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| author |   Dan Carpenter <dan.carpenter@oracle.com> | 2020-06-10 11:58:52 +0300 |
|---|---|---|
| committer |   Michael S. Tsirkin <mst@redhat.com> | 2020-06-22 12:34:21 -0400 |
| commit | c09cc2c319863f620caf5e723db496eed55f7c7f (patch) | |
| tree | a4e02555cb4414ee5a511125fbd063adafa31785 /drivers/vhost | |
| parent | vdpa: fix typos in the comments for __vdpa_alloc_device() (diff) | |
| download | wireguard-linux-c09cc2c319863f620caf5e723db496eed55f7c7f.tar.xz wireguard-linux-c09cc2c319863f620caf5e723db496eed55f7c7f.zip | |
vhost_vdpa: Fix potential underflow in vhost_vdpa_mmap()
The "vma->vm_pgoff" variable is an unsigned long so if it's larger than
INT_MAX then "index" can be negative leading to an underflow. Fix this
by changing the type of "index" to "unsigned long".
Fixes: ddd89d0a059d ("vhost_vdpa: support doorbell mapping via mmap")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20200610085852.GB5439@mwanda
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/vhost')
| -rw-r--r-- | drivers/vhost/vdpa.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index 7580e34f76c1..a54b60d6623f 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -818,7 +818,7 @@ static int vhost_vdpa_mmap(struct file *file, struct vm_area_struct *vma) struct vdpa_device *vdpa = v->vdpa; const struct vdpa_config_ops *ops = vdpa->config; struct vdpa_notification_area notify; - int index = vma->vm_pgoff; + unsigned long index = vma->vm_pgoff; if (vma->vm_end - vma->vm_start != PAGE_SIZE) return -EINVAL; |