commit e445ee65cbefaa19131c972ae7fe221c95cf4cc4
author David S. Miller <davem@sunset.davemloft.net> Sat Dec 24 12:06:10 2005 -0800
committer David S. Miller <davem@sunset.davemloft.net> Sat Dec 24 12:06:10 2005 -0800
tree 2f7e4639069e3a1c5a5457d6fc879f02f0e9977c
parent 597d1f0622d21ffe54aceef8da9682e776f51cc2

[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>

drivers/video/sbuslib.c

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;