From: Garry McNulty <garrmcnu@gmail.com>
Date: Thu, 15 Nov 2018 22:25:58 +0000 (+0000)
Subject: ubifs: Fix memory leak on error condition
X-Git-Tag: rel_imx_5.10.35_2.0.0-somdevices.0~5740^2~4
X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=6554a56f352ee2a6ce295fcfb39889eb9ecc79cf;p=linux.git

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 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) {