dm cache: fix use after freeing migrations

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Both free_io_migration() and issue_discard() dereference a migration
that was just freed.  Fix those by saving off the migrations's cache
object before freeing the migration.  Also cleanup needless mg->cache
dereferences now that the cache object is available directly.

Fixes: e44b6a5a3c ("dm cache: move wake_waker() from free_migrations() to where it is needed")
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

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Joe Thornber 2015-09-01 11:38:19 +01:00 • committed by Mike Snitzer

parent dc9cee5db5

commit cc7da0ba9c

1 changed files with 9 additions and 6 deletions

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drivers/md/dm-cache-target.c

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