From patchwork Mon May 24 15:25:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 448042 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 823B3C2B9F7 for ; Mon, 24 May 2021 15:46:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 64A5861990 for ; Mon, 24 May 2021 15:46:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232906AbhEXPru (ORCPT ); Mon, 24 May 2021 11:47:50 -0400 Received: from mail.kernel.org ([198.145.29.99]:33832 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233952AbhEXPpt (ORCPT ); Mon, 24 May 2021 11:45:49 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id CAF9C6145E; Mon, 24 May 2021 15:36:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621870593; bh=tp882o/zghF5p/HiL5a1X0yQiJpnlZs6BbLpzJElWZQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HAGK/XoiAzgt77OPA4wVNid5WgDQGtUp86QemYGpgkA/QL93OKkyrb9mAdPyfwvC+ xjLv53XdjZamqUwS3kUqpNuZAxVEJQu2grPid6ATdcEeQi/eu6VU85vnr2s34MSBnT mchvLe7atsu9S2KT8r0BGb1unajWVjtlH3hXU7/0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Aurelien Aptel , Ronnie Sahlberg , Steve French Subject: [PATCH 5.4 17/71] cifs: fix memory leak in smb2_copychunk_range Date: Mon, 24 May 2021 17:25:23 +0200 Message-Id: <20210524152327.021522694@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210524152326.447759938@linuxfoundation.org> References: <20210524152326.447759938@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Ronnie Sahlberg commit d201d7631ca170b038e7f8921120d05eec70d7c5 upstream. When using smb2_copychunk_range() for large ranges we will run through several iterations of a loop calling SMB2_ioctl() but never actually free the returned buffer except for the final iteration. This leads to memory leaks everytime a large copychunk is requested. Fixes: 9bf0c9cd4314 ("CIFS: Fix SMB2/SMB3 Copy offload support (refcopy) for large files") Cc: Reviewed-by: Aurelien Aptel Signed-off-by: Ronnie Sahlberg Signed-off-by: Steve French Signed-off-by: Greg Kroah-Hartman --- fs/cifs/smb2ops.c | 2 ++ 1 file changed, 2 insertions(+) --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -1673,6 +1673,8 @@ smb2_copychunk_range(const unsigned int cpu_to_le32(min_t(u32, len, tcon->max_bytes_chunk)); /* Request server copy to target from src identified by key */ + kfree(retbuf); + retbuf = NULL; rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid, trgtfile->fid.volatile_fid, FSCTL_SRV_COPYCHUNK_WRITE, true /* is_fsctl */, (char *)pcchunk,