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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2020-10-23 14:29:47 +0300 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2020-11-03 21:07:19 +0300 |
| commit | 69848cd6f0c1fb4f82ab255b730343a215ded013 (patch) | |
| tree | 42e2f57377c275cef4d7dfc99dfdef983f5a2771 /drivers/vfio/fsl-mc/vfio_fsl_mc.c | |
| parent | 09699e56dee946a16767021af97411ed6f4b3e6b (diff) | |
| download | linux-69848cd6f0c1fb4f82ab255b730343a215ded013.tar.xz | |
vfio/fsl-mc: prevent underflow in vfio_fsl_mc_mmap()
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: 67247289688d ("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>
Diffstat (limited to 'drivers/vfio/fsl-mc/vfio_fsl_mc.c')
| -rw-r--r-- | drivers/vfio/fsl-mc/vfio_fsl_mc.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c index 21f22e3da11f..f27e25112c40 100644 --- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c +++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c @@ -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); |