linux-kernel - [PATCH] uio: Fix memory size check with vma in uio_mmap

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Date:	Wed, 12 Mar 2014 10:24:21 +0900
From:	Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@...esas.com>
To:	linux-kernel@...r.kernel.org
Cc:	gregkh@...uxfoundation.org,
	Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@...esas.com>
Subject: [PATCH] uio: Fix memory size check with vma in uio_mmap_physical()

Register for the device are mapped in uio_mmap_physical().
In this case, it might not be the same as the size of VMA always.
This uses PAGE_ALIGN to memory size, fix the check of the memory size
to be mapped.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@...esas.com>
---
 drivers/uio/uio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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;
-- 
1.8.5

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