This is a note to let you know that I've just added the patch titled vfio/pci: Add missing range check in vfio_pci_mmap to the 5.11-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-add-missing-range-check-in-vfio_pci_mmap.patch and it can be found in the queue-5.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 909290786ea335366e21d7f1ed5812b90f2f0a92 Mon Sep 17 00:00:00 2001 From: "Christian A. Ehrhardt" <lk@xxxxxxx> Date: Mon, 12 Apr 2021 23:41:24 +0200 Subject: vfio/pci: Add missing range check in vfio_pci_mmap From: Christian A. Ehrhardt <lk@xxxxxxx> commit 909290786ea335366e21d7f1ed5812b90f2f0a92 upstream. When mmaping an extra device region verify that the region index derived from the mmap offset is valid. Fixes: a15b1883fee1 ("vfio_pci: Allow mapping extra regions") Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Christian A. Ehrhardt <lk@xxxxxxx> Message-Id: <20210412214124.GA241759@xxxxxxxxxxxxxx> Reviewed-by: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx> Reviewed-by: Cornelia Huck <cohuck@xxxxxxxxxx> Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/vfio/pci/vfio_pci.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/drivers/vfio/pci/vfio_pci.c +++ b/drivers/vfio/pci/vfio_pci.c @@ -1658,6 +1658,8 @@ static int vfio_pci_mmap(void *device_da index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT); + if (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions) + return -EINVAL; if (vma->vm_end < vma->vm_start) return -EINVAL; if ((vma->vm_flags & VM_SHARED) == 0) @@ -1666,7 +1668,7 @@ static int vfio_pci_mmap(void *device_da int regnum = index - VFIO_PCI_NUM_REGIONS; struct vfio_pci_region *region = vdev->region + regnum; - if (region && region->ops && region->ops->mmap && + if (region->ops && region->ops->mmap && (region->flags & VFIO_REGION_INFO_FLAG_MMAP)) return region->ops->mmap(vdev, region, vma); return -EINVAL; Patches currently in stable-queue which might be from lk@xxxxxxx are queue-5.11/vfio-pci-add-missing-range-check-in-vfio_pci_mmap.patch