Hi Dan,
(Adding Sagi CC')
On Tue, 2016-01-05 at 00:07 +0300, Dan Carpenter wrote:
> Hello Nicholas Bellinger,
>
> The patch b8d26b3be8b3: "iser-target: Add iSCSI Extensions for RDMA
> (iSER) target driver" from Mar 7, 2013, leads to the following static
> checker warning:
>
> drivers/infiniband/ulp/isert/ib_isert.c:423 isert_device_get()
> error: passing non negative 1 to ERR_PTR
>
> drivers/infiniband/ulp/isert/ib_isert.c
> 417
> 418 device->ib_device = cma_id->device;
> 419 ret = isert_create_device_ib_res(device);
> 420 if (ret) {
> 421 kfree(device);
> 422 mutex_unlock(&device_list_mutex);
> 423 return ERR_PTR(ret);
>
> The warning here is because isert_create_device_ib_res() returns either
> a negative error code, zero or one. The documentation is not clear what
> that means. AHAHAHAHAHAHAHAH. I joke. There is no documentation.
>
> Anyway, it's definitely a bug and it leads to a NULL dereference in the
> caller.
>
> 424 }
> 425
> 426 device->refcount++;
> 427 list_add_tail(&device->dev_node, &device_list);
> 428 isert_info("Created a new iser device %p refcount %d\n",
> 429 device, device->refcount);
> 430 mutex_unlock(&device_list_mutex);
> 431
> 432 return device;
> 433 }
>
Looking at the current code, AFAICT isert_alloc_comps() ->
ib_req_notify_cq() is the one case where this can happen, right..?
Here's a quick patch that I'm applying to target-pending/for-next, that
always returns negative upon isert_create_device_ib_res() failure.
Thanks Dan!
diff --git a/drivers/infiniband/ulp/isert/ib_isert.c
b/drivers/infiniband/ulp/isert/ib_isert.
index 91eb22c..8954e12 100644
--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -356,7 +356,7 @@ isert_create_device_ib_res(struct isert_device *device)
dev_attr = &device->dev_attr;
ret = isert_query_device(device->ib_device, dev_attr);
if (ret)
- return ret;
+ goto out;
/* asign function handlers */
if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
@@ -372,7 +372,7 @@ isert_create_device_ib_res(struct isert_device *device)
ret = isert_alloc_comps(device, dev_attr);
if (ret)
- return ret;
+ goto out;
device->pd = ib_alloc_pd(device->ib_device);
if (IS_ERR(device->pd)) {
@@ -390,6 +390,9 @@ isert_create_device_ib_res(struct isert_device *device)
out_cq:
isert_free_comps(device);
+out:
+ if (ret > 0)
+ ret = -EINVAL;
return ret;
}
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