linux-kernel - [PATCH] ubifs: do_kill_orphans: Fix a memory leak bug

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Date:   Tue, 29 Oct 2019 17:01:10 +0800
From:   Zhihao Cheng <chengzhihao1@...wei.com>
To:     <richard@....at>, <s.hauer@...gutronix.de>, <dedekind1@...il.com>,
        <yi.zhang@...wei.com>
CC:     <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] ubifs: do_kill_orphans: Fix a memory leak bug

If there are more than one valid snod on the sleb->nodes list,
do_kill_orphans will malloc ino more than once without releasing
previous ino's memory. Finally, it will trigger memory leak.

Fixes: ee1438ce5dc4 ("ubifs: Check link count of inodes when...")
Signed-off-by: Zhihao Cheng <chengzhihao1@...wei.com>
Signed-off-by: zhangyi (F) <yi.zhang@...wei.com>
---
 fs/ubifs/orphan.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/fs/ubifs/orphan.c b/fs/ubifs/orphan.c
index 3b4b411..f211ed3 100644
--- a/fs/ubifs/orphan.c
+++ b/fs/ubifs/orphan.c
@@ -673,9 +673,11 @@ static int do_kill_orphans(struct ubifs_info *c, struct ubifs_scan_leb *sleb,
 		if (first)
 			first = 0;
 
-		ino = kmalloc(UBIFS_MAX_INO_NODE_SZ, GFP_NOFS);
-		if (!ino)
-			return -ENOMEM;
+		if (!ino) {
+			ino = kmalloc(UBIFS_MAX_INO_NODE_SZ, GFP_NOFS);
+			if (!ino)
+				return -ENOMEM;
+		}
 
 		n = (le32_to_cpu(orph->ch.len) - UBIFS_ORPH_NODE_SZ) >> 3;
 		for (i = 0; i < n; i++) {
-- 
2.7.4