linux-ext4 - [PATCH 12/12] ext2ed: fix potential NULL pointer dereference in, dupstr()

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Message-ID: <f77ce978-86ed-7a25-abaa-4267592db28e@huawei.com>
Date:   Mon, 24 May 2021 19:26:36 +0800
From:   Wu Guanghao <wuguanghao3@...wei.com>
To:     <linux-ext4@...r.kernel.org>
CC:     <liuzhiqiang26@...wei.com>, <linfeilong@...wei.com>
Subject: [PATCH 12/12] ext2ed: fix potential NULL pointer dereference in,
 dupstr()

In dupstr(), we should check return value of malloc().

Signed-off-by: Zhiqiang Liu <liuzhiqiang26@...wei.com>
Signed-off-by: Wu Guanghao <wuguanghao3@...wei.com>
Reviewed-by: Wu Bo <wubo40@...wei.com>
---
 ext2ed/main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ext2ed/main.c b/ext2ed/main.c
index f7e7d7df..9d33a8e1 100644
--- a/ext2ed/main.c
+++ b/ext2ed/main.c
@@ -524,6 +524,8 @@ char *dupstr (char *src)
 	char *ptr;

 	ptr=(char *) malloc (strlen (src)+1);
+	if (!ptr)
+		return NULL;
 	strcpy (ptr,src);
 	return (ptr);
 }
--