linux-kernel - [PATCH AUTOSEL 4.14 20/66] jfs: Fix memleak in dbAdjCtl

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Message-Id: <20201223022253.2793452-20-sashal@kernel.org>
Date:   Tue, 22 Dec 2020 21:22:06 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Dinghao Liu <dinghao.liu@....edu.cn>,
        Dave Kleikamp <dave.kleikamp@...cle.com>,
        Sasha Levin <sashal@...nel.org>,
        jfs-discussion@...ts.sourceforge.net
Subject: [PATCH AUTOSEL 4.14 20/66] jfs: Fix memleak in dbAdjCtl

From: Dinghao Liu <dinghao.liu@....edu.cn>

[ Upstream commit 751341b4d7841e2b76e78eec382c2e119165497f ]

When dbBackSplit() fails, mp should be released to
prevent memleak. It's the same when dbJoin() fails.

Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
Signed-off-by: Dave Kleikamp <dave.kleikamp@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/jfs/jfs_dmap.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c
index 2d514c7affc2a..fa14a01950853 100644
--- a/fs/jfs/jfs_dmap.c
+++ b/fs/jfs/jfs_dmap.c
@@ -2562,15 +2562,19 @@ dbAdjCtl(struct bmap * bmp, s64 blkno, int newval, int alloc, int level)
 		 */
 		if (oldval == NOFREE) {
 			rc = dbBackSplit((dmtree_t *) dcp, leafno);
-			if (rc)
+			if (rc) {
+				release_metapage(mp);
 				return rc;
+			}
 			oldval = dcp->stree[ti];
 		}
 		dbSplit((dmtree_t *) dcp, leafno, dcp->budmin, newval);
 	} else {
 		rc = dbJoin((dmtree_t *) dcp, leafno, newval);
-		if (rc)
+		if (rc) {
+			release_metapage(mp);
 			return rc;
+		}
 	}
 
 	/* check if the root of the current dmap control page changed due
-- 
2.27.0