From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Fri, 1 Feb 2019 22:20:58 +0000 (-0800)
Subject: lib/test_kmod.c: potential double free in error handling
X-Git-Tag: v4.19.29~92
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f1524fd049dec225ca8ae5585fced14359f348e6;p=platform%2Fkernel%2Flinux-rpi.git

lib/test_kmod.c: potential double free in error handling

[ Upstream commit db7ddeab3ce5d64c9696e70d61f45ea9909cd196 ]

There is a copy and paste bug so we set "config->test_driver" to NULL
twice instead of setting "config->test_fs".  Smatch complains that it
leads to a double free:

  lib/test_kmod.c:840 __kmod_config_init() warn: 'config->test_fs' double freed

Link: http://lkml.kernel.org/r/20190121140011.GA14283@kadam
Fixes: d9c6a72d6fa2 ("kmod: add test driver to stress test the module loader")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/lib/test_kmod.c b/lib/test_kmod.c
index d82d022..9cf7762 100644
--- a/lib/test_kmod.c
+++ b/lib/test_kmod.c
@@ -632,7 +632,7 @@ static void __kmod_config_free(struct test_config *config)
 	config->test_driver = NULL;
 
 	kfree_const(config->test_fs);
-	config->test_driver = NULL;
+	config->test_fs = NULL;
 }
 
 static void kmod_config_free(struct kmod_test_device *test_dev)