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vfio: Prevent open_count decrement to negative

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[ Upstream commit 982ddd59ed97dc7e63efd97ed50273ffb817bd41 ]

When vfio_df_close() is called with open_count=0, it triggers a warning in
vfio_assert_device_open() but still decrements open_count to -1. This allows
a subsequent open to incorrectly pass the open_count == 0 check, leading to
unintended behavior, such as setting df->access_granted = true.

For example, running an IOMMUFD compat no-IOMMU device with VFIO tests
(https://github.com/awilliam/tests/blob/master/vfio-noiommu-pci-device-open.c)
results in a warning and a failed VFIO_GROUP_GET_DEVICE_FD ioctl on the first
run, but the second run succeeds incorrectly.

Add checks to avoid decrementing open_count below zero.

Fixes: 05f37e1c03 ("vfio: Pass struct vfio_device_file * to vfio_device_open/close()")
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Jacob Pan <jacob.pan@linux.microsoft.com>
Link: https://lore.kernel.org/r/20250618234618.1910456-2-jacob.pan@linux.microsoft.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jacob Pan
2025-06-18 16:46:18 -07:00
committed by Greg Kroah-Hartman
parent a6c5e25861
commit 9546b26d39
1 changed files with 2 additions and 1 deletions
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3
drivers/vfio/vfio_main.c
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@@ -537,7 +537,8 @@ void vfio_df_close(struct vfio_device_file *df)
lockdep_assert_held(&device->dev_set->lock);
vfio_assert_device_open(device);
if (!vfio_assert_device_open(device))
return;
if (device->open_count == 1)
vfio_df_device_last_close(df);
device->open_count--;