linux-ext4 - [PATCH 11/12] misc/lsattr: check whether path is NULL in, lsattr_dir

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Date:   Mon, 24 May 2021 19:25:56 +0800
From:   Wu Guanghao <wuguanghao3@...wei.com>
To:     <linux-ext4@...r.kernel.org>
CC:     <liuzhiqiang26@...wei.com>, <linfeilong@...wei.com>
Subject: [PATCH 11/12] misc/lsattr: check whether path is NULL in,
 lsattr_dir_proc()

In lsattr_dir_proc(), if malloc() return NULL, it will cause
a segmentation fault problem.

Signed-off-by: Zhiqiang Liu <liuzhiqiang26@...wei.com>
Signed-off-by: Wu Guanghao <wuguanghao3@...wei.com>
---
 misc/lsattr.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/misc/lsattr.c b/misc/lsattr.c
index 0d954376..f3212069 100644
--- a/misc/lsattr.c
+++ b/misc/lsattr.c
@@ -144,6 +144,12 @@ static int lsattr_dir_proc (const char * dir_name, struct dirent * de,
 	int dir_len = strlen(dir_name);

 	path = malloc(dir_len + strlen (de->d_name) + 2);
+	if (!path) {
+		fprintf(stderr, "%s",
+			_("Couldn't allocate path variable "
+			  "in lsattr_dir_proc"));
+		return -1;
+	}

 	if (dir_len && dir_name[dir_len-1] == '/')
 		sprintf (path, "%s%s", dir_name, de->d_name);
--