[PATCH 2/4] dm era: Fix bitset memory leaks

[Nikos Tsironis <ntsironis@xxxxxxxxxxx>]

Deallocate the memory allocated for the in-core bitsets when destroying
the target and in error paths.

Fixes: eec40579d84873 ("dm: add era target")
Cc: stable@xxxxxxxxxxxxxxx # v3.15+
Signed-off-by: Nikos Tsironis <ntsironis@xxxxxxxxxxx>
---
 drivers/md/dm-era-target.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/md/dm-era-target.c b/drivers/md/dm-era-target.c
index 52e3f63335d3..ffbbd8740253 100644
--- a/drivers/md/dm-era-target.c
+++ b/drivers/md/dm-era-target.c
@@ -47,6 +47,7 @@ struct writeset {
 static void writeset_free(struct writeset *ws)
 {
 	vfree(ws->bits);
+	ws->bits = NULL;
 }
 
 static int setup_on_disk_bitset(struct dm_disk_bitset *info,
@@ -810,6 +811,8 @@ static struct era_metadata *metadata_open(struct block_device *bdev,
 
 static void metadata_close(struct era_metadata *md)
 {
+	writeset_free(&md->writesets[0]);
+	writeset_free(&md->writesets[1]);
 	destroy_persistent_data_objects(md);
 	kfree(md);
 }
@@ -847,6 +850,7 @@ static int metadata_resize(struct era_metadata *md, void *arg)
 	r = writeset_alloc(&md->writesets[1], *new_size);
 	if (r) {
 		DMERR("%s: writeset_alloc failed for writeset 1", __func__);
+		writeset_free(&md->writesets[0]);
 		return r;
 	}
 
@@ -857,6 +861,8 @@ static int metadata_resize(struct era_metadata *md, void *arg)
 			    &value, &md->era_array_root);
 	if (r) {
 		DMERR("%s: dm_array_resize failed", __func__);
+		writeset_free(&md->writesets[0]);
+		writeset_free(&md->writesets[1]);
 		return r;
 	}
 
-- 
2.11.0

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