From mboxrd@z Thu Jan 1 00:00:00 1970 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=unavailable 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 82E4EC4709E for ; Mon, 24 May 2021 16:04:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 65ED3613CB for ; Mon, 24 May 2021 16:04:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236586AbhEXQEb (ORCPT ); Mon, 24 May 2021 12:04:31 -0400 Received: from mail.kernel.org ([198.145.29.99]:40476 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232548AbhEXP5z (ORCPT ); Mon, 24 May 2021 11:57:55 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id B51C46195E; Mon, 24 May 2021 15:43:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621871029; bh=bChgj2DjxmvGeQFc/40vVgbfRS/th9c56r8IUMxtNjs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tmCivFImF8AKeJgjH0W4kJEPvWdBBwM01LIi417XuHvk8uLuOZsI+ne/s4f+Yde4d IgjAaxRmDvOzrkXJBdecE1o1vac/uQ9fUJzIHg0cFET96KJLcDv9WBSDPrk8f+xAfD wNCMKZy+4qoqVOI0wC5lgB7XFFbAZZsLNAmhtBAg= 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 5.12 039/127] cifs: fix memory leak in smb2_copychunk_range Date: Mon, 24 May 2021 17:25:56 +0200 Message-Id: <20210524152336.172737530@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210524152334.857620285@linuxfoundation.org> References: <20210524152334.857620285@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 @@ -1822,6 +1822,8 @@ 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,