ubifs: Fix memory leak on error condition
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 <garrmcnu@gmail.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
diff --git a/fs/ubifs/lpt.c b/fs/ubifs/lpt.c
index d1d5e96..b0c5f06 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) {