From f1d48e52373301b0f579d3925734bc36655f5caa Mon Sep 17 00:00:00 2001
From: Tang Yizhou <tangyizhou@huawei.com>
Date: Sat, 30 Oct 2021 11:09:54 +0800
Subject: [PATCH] share_pool: Fix missing semaphore operation in error branch

ascend inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4EUVI
CVE: NA

-------------------------------------------------

Increase the value of sp_stat_sem when failed.

Signed-off-by: Tang Yizhou <tangyizhou@huawei.com>
Reviewed-by: Ding Tianhong <dingtianhong@huawei.com>
Reviewed-by: Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
 mm/share_pool.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/share_pool.c b/mm/share_pool.c
index ebc2d04c0114..607a5f0097a4 100644
--- a/mm/share_pool.c
+++ b/mm/share_pool.c
@@ -135,6 +135,7 @@ static struct sp_proc_stat *sp_init_proc_stat(struct task_struct *tsk,
 			up_write(&sp_stat_sem);
 			return stat;
 		} else {
+			up_write(&sp_stat_sem);
 			/* if enter this branch, that's our mistake */
 			pr_err_ratelimited("share pool: proc stat invalid id %d\n", id);
 			return ERR_PTR(-EBUSY);
-- 
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