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charset="utf-8" vfio_realize() has the following flow: 1. vfio_bars_prepare() -- sets VFIOBAR->size. 2. msix_early_setup(). 3. vfio_bars_register() -- allocates VFIOBAR->mr. After vfio_bars_prepare() is called msix_early_setup() can fail. If it does fail, vfio_bars_register() is never called and VFIOBAR->mr is not allocated. In this case, vfio_bars_finalize() is called as part of the error flow to free the bars' resources. However, vfio_bars_finalize() calls object_unparent() for VFIOBAR->mr after checking only VFIOBAR->size, and thus we get a null pointer dereference. Fix it by checking VFIOBAR->mr in vfio_bars_finalize(). Fixes: 89d5202edc50 ("vfio/pci: Allow relocating MSI-X MMIO") Signed-off-by: Avihai Horon Reviewed-by: Alex Williamson Reviewed-by: C=C3=A9dric Le Goater Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- Changes from v1: * Assert VFIOBAR->size and set VFIOBAR->mr to NULL to make the code more accurate. (Philippe) * Small reword in the last paragraph of the commit message. hw/vfio/pci.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index ab6645ba60..bc98791cbb 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -1752,9 +1752,11 @@ static void vfio_bars_finalize(VFIOPCIDevice *vdev) =20 vfio_bar_quirk_finalize(vdev, i); vfio_region_finalize(&bar->region); - if (bar->size) { + if (bar->mr) { + assert(bar->size); object_unparent(OBJECT(bar->mr)); g_free(bar->mr); + bar->mr =3D NULL; } } =20 --=20 2.26.3