Commit 03056f8c authored Jul 09, 2018 by Lao Wei Committed by Greg Kroah-Hartman Nov 20, 2019

media: fix: media: pci: meye: validate offset to avoid arbitrary access

[ Upstream commit eac7230fdb4672c2cb56f6a01a1744f562c01f80 ]

Motion eye video4linux driver for Sony Vaio PictureBook desn't validate user-controlled parameter
'vma->vm_pgoff', a malicious process might access all of kernel memory from user space by trying
pass different arbitrary address.
Discussion: http://www.openwall.com/lists/oss-security/2018/07/06/1



Signed-off-by: Lao Wei <zrlw@qq.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

parent fe384ab1

drivers/media/pci/meye/meye.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1460,7 +1460,7 @@ static int meye_mmap(struct file file, struct vm_area_struct vma)
		unsigned long page, pos;

		mutex_lock(&meye.lock);
		if (size > gbuffers * gbufsize) {
		if (size > gbuffers * gbufsize \|\| offset > gbuffers * gbufsize - size) {
		mutex_unlock(&meye.lock);
		return -EINVAL;
		}