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The variable num_active_queues represents the number of active queues we have for the device. We assign this pretty early in i40evf_init_subtask. Several code locations are written with loops over the tx_rings and rx_rings structures, which don't get allocated until i40evf_alloc_queues, and which get freed by i40evf_free_queues. These call sites were written under the assumption that tx_rings and rx_rings would always be allocated at least when num_active_queues is non-zero. Lets fix this by moving the assignment into the function where we allocate queues. We'll use a temporary variable for storage so that we don't assign the value in the adapter structure until after the rings have been set up. Finally, when we free the queues, we'll clear the value to ensure that we do not loop over the rings memory that no longer exists. This resolves a possible NULL pointer dereference in i40evf_get_ethtool_stats which could occur if the VF fails to recover from a reset, and then a user requests statistics. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Tested-by: Andrew Bowers <andrewx.bowers@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.