[PATCH v2] ubifs: fix memory leak on error condition

[Garry McNulty]

If the call to ubifs_read_nnode() fails in ubifs_lpt_calc_hash() an
error is returned without freeing the memory allocated to 'buf'.
Read and check the root node before allocating the buffer.

Detected by CoverityScan, CID 1441025 ("Resource leak")

Signed-off-by: Garry McNulty <garrm...@gmail.com>
---
 fs/ubifs/lpt.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/ubifs/lpt.c b/fs/ubifs/lpt.c
index d1d5e96350dd..b0c5f06128b5 100644
--- a/fs/ubifs/lpt.c
+++ b/fs/ubifs/lpt.c
@@ -1675,6 +1675,12 @@ int ubifs_lpt_calc_hash(struct ubifs_info *c, u8 *hash)
        if (!ubifs_authenticated(c))
                return 0;
 
+       if (!c->nroot) {
+               err = ubifs_read_nnode(c, NULL, 0);
+               if (err)
+                       return err;
+       }
+
        desc = ubifs_hash_get_desc(c);
        if (IS_ERR(desc))
                return PTR_ERR(desc);
@@ -1685,12 +1691,6 @@ int ubifs_lpt_calc_hash(struct ubifs_info *c, u8 *hash)
                goto out;
        }
 
-       if (!c->nroot) {
-               err = ubifs_read_nnode(c, NULL, 0);
-               if (err)
-                       return err;
-       }
-
        cnode = (struct ubifs_cnode *)c->nroot;
 
        while (cnode) {
-- 
2.14.5