[PATCH] selftests/livepatch: fix resource leak in test_klp_syscall init error path

[Rui Qi]

In livepatch_init(), if klp_enable_patch() fails, the previously
created kobject and sysfs file are never cleaned up, causing a
resource leak. Capture the return value and add proper cleanup
on the error path.

Signed-off-by: Rui Qi <qirui....@bytedance.com>
---
 .../selftests/livepatch/test_modules/test_klp_syscall.c    | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/livepatch/test_modules/test_klp_syscall.c 
b/tools/testing/selftests/livepatch/test_modules/test_klp_syscall.c
index 0630ffd9d9a1..d631acae48b9 100644
--- a/tools/testing/selftests/livepatch/test_modules/test_klp_syscall.c
+++ b/tools/testing/selftests/livepatch/test_modules/test_klp_syscall.c
@@ -109,7 +109,12 @@ static int livepatch_init(void)
         */
        npids = npids_pending;
 
-       return klp_enable_patch(&patch);
+       ret = klp_enable_patch(&patch);
+       if (ret) {
+               sysfs_remove_file(klp_kobj, &klp_attr.attr);
+               kobject_put(klp_kobj);
+       }
+       return ret;
 }
 
 static void livepatch_exit(void)
-- 
2.20.1