linux-kernel - [PATCH AUTOSEL 6.1 23/26] ksmbd: Fix resource leak in smb2

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Message-Id: <20221224012930.392358-23-sashal@kernel.org>
Date:   Fri, 23 Dec 2022 20:29:27 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Marios Makassikis <mmakassikis@...ebox.fr>,
        Namjae Jeon <linkinjeon@...nel.org>,
        Steve French <stfrench@...rosoft.com>,
        Sasha Levin <sashal@...nel.org>, sfrench@...ba.org,
        linux-cifs@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 23/26] ksmbd: Fix resource leak in smb2_lock()

From: Marios Makassikis <mmakassikis@...ebox.fr>

[ Upstream commit 01f6c61bae3d658058ee6322af77acea26a5ee3a ]

"flock" is leaked if an error happens before smb2_lock_init(), as the
lock is not added to the lock_list to be cleaned up.

Signed-off-by: Marios Makassikis <mmakassikis@...ebox.fr>
Acked-by: Namjae Jeon <linkinjeon@...nel.org>
Signed-off-by: Steve French <stfrench@...rosoft.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/ksmbd/smb2pdu.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index b2fc85d440d0..58da085413a6 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -6855,6 +6855,7 @@ int smb2_lock(struct ksmbd_work *work)
 		if (lock_start > U64_MAX - lock_length) {
 			pr_err("Invalid lock range requested\n");
 			rsp->hdr.Status = STATUS_INVALID_LOCK_RANGE;
+			locks_free_lock(flock);
 			goto out;
 		}
 
@@ -6874,6 +6875,7 @@ int smb2_lock(struct ksmbd_work *work)
 				    "the end offset(%llx) is smaller than the start offset(%llx)\n",
 				    flock->fl_end, flock->fl_start);
 			rsp->hdr.Status = STATUS_INVALID_LOCK_RANGE;
+			locks_free_lock(flock);
 			goto out;
 		}
 
@@ -6885,6 +6887,7 @@ int smb2_lock(struct ksmbd_work *work)
 				    flock->fl_type != F_UNLCK) {
 					pr_err("conflict two locks in one request\n");
 					err = -EINVAL;
+					locks_free_lock(flock);
 					goto out;
 				}
 			}
@@ -6893,6 +6896,7 @@ int smb2_lock(struct ksmbd_work *work)
 		smb_lock = smb2_lock_init(flock, cmd, flags, &lock_list);
 		if (!smb_lock) {
 			err = -EINVAL;
+			locks_free_lock(flock);
 			goto out;
 		}
 	}
-- 
2.35.1