linux-ext4 - [PATCH v3 11/12] misc/lsattr: check whether path is NULL in lsattr_dir

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Date:   Wed, 28 Jul 2021 09:56:48 +0800
From:   wuguanghao <wuguanghao3@...wei.com>
To:     <linux-ext4@...r.kernel.org>, <tytso@....edu>
CC:     <linfeilong@...wei.com>, <liuzhiqiang26@...wei.com>,
        <wuguanghao3@...wei.com>
Subject: [PATCH v3 11/12] misc/lsattr: check whether path is NULL in lsattr_dir_proc()

From: Zhiqiang Liu <liuzhiqiang26@...wei.com>

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 | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/misc/lsattr.c b/misc/lsattr.c
index 0d954376..7958f0ad 100644
--- a/misc/lsattr.c
+++ b/misc/lsattr.c
@@ -144,6 +144,11 @@ 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) {
+		fputs(_("Couldn't allocate path variable in lsattr_dir_proc"),
+			stderr);
+		return -1;
+	}
 
 	if (dir_len && dir_name[dir_len-1] == '/')
 		sprintf (path, "%s%s", dir_name, de->d_name);
-- 
2.27.0