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vfio/fsl-mc: prevent underflow in vfio_fsl_mc_mmap()

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My static analsysis tool complains that the "index" can be negative.
There are some checks in do_mmap() which try to prevent underflows but
I don't know if they are sufficient for this situation.  Either way,
making "index" unsigned is harmless so let's do it just to be safe.

Fixes: 6724728968 ("vfio/fsl-mc: Allow userspace to MMAP fsl-mc device MMIO regions")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Diana Craciun <diana.craciun@oss.nxp.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Dan Carpenter 2020-10-23 14:29:47 +03:00 committed by Alex Williamson
parent 09699e56de
commit 69848cd6f0
1 changed files with 1 additions and 1 deletions
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2
drivers/vfio/fsl-mc/vfio_fsl_mc.c
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@ -472,7 +472,7 @@ static int vfio_fsl_mc_mmap(void *device_data, struct vm_area_struct *vma)
{
struct vfio_fsl_mc_device *vdev = device_data;
struct fsl_mc_device *mc_dev = vdev->mc_dev;
int index;
unsigned int index;
index = vma->vm_pgoff >> (VFIO_FSL_MC_OFFSET_SHIFT - PAGE_SHIFT);