linux-kernel - [PATCH] ksmbd: fix possible refcount leak in smb2

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Message-ID: <20230302135804.2583061-1-chenxiaosong2@huawei.com>
Date:   Thu, 2 Mar 2023 21:58:04 +0800
From:   ChenXiaoSong <chenxiaosong2@...wei.com>
To:     <linkinjeon@...nel.org>, <sfrench@...ba.org>,
        <senozhatsky@...omium.org>, <lsahlber@...hat.com>,
        <hyc.lee@...il.com>
CC:     <linux-cifs@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <chenxiaosong2@...wei.com>, <yi.zhang@...wei.com>,
        <zhangxiaoxu5@...wei.com>, <yanaijie@...wei.com>
Subject: [PATCH] ksmbd: fix possible refcount leak in smb2_open()

Reference count of acls will leak when memory allocation fails. Fix this
by adding the missing posix_acl_release().

Fixes: e2f34481b24d ("cifsd: add server-side procedures for SMB3")
Signed-off-by: ChenXiaoSong <chenxiaosong2@...wei.com>
---
 fs/ksmbd/smb2pdu.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 0685c1c77b9f..f04d810a2588 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -2977,8 +2977,11 @@ int smb2_open(struct ksmbd_work *work)
 							sizeof(struct smb_acl) +
 							sizeof(struct smb_ace) * ace_num * 2,
 							GFP_KERNEL);
-					if (!pntsd)
+					if (!pntsd) {
+						posix_acl_release(fattr.cf_acls);
+						posix_acl_release(fattr.cf_dacls);
 						goto err_out;
+					}
 
 					rc = build_sec_desc(idmap,
 							    pntsd, NULL, 0,
-- 
2.31.1