[PATCH v3 4/4] test_kmod: Avoid potential double free in trigger_config_run_type()

From: Tiezhu Yang
Date: Mon Apr 20 2020 - 08:34:12 EST


Reset the member "test_fs" of the test configuration after a call
of the function "kfree_const" to a null pointer so that a double
memory release will not be performed.

Fixes: d9c6a72d6fa2 ("kmod: add test driver to stress test the module loader")
Acked-by: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Signed-off-by: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
---

v3:
- use the quotes with correct format in the commit message,
sorry for that

v2:
- update the commit message suggested by Markus Elfring
- add the Fixes tag

lib/test_kmod.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/test_kmod.c b/lib/test_kmod.c
index e651c37..eab5277 100644
--- a/lib/test_kmod.c
+++ b/lib/test_kmod.c
@@ -745,7 +745,7 @@ static int trigger_config_run_type(struct kmod_test_device *test_dev,
break;
case TEST_KMOD_FS_TYPE:
kfree_const(config->test_fs);
- config->test_driver = NULL;
+ config->test_fs = NULL;
copied = config_copy_test_fs(config, test_str,
strlen(test_str));
break;
--
2.1.0