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authorBin Wang <binw@marvell.com>2014-03-25 13:52:06 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-05-27 14:11:06 -0700
commitddb09754e6c7239e302c7b675df9bbd415f8de5d (patch)
treeb8bb721fe4a516240583e740c33d751df2eb28c6
parentca3c61f358d8e5a4b2732d6aa81ac46f677e69f0 (diff)
downloadop-kernel-dev-ddb09754e6c7239e302c7b675df9bbd415f8de5d.zip
op-kernel-dev-ddb09754e6c7239e302c7b675df9bbd415f8de5d.tar.gz
uio: fix vma io range check in mmap
the vma range size is always page size aligned in mmap, while the real io space range may not be page aligned, thus leading to range check failure in the uio_mmap_physical(). for example, in a case of io range size "mem->size == 1KB", and we have (vma->vm_end - vma->vm_start) == 4KB, due to "len" is aligned to page size in do_mmap_pgoff(). now fix this issue by align mem->size to page size in the check. Signed-off-by: Bin Wang <binw@marvell.com> Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/uio/uio.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index a673e5b..e371f5a 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -655,7 +655,7 @@ static int uio_mmap_physical(struct vm_area_struct *vma)
if (mem->addr & ~PAGE_MASK)
return -ENODEV;
- if (vma->vm_end - vma->vm_start > mem->size)
+ if (vma->vm_end - vma->vm_start > PAGE_ALIGN(mem->size))
return -EINVAL;
vma->vm_ops = &uio_physical_vm_ops;
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