From: Rafał Miłecki <rafal@milecki.pl>
Date: Sun, 9 Dec 2018 13:22:17 +0000 (+0100)
Subject: block: validate amount of arguments for the "autofs" command
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=30f509686d8abc2ffd7fe34401d00cf7a86d8ea9;p=project%2Ffstools.git

block: validate amount of arguments for the "autofs" command

Using argv[3] without checking argc value could result in undefined
behavior. It could result in a crash or accessing a NULL that separates
argv from envp on UNIX.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: John Crispin <john@phrozen.org>
---

diff --git a/block.c b/block.c
index 46050b4..a0bbf47 100644
--- a/block.c
+++ b/block.c
@@ -1157,6 +1157,10 @@ static int main_autofs(int argc, char **argv)
 		}
 		return 0;
 	}
+
+	if (argc < 4)
+		return -EINVAL;
+
 	return mount_action(argv[2], argv[3], TYPE_AUTOFS);
 }