From c69813471a1ec081a0b9bf0c6bd7e8afd818afce Mon Sep 17 00:00:00 2001
From: luosili <rootlab@huawei.com>
Date: Wed, 4 Oct 2023 18:29:36 +0900
Subject: [PATCH] ksmbd: fix uaf in smb20_oplock_break_ack

drop reference after use opinfo.

Signed-off-by: luosili <rootlab@huawei.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
---
 fs/smb/server/smb2pdu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c
index 420e7691c8cf..b9d6e8e451ba 100644
--- a/fs/smb/server/smb2pdu.c
+++ b/fs/smb/server/smb2pdu.c
@@ -8038,10 +8038,10 @@ static void smb20_oplock_break_ack(struct ksmbd_work *work)
 		goto err_out;
 	}
 
-	opinfo_put(opinfo);
-	ksmbd_fd_put(work, fp);
 	opinfo->op_state = OPLOCK_STATE_NONE;
 	wake_up_interruptible_all(&opinfo->oplock_q);
+	opinfo_put(opinfo);
+	ksmbd_fd_put(work, fp);
 
 	rsp->StructureSize = cpu_to_le16(24);
 	rsp->OplockLevel = rsp_oplevel;