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dm space map metadata: fix 'struct sm_metadata' leak on failed create

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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 <[email protected]>
Acked-by: Joe Thornber <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Cc: [email protected]
This commit is contained in:
Benjamin Marzinski 2016-11-30 17:56:14 -06:00 • committed by Mike Snitzer
commit 314c25c56c
1 changed files with 6 additions and 8 deletions
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16
drivers/md/persistent-data/dm-space-map-metadata.c
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@ -775,16 +775,14 @@ 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)
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;
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;
/*
* Now we need to update the newly created data structures with the