From: Namjae Jeon <linkinjeon@kernel.org>
Date: Wed, 27 Dec 2023 10:26:04 +0000 (+0900)
Subject: ksmbd: avoid duplicate opinfo_put() call on error of smb21_lease_break_ack()
X-Git-Tag: v5.15.146~24
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=06208a04a7bd6ac3a359de2fa047e71f474f24b9;p=thirdparty%2Fkernel%2Fstable.git

ksmbd: avoid duplicate opinfo_put() call on error of smb21_lease_break_ack()

[ Upstream commit 658609d9a618d8881bf549b5893c0ba8fcff4526 ]

opinfo_put() could be called twice on error of smb21_lease_break_ack().
It will cause UAF issue if opinfo is referenced on other places.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index c1dde42043662..e1c640ed7acc3 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -8221,6 +8221,11 @@ static void smb21_lease_break_ack(struct ksmbd_work *work)
 			    le32_to_cpu(req->LeaseState));
 	}
 
+	if (ret < 0) {
+		rsp->hdr.Status = err;
+		goto err_out;
+	}
+
 	lease_state = lease->state;
 	opinfo->op_state = OPLOCK_STATE_NONE;
 	wake_up_interruptible_all(&opinfo->oplock_q);
@@ -8228,11 +8233,6 @@ static void smb21_lease_break_ack(struct ksmbd_work *work)
 	wake_up_interruptible_all(&opinfo->oplock_brk);
 	opinfo_put(opinfo);
 
-	if (ret < 0) {
-		rsp->hdr.Status = err;
-		goto err_out;
-	}
-
 	rsp->StructureSize = cpu_to_le16(36);
 	rsp->Reserved = 0;
 	rsp->Flags = 0;