[VIDEO] sbuslib: Disallow private mmaps.
The COW semantics just do not make any sense especially
with the physically discontiguous I/O mappings possible
here.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/video/sbuslib.c b/drivers/video/sbuslib.c
index 646c43f..3a74a63d 100644
--- a/drivers/video/sbuslib.c
+++ b/drivers/video/sbuslib.c
@@ -46,6 +46,9 @@
unsigned long off;
int i;
+ if (!(vma->vm_flags & (VM_SHARED | VM_MAYSHARE)))
+ return -EINVAL;
+
size = vma->vm_end - vma->vm_start;
if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
return -EINVAL;