net: qlogic: qlcnic: Fix a NULL pointer dereference in qlcnic_83xx_add_rings()

In the Linux kernel, the following vulnerability has been resolved:

net: qlogic: qlcnic: Fix a NULL pointer dereference in qlcnic_83xx_add_rings()

In qlcnic_83xx_add_rings(), the indirect function of

ahw->hw_ops->alloc_mbx_args will be called to allocate memory for

cmd.req.arg, and there is a dereference of it in qlcnic_83xx_add_rings(),

which could lead to a NULL pointer dereference on failure of the

indirect function like qlcnic_83xx_alloc_mbx_args().

Fix this bug by adding a check of alloc_mbx_args(), this patch

imitates the logic of mbx_cmd()'s failure handling.

This bug was found by a static analyzer. The analysis employs

differential checking to identify inconsistent security operations

(e.g., checks or kfrees) between two code paths and confirms that the

inconsistent operations are not recovered in the current function or

the callers, so they constitute bugs.

Note that, as a bug found by static analysis, it can be a false

positive or hard to trigger. Multiple researchers have cross-reviewed

the bug.

Builds with CONFIG_QLCNIC=m show no new warnings, and our

static analyzer no longer warns about this code.