linux-ext4 - [PATCH] debugfs: fix memory leak problem in read

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Message-ID: <c6fb0951-a472-dbb4-1970-fe9cece5d182@huawei.com>
Date:   Sat, 20 Feb 2021 16:41:29 +0800
From:   Zhiqiang Liu <liuzhiqiang26@...wei.com>
To:     Ext4 Developers List <linux-ext4@...r.kernel.org>,
        "Theodore Y. Ts'o" <tytso@....edu>
CC:     harshad shirwadkar <harshadshirwadkar@...il.com>,
        linfeilong <linfeilong@...wei.com>,
        lihaotian <lihaotian9@...wei.com>, <liuzhiqiang26@...wei.com>,
        "lijinlin (A)" <lijinlin3@...wei.com>
Subject: [PATCH] debugfs: fix memory leak problem in read_list()


In read_list func, if strtoull() fails in while loop,
we will return the error code directly. Then, memory of
variable lst will be leaked without setting to *list.

Signed-off-by: Zhiqiang Liu <liuzhiqiang26@...wei.com>
Signed-off-by: linfeilong <linfeilong@...wei.com>
---
 debugfs/util.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/debugfs/util.c b/debugfs/util.c
index be6b550e..9e880548 100644
--- a/debugfs/util.c
+++ b/debugfs/util.c
@@ -530,12 +530,16 @@ errcode_t read_list(char *str, blk64_t **list, size_t *len)

 		errno = 0;
 		y = x = strtoull(tok, &e, 0);
-		if (errno)
-			return errno;
+		if (errno) {
+			retval = errno;
+			break;
+		}
 		if (*e == '-') {
 			y = strtoull(e + 1, NULL, 0);
-			if (errno)
-				return errno;
+			if (errno) {
+				retval = errno;
+				break;
+			}
 		} else if (*e != 0) {
 			retval = EINVAL;
 			break;
-- 
2.19.1