livepatch: Fix missing unlock on error in klp_enable_patch()

Add missing unlock when try_module_get() fails in klp_enable_patch().

Fixes: 5ef3dd20555e8e8 ("livepatch: Fix kobject refcount bug on klp_init_patch_early failure path")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Acked-by: David Vernet <void@manifault.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20211225025115.475348-1-yangyingliang@huawei.com

diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index 7d228cd..585494e 100644 (file)
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -1047,8 +1047,10 @@ int klp_enable_patch(struct klp_patch *patch)
                return -EINVAL;
        }
 
-       if (!try_module_get(patch->mod))
+       if (!try_module_get(patch->mod)) {
+               mutex_unlock(&klp_mutex);
                return -ENODEV;
+       }
 
        klp_init_patch_early(patch);