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

Signed-off-by: Zhiqiang Liu <redacted>
Signed-off-by: Wu Guanghao <redacted>
Reviewed-by: Wu Bo <redacted>
---
 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);
 }

--