[PATCH v2 0/2] mm: Don't access uninitialized memmaps in PFN walkers

From: David Hildenbrand
Date: Wed Oct 09 2019 - 10:24:45 EST

This is the follow-up of:
[PATCH v1] mm: Fix access of uninitialized memmaps in fs/proc/page.c

We have multiple places where we might access uninitialized memmaps and
trigger kernel BUGs. Make sure to only access initialized memmaps.

Some of these places got easier to trigger with:
[PATCH v6 00/10] mm/memory_hotplug: Shrink zones before removing memory
As memmaps are now also poisoned when memory is offlined, before it is
actually removed.

v1 -> v2:
- Drop ZONE_DEVICE support from the /proc/k... files as requested by Michal
- Further simplify the code
- Split up into two patches

David Hildenbrand (2):
mm: Don't access uninitialized memmaps in fs/proc/page.c
mm/memory-failure.c: Don't access uninitialized memmaps in

fs/proc/page.c | 28 ++++++++++++++++------------
mm/memory-failure.c | 14 ++++++++------
2 files changed, 24 insertions(+), 18 deletions(-)