Patch "lib/test: use after free in register_test_dev_kmod()" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    lib/test: use after free in register_test_dev_kmod()

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     lib-test-use-after-free-in-register_test_dev_kmod.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit c144bde0fc60847f9dd24cc621f13f3ca989940e
Author: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date:   Thu Mar 24 08:52:07 2022 +0300

    lib/test: use after free in register_test_dev_kmod()
    
    [ 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>

diff --git a/lib/test_kmod.c b/lib/test_kmod.c
index ce1589391413..cb800b1d0d99 100644
--- a/lib/test_kmod.c
+++ b/lib/test_kmod.c
@@ -1149,6 +1149,7 @@ 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;
 	}