ARM: 8874/1: mm: only adjust sections of valid mm structures

A timing hazard exists when an early fork/exec thread begins
exiting and sets its mm pointer to NULL while a separate core
tries to update the section information.

This commit ensures that the mm pointer is not NULL before
setting its section parameters. The arguments provided by
commit 11ce4b33aedc ("ARM: 8672/1: mm: remove tasklist locking
from update_sections_early()") are equally valid for not
requiring grabbing the task_lock around this check.

Fixes: 08925c2f124f ("ARM: 8464/1: Update all mm structures with section adjustments")
Signed-off-by: Doug Berger <[email protected]>
Acked-by: Laura Abbott <[email protected]>
Cc: Mike Rapoport <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Florian Fainelli <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: "Steven Rostedt (VMware)" <[email protected]>
Cc: Peng Fan <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Signed-off-by: Russell King <[email protected]>

0 files changed, 0 insertions, 0 deletions