From: Yang Yingliang <yangyingliang@huawei.com>
Date: Sat, 25 Dec 2021 10:51:15 +0800
Subject: livepatch: Fix missing unlock on error in klp_enable_patch()
Git-commit: 50a0f3f55e382b313e7cbebdf8ccf1593296e16f
Patch-mainline: v5.16 or v5.16-rc9 (next release)
References: bsc#1071995

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

Acked-by: Miroslav Benes <mbenes@suse.cz>
---
 kernel/livepatch/core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index 7d228cdb44c5..585494ec464f 100644
--- 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);