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

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[ 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>
This commit is contained in:
Lao Wei 2018-07-09 08:15:53 -04:00 committed by Greg Kroah-Hartman
parent 9b8ba684be
commit 5e19fb9b96
1 changed files with 1 additions and 1 deletions
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2
drivers/media/pci/meye/meye.c
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@ -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;
}