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The commit
a5886ef4f4 ("gve: Introduce per netdev `enum gve_queue_format`")
introduces three queue format type, only GVE_GQI_QPL_FORMAT queue has
page list. So it should use the queue page list number to detect the
zero size queue page list. Correct the design logic.
Using the 'queue_format == GVE_GQI_RDA_FORMAT' may lead to request zero
sized memory allocation, like if the queue format is GVE_DQO_RDA_FORMAT.
The kernel memory subsystem will return ZERO_SIZE_PTR, which is not NULL
address, so the driver can run successfully. Also the code still checks
the queue page list number firstly, then accesses the allocated memory,
so zero number queue page list allocation will not lead to access fault.
Signed-off-by: Haiyue Wang <haiyue.wang@intel.com>
Reviewed-by: Bailey Forrest <bcf@google.com>
Link: https://lore.kernel.org/r/20220215051751.260866-1-haiyue.wang@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.