This is a note to let you know that I've just added the patch titled vfio/pci: Allow VPD short read to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: vfio-pci-allow-vpd-short-read.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From ce7585f3c4d76bca1dff4b66ae1ea32552954f9e Mon Sep 17 00:00:00 2001 From: Alex Williamson <alex.williamson@xxxxxxxxxx> Date: Tue, 31 May 2016 21:25:52 -0600 Subject: vfio/pci: Allow VPD short read From: Alex Williamson <alex.williamson@xxxxxxxxxx> commit ce7585f3c4d76bca1dff4b66ae1ea32552954f9e upstream. The size of the VPD area is not necessarily 4-byte aligned, so a pci_vpd_read() might return less than 4 bytes. Zero our buffer and accept anything other than an error. Intel X710 NICs exercise this. Fixes: 4e1a635552d3 ("vfio/pci: Use kernel VPD access functions") Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/vfio/pci/vfio_pci_config.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/vfio/pci/vfio_pci_config.c +++ b/drivers/vfio/pci/vfio_pci_config.c @@ -698,7 +698,8 @@ static int vfio_vpd_config_write(struct if (pci_write_vpd(pdev, addr & ~PCI_VPD_ADDR_F, 4, &data) != 4) return count; } else { - if (pci_read_vpd(pdev, addr, 4, &data) != 4) + data = 0; + if (pci_read_vpd(pdev, addr, 4, &data) < 0) return count; *pdata = cpu_to_le32(data); } Patches currently in stable-queue which might be from alex.williamson@xxxxxxxxxx are queue-4.4/vfio-pci-allow-vpd-short-read.patch