From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 46F4B1DE4C6; Wed, 19 Mar 2025 14:36:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742394962; cv=none; b=SC3rKzbHOs/r83ChQIqNmWuH01LsLU7zwBQpyyt13LUKv2HMNkLhXYG+SxevpotfGErpZpiZbHLSP9729CKBNw8VSn3PJ7K2XZ85ljlqyc02uJUgTI5SslaEXtSnYkiReUM7Ea/ZCAknZ08TLCbuj3Mj+3iS2GEaLVI1Zs3XO+E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742394962; c=relaxed/simple; bh=UZMAnwIn1E7x4NbidLbKeOndymcJVqk6FKkWQYy2Tuo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Q4aY7710kywbIpI8r01xPjQRQC9E54u7AmDakpAjkWJFtbeTM44fWQj4yKcJIbeXh89cVB0kSgoQGzf2iBa9vNShPXgC66gTz2OyjZO8CdqG+IxEOhVSqnLy4ceD/xaGv3OB74p4GkeJ0u57WqTzIuWiHf7uNbGWzPPLXoMNgVo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=U11rl8d8; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="U11rl8d8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1C411C4CEE4; Wed, 19 Mar 2025 14:36:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1742394962; bh=UZMAnwIn1E7x4NbidLbKeOndymcJVqk6FKkWQYy2Tuo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=U11rl8d8W7JMPBRlndTxvRDwQcWL9clLFiX6x6e6lGnLtLEuTLJAj9AlQvh0AJukg jHS6rAFVeEEPW+Ro7aHXo3uc1zECRiomw2I4W7hLPykZk1lGOxE35RArNjOffRKfb2 kj8lH0OBsW4X0de9XjOTIoM931iz/4OJCAsdTcDg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Norbert Szetei , Namjae Jeon , Steve French Subject: [PATCH 6.13 190/241] ksmbd: prevent connection release during oplock break notification Date: Wed, 19 Mar 2025 07:31:00 -0700 Message-ID: <20250319143032.422722058@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250319143027.685727358@linuxfoundation.org> References: <20250319143027.685727358@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.13-stable review patch. If anyone has any objections, please let me know. ------------------ From: Namjae Jeon commit 3aa660c059240e0c795217182cf7df32909dd917 upstream. ksmbd_work could be freed when after connection release. Increment r_count of ksmbd_conn to indicate that requests are not finished yet and to not release the connection. Cc: stable@vger.kernel.org Reported-by: Norbert Szetei Tested-by: Norbert Szetei Signed-off-by: Namjae Jeon Signed-off-by: Steve French Signed-off-by: Greg Kroah-Hartman --- fs/smb/server/connection.c | 20 ++++++++++++++++++++ fs/smb/server/connection.h | 2 ++ fs/smb/server/oplock.c | 6 ++++++ fs/smb/server/server.c | 14 ++------------ 4 files changed, 30 insertions(+), 12 deletions(-) --- a/fs/smb/server/connection.c +++ b/fs/smb/server/connection.c @@ -433,6 +433,26 @@ void ksmbd_conn_init_server_callbacks(st default_conn_ops.terminate_fn = ops->terminate_fn; } +void ksmbd_conn_r_count_inc(struct ksmbd_conn *conn) +{ + atomic_inc(&conn->r_count); +} + +void ksmbd_conn_r_count_dec(struct ksmbd_conn *conn) +{ + /* + * Checking waitqueue to dropping pending requests on + * disconnection. waitqueue_active is safe because it + * uses atomic operation for condition. + */ + atomic_inc(&conn->refcnt); + if (!atomic_dec_return(&conn->r_count) && waitqueue_active(&conn->r_count_q)) + wake_up(&conn->r_count_q); + + if (atomic_dec_and_test(&conn->refcnt)) + kfree(conn); +} + int ksmbd_conn_transport_init(void) { int ret; --- a/fs/smb/server/connection.h +++ b/fs/smb/server/connection.h @@ -168,6 +168,8 @@ int ksmbd_conn_transport_init(void); void ksmbd_conn_transport_destroy(void); void ksmbd_conn_lock(struct ksmbd_conn *conn); void ksmbd_conn_unlock(struct ksmbd_conn *conn); +void ksmbd_conn_r_count_inc(struct ksmbd_conn *conn); +void ksmbd_conn_r_count_dec(struct ksmbd_conn *conn); /* * WARNING --- a/fs/smb/server/oplock.c +++ b/fs/smb/server/oplock.c @@ -634,6 +634,7 @@ static void __smb2_oplock_break_noti(str { struct smb2_oplock_break *rsp = NULL; struct ksmbd_work *work = container_of(wk, struct ksmbd_work, work); + struct ksmbd_conn *conn = work->conn; struct oplock_break_info *br_info = work->request_buf; struct smb2_hdr *rsp_hdr; struct ksmbd_file *fp; @@ -689,6 +690,7 @@ static void __smb2_oplock_break_noti(str out: ksmbd_free_work_struct(work); + ksmbd_conn_r_count_dec(conn); } /** @@ -723,6 +725,7 @@ static int smb2_oplock_break_noti(struct work->sess = opinfo->sess; if (opinfo->op_state == OPLOCK_ACK_WAIT) { + ksmbd_conn_r_count_inc(conn); INIT_WORK(&work->work, __smb2_oplock_break_noti); ksmbd_queue_work(work); @@ -744,6 +747,7 @@ static void __smb2_lease_break_noti(stru { struct smb2_lease_break *rsp = NULL; struct ksmbd_work *work = container_of(wk, struct ksmbd_work, work); + struct ksmbd_conn *conn = work->conn; struct lease_break_info *br_info = work->request_buf; struct smb2_hdr *rsp_hdr; @@ -790,6 +794,7 @@ static void __smb2_lease_break_noti(stru out: ksmbd_free_work_struct(work); + ksmbd_conn_r_count_dec(conn); } /** @@ -829,6 +834,7 @@ static int smb2_lease_break_noti(struct work->sess = opinfo->sess; if (opinfo->op_state == OPLOCK_ACK_WAIT) { + ksmbd_conn_r_count_inc(conn); INIT_WORK(&work->work, __smb2_lease_break_noti); ksmbd_queue_work(work); wait_for_break_ack(opinfo); --- a/fs/smb/server/server.c +++ b/fs/smb/server/server.c @@ -270,17 +270,7 @@ static void handle_ksmbd_work(struct wor ksmbd_conn_try_dequeue_request(work); ksmbd_free_work_struct(work); - /* - * Checking waitqueue to dropping pending requests on - * disconnection. waitqueue_active is safe because it - * uses atomic operation for condition. - */ - atomic_inc(&conn->refcnt); - if (!atomic_dec_return(&conn->r_count) && waitqueue_active(&conn->r_count_q)) - wake_up(&conn->r_count_q); - - if (atomic_dec_and_test(&conn->refcnt)) - kfree(conn); + ksmbd_conn_r_count_dec(conn); } /** @@ -310,7 +300,7 @@ static int queue_ksmbd_work(struct ksmbd conn->request_buf = NULL; ksmbd_conn_enqueue_request(work); - atomic_inc(&conn->r_count); + ksmbd_conn_r_count_inc(conn); /* update activity on connection */ conn->last_active = jiffies; INIT_WORK(&work->work, handle_ksmbd_work);