From: Namjae Jeon <namjae.jeon@samsung.com>
Date: Tue, 30 Mar 2021 03:38:03 +0000 (+0900)
Subject: cifsd: fix wrong use of rw semaphore in __session_create()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=69f447be15130b57cc00fa0a5c2d3fa949a46165;p=linux.git

cifsd: fix wrong use of rw semaphore in __session_create()

Adding list to session table should be protected by
down_write/up_write().

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
---

diff --git a/fs/cifsd/mgmt/user_session.c b/fs/cifsd/mgmt/user_session.c
index afcdf76a3851c..1b71a20dacdb7 100644
--- a/fs/cifsd/mgmt/user_session.c
+++ b/fs/cifsd/mgmt/user_session.c
@@ -298,9 +298,9 @@ static struct ksmbd_session *__session_create(int protocol)
 		goto error;
 
 	if (protocol == CIFDS_SESSION_FLAG_SMB2) {
-		down_read(&sessions_table_lock);
+		down_write(&sessions_table_lock);
 		hash_add(sessions_table, &sess->hlist, sess->id);
-		up_read(&sessions_table_lock);
+		up_write(&sessions_table_lock);
 	}
 	return sess;