[PATCH 4.19 187/338] lib/test: use after free in register_test_dev_kmod()

[Greg Kroah-Hartman]

From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

[ Upstream commit dc0ce6cc4b133f5f2beb8b47dacae13a7d283c2c ]

The "test_dev" pointer is freed but then returned to the caller.

Fixes: d9c6a72d6fa2 ("kmod: add test driver to stress test the module loader")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 lib/test_kmod.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/test_kmod.c b/lib/test_kmod.c
index 87a0cc750ea2..6813b183aa34 100644
--- a/lib/test_kmod.c
+++ b/lib/test_kmod.c
@@ -1155,6 +1155,7 @@ static struct kmod_test_device *register_test_dev_kmod(void)
 	if (ret) {
 		pr_err("could not register misc device: %d\n", ret);
 		free_test_dev_kmod(test_dev);
+		test_dev = NULL;
 		goto out;
 	}
 
-- 
2.34.1