vfio: fix ioctl error handling

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[ Upstream commit 8160c4e455 ]

Calling return copy_to_user(...) in an ioctl will not
do the right thing if there's a pagefault:
copy_to_user returns the number of bytes not copied
in this case.

Fix up vfio to do
	return copy_to_user(...)) ?
		-EFAULT : 0;

everywhere.

Cc: stable@vger.kernel.org
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

...

This commit is contained in:

Michael S. Tsirkin 2016-02-28 16:31:39 +02:00 • committed by Sasha Levin

parent fa3fd2474b

commit bad24c7e02

2 changed files with 10 additions and 5 deletions

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9

drivers/vfio/pci/vfio_pci.c

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6

drivers/vfio/vfio_iommu_type1.c

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