From: Lao Wei zrlw@qq.com
[ 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 --- drivers/media/pci/meye/meye.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/media/pci/meye/meye.c b/drivers/media/pci/meye/meye.c index 49e047e4a81ee..926707c997acb 100644 --- a/drivers/media/pci/meye/meye.c +++ b/drivers/media/pci/meye/meye.c @@ -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; }