@@ -267,11 +267,18 @@ static struct ubifs_znode *dirty_cow_znode(struct ubifs_info *c,
if (zbr->len) {
err = insert_old_idx(c, zbr->lnum, zbr->offs);
if (unlikely(err))
- return ERR_PTR(err);
+ /*
+ * Obsolete znodes will be freed by tnc_destroy_cnext()
+ * or free_obsolete_znodes(), copied up znodes should
+ * be added back to tnc and freed by
+ * ubifs_destroy_tnc_subtree().
+ */
+ goto out;
err = add_idx_dirt(c, zbr->lnum, zbr->len);
} else
err = 0;
+out:
zbr->znode = zn;
zbr->lnum = 0;
zbr->offs = 0;
Following process will cause a memleak for copied up znode: dirty_cow_znode zn = copy_znode(c, znode); err = insert_old_idx(c, zbr->lnum, zbr->offs); if (unlikely(err)) return ERR_PTR(err); // No one refers to zn. Fix it by adding copied znode back to tnc, then it will be freed by ubifs_destroy_tnc_subtree() while closing tnc. Fetch a reproducer in [Link]. Link: https://bugzilla.kernel.org/show_bug.cgi?id=216705 Fixes: 1e51764a3c2a ("UBIFS: add new flash file system") Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com> --- fs/ubifs/tnc.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)