path.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/rapidio/devices/rio_mport_cdev.c b/drivers/rapidio/devices/rio_mport_cdev.c
index 5d4d918..96168b8 100644 (file)
--- a/drivers/rapidio/devices/rio_mport_cdev.c
+++ b/drivers/rapidio/devices/rio_mport_cdev.c
@@ -2669,9 +2669,9 @@ static int __init mport_init(void)
 
        /* Create device class needed by udev */
        dev_class = class_create(THIS_MODULE, DRV_NAME);
-       if (!dev_class) {
+       if (IS_ERR(dev_class)) {
                rmcd_error("Unable to create " DRV_NAME " class");
-               return -EINVAL;
+               return PTR_ERR(dev_class);
        }
 
        ret = alloc_chrdev_region(&dev_number, 0, RIO_MAX_MPORTS, DRV_NAME);