[PATCH 4.9 83/83] ovl: check whiteout in ovl_create_over_whiteout()

4.9-stable review patch. If anyone has any objections, please let me know. -- From: Miklos Szeredi commit 5e1275808630ea3b2c97c776f40e475017535f72 upstream. Kaixuxia repors that it's possible to crash overlayfs by removing the whiteout on the upper layer before creating a

[PATCH 4.9 83/83] ovl: check whiteout in ovl_create_over_whiteout()

4.9-stable review patch. If anyone has any objections, please let me know. -- From: Miklos Szeredi commit 5e1275808630ea3b2c97c776f40e475017535f72 upstream. Kaixuxia repors that it's possible to crash overlayfs by removing the whiteout on the upper layer before creating a