[PATCH 5.10 651/663] dm era: Fix bitset memory leaks

[Greg Kroah-Hartman]

From: Nikos Tsironis <ntsiro...@arrikto.com>

commit 904e6b266619c2da5c58b5dce14ae30629e39645 upstream.

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

Fixes: eec40579d84873 ("dm: add era target")
Cc: sta...@vger.kernel.org # v3.15+
Signed-off-by: Nikos Tsironis <ntsiro...@arrikto.com>
Reviewed-by: Ming-Hung Tsai <mt...@redhat.com>
Signed-off-by: Mike Snitzer <snit...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/md/dm-era-target.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- 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,
@@ -811,6 +812,8 @@ static struct era_metadata *metadata_ope
 
 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);
 }
@@ -848,6 +851,7 @@ static int metadata_resize(struct era_me
        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;
        }
 
@@ -858,6 +862,8 @@ static int metadata_resize(struct era_me
                            &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;
        }