If wrong option is given then we are returning but we missed releasing
the workqueue and pstore.
Add an error path and use it to correctly release resources on failure.
Fixes: b0d3cc011e53 ("dm snapshot: add new persistent store option to support overflow")
Signed-off-by: Sudip Mukherjee <sudip@xxxxxxxxxxxxxxx>
---
drivers/md/dm-snap-persistent.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/md/dm-snap-persistent.c b/drivers/md/dm-snap-persistent.c
index 229be55..5ff7c23 100644
--- a/drivers/md/dm-snap-persistent.c
+++ b/drivers/md/dm-snap-persistent.c
@@ -847,6 +847,7 @@ static void persistent_drop_snapshot(struct dm_exception_store *store)
static int persistent_ctr(struct dm_exception_store *store, char *options)
{
struct pstore *ps;
+ int ret;
/* allocate the pstore */
ps = kzalloc(sizeof(*ps), GFP_KERNEL);
@@ -868,9 +869,9 @@ static int persistent_ctr(struct dm_exception_store *store, char *options)
ps->metadata_wq = alloc_workqueue("ksnaphd", WQ_MEM_RECLAIM, 0);
if (!ps->metadata_wq) {
- kfree(ps);
DMERR("couldn't start header metadata update thread");
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto err_free_ps;
}
if (options) {
@@ -879,13 +880,20 @@ static int persistent_ctr(struct dm_exception_store *store, char *options)
store->userspace_supports_overflow = true;
else {
DMERR("Unsupported persistent store option: %s", options);
- return -EINVAL;
+ ret = -EINVAL;
+ goto err_option;
}
}
store->context = ps;
return 0;
+
+err_option:
+ destroy_workqueue(ps->metadata_wq);
+err_free_ps:
+ kfree(ps);
+ return ret;
}
static unsigned persistent_status(struct dm_exception_store *store,
--
1.9.1
--
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