linux-kernel - infiniband/hw/amso1100/c2_provider.c: possible NULL dereference

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Date:	Wed, 8 Nov 2006 17:28:32 +0100
From:	Adrian Bunk <bunk@...sta.de>
To:	Tom Tucker <tom@...ngridcomputing.com>,
	Steve Wise <swise@...ngridcomputing.com>
Cc:	openib-general@...nib.org, linux-kernel@...r.kernel.org
Subject: infiniband/hw/amso1100/c2_provider.c: possible NULL dereference

The Coverity checker noted the following in 
drivers/infiniband/hw/amso1100/c2_provider.c:

<--  snip  -->

...
int c2_register_device(struct c2_dev *dev)
{
        int ret;
        int i;

        /* Register pseudo network device */
        dev->pseudo_netdev = c2_pseudo_netdev_init(dev);
        if (dev->pseudo_netdev) {
                ret = register_netdev(dev->pseudo_netdev);
                if (ret) {
                        printk(KERN_ERR PFX
                                "Unable to register netdev, ret = %d\n", ret);
                        free_netdev(dev->pseudo_netdev);
                        return ret;
                }
        }

        pr_debug("%s:%u\n", __FUNCTION__, __LINE__);
        strlcpy(dev->ibdev.name, "amso%d", IB_DEVICE_NAME_MAX);
        dev->ibdev.owner = THIS_MODULE;
        dev->ibdev.uverbs_cmd_mask =
            (1ull << IB_USER_VERBS_CMD_GET_CONTEXT) |
            (1ull << IB_USER_VERBS_CMD_QUERY_DEVICE) |
            (1ull << IB_USER_VERBS_CMD_QUERY_PORT) |
            (1ull << IB_USER_VERBS_CMD_ALLOC_PD) |
            (1ull << IB_USER_VERBS_CMD_DEALLOC_PD) |
            (1ull << IB_USER_VERBS_CMD_REG_MR) |
            (1ull << IB_USER_VERBS_CMD_DEREG_MR) |
            (1ull << IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL) |
            (1ull << IB_USER_VERBS_CMD_CREATE_CQ) |
            (1ull << IB_USER_VERBS_CMD_DESTROY_CQ) |
            (1ull << IB_USER_VERBS_CMD_REQ_NOTIFY_CQ) |
            (1ull << IB_USER_VERBS_CMD_CREATE_QP) |
            (1ull << IB_USER_VERBS_CMD_MODIFY_QP) |
            (1ull << IB_USER_VERBS_CMD_POLL_CQ) |
            (1ull << IB_USER_VERBS_CMD_DESTROY_QP) |
            (1ull << IB_USER_VERBS_CMD_POST_SEND) |
            (1ull << IB_USER_VERBS_CMD_POST_RECV);

        dev->ibdev.node_type = RDMA_NODE_RNIC;
        memset(&dev->ibdev.node_guid, 0, sizeof(dev->ibdev.node_guid));
        memcpy(&dev->ibdev.node_guid, dev->pseudo_netdev->dev_addr, 6);
...                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

<--  snip  -->

Above there's an "if (dev->pseudo_netdev)" check, but here it's 
dereferenced without a check.

It seems instead of the "if (dev->pseudo_netdev)", there should be some 
kind of

  if (!dev->pseudo_netdev)
  	return -ESOME_ERROR;


cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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