1 files changed, 11 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 216f52b744a6..c882ea94172c 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1824,6 +1824,16 @@ i915_gem_sw_finish_ioctl(struct drm_device *dev, void *data,
         return 0;
 }
 
+static inline bool
+__vma_matches(struct vm_area_struct *vma, struct file *filp,
+              unsigned long addr, unsigned long size)
+{
+        if (vma->vm_file != filp)
+                return false;
+
+        return vma->vm_start == addr && (vma->vm_end - vma->vm_start) == size;
+}
+
 /**
  * i915_gem_mmap_ioctl - Maps the contents of an object, returning the address
  *                       it is mapped to.
@@ -1882,7 +1892,7 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
                         return -EINTR;
                 }
                 vma = find_vma(mm, addr);
-                if (vma)
+                if (vma && __vma_matches(vma, obj->base.filp, addr, args->size))
                         vma->vm_page_prot =
                                 pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
                 else