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authorBenjamin Marzinski <bmarzins@redhat.com>2016-11-30 17:56:14 -0600
committerMike Snitzer <snitzer@redhat.com>2016-12-08 14:13:14 -0500
commit314c25c56c1ee5026cf99c570bdfe01847927acb (patch)
tree4604a1b45470b23a13afb18015fc60af3b8d263f /drivers/md/persistent-data
parent58fc4fedee4a6e6e42f01da6ebaa0de0088fc8e3 (diff)
dm space map metadata: fix 'struct sm_metadata' leak on failed create
In dm_sm_metadata_create() we temporarily change the dm_space_map operations from 'ops' (whose .destroy function deallocates the sm_metadata) to 'bootstrap_ops' (whose .destroy function doesn't). If dm_sm_metadata_create() fails in sm_ll_new_metadata() or sm_ll_extend(), it exits back to dm_tm_create_internal(), which calls dm_sm_destroy() with the intention of freeing the sm_metadata, but it doesn't (because the dm_space_map operations is still set to 'bootstrap_ops'). Fix this by setting the dm_space_map operations back to 'ops' if dm_sm_metadata_create() fails when it is set to 'bootstrap_ops'. Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com> Acked-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/md/persistent-data')
-rw-r--r--drivers/md/persistent-data/dm-space-map-metadata.c14
1 files changed, 6 insertions, 8 deletions
diff --git a/drivers/md/persistent-data/dm-space-map-metadata.c b/drivers/md/persistent-data/dm-space-map-metadata.c
index 7e44005595c1..20557e2c60c6 100644
--- a/drivers/md/persistent-data/dm-space-map-metadata.c
+++ b/drivers/md/persistent-data/dm-space-map-metadata.c
@@ -775,17 +775,15 @@ int dm_sm_metadata_create(struct dm_space_map *sm,
memcpy(&smm->sm, &bootstrap_ops, sizeof(smm->sm));
r = sm_ll_new_metadata(&smm->ll, tm);
+ if (!r) {
+ if (nr_blocks > DM_SM_METADATA_MAX_BLOCKS)
+ nr_blocks = DM_SM_METADATA_MAX_BLOCKS;
+ r = sm_ll_extend(&smm->ll, nr_blocks);
+ }
+ memcpy(&smm->sm, &ops, sizeof(smm->sm));
if (r)
return r;
- if (nr_blocks > DM_SM_METADATA_MAX_BLOCKS)
- nr_blocks = DM_SM_METADATA_MAX_BLOCKS;
- r = sm_ll_extend(&smm->ll, nr_blocks);
- if (r)
- return r;
-
- memcpy(&smm->sm, &ops, sizeof(smm->sm));
-
/*
* Now we need to update the newly created data structures with the
* allocated blocks that they were built from.