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=-6.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 9308FC433E7 for ; Thu, 15 Oct 2020 16:59:51 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E14B6206CA for ; Thu, 15 Oct 2020 16:59:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Hw67hl7F" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E14B6206CA Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:54002 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kT6bV-0002uF-T6 for qemu-devel@archiver.kernel.org; Thu, 15 Oct 2020 12:59:49 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:44182) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kT6UM-0001wF-87 for qemu-devel@nongnu.org; Thu, 15 Oct 2020 12:52:26 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:31457) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kT6UH-0001Pw-4n for qemu-devel@nongnu.org; Thu, 15 Oct 2020 12:52:25 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1602780740; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=llH9wrjtFOuz0FCeC+jMKaYbRHVJSqilfUFVhFHCtIA=; b=Hw67hl7F7HYnMURYdV93aQjTdbljraB16RpOMEkTGnwZjIhHsR+NP+bMAnIXIddjWdDPuf dqNtrJhoZxdY413eOoqN5v/KukVZEO0uHnpOGgx33nFIhsbc4mJB3PwXkzgOVn7FcbMvtE HRoP+JsOwQW0cYPvH/faICb5TUyD/Ls= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-193-6F4s-AQWOnON02Y09pyRzA-1; Thu, 15 Oct 2020 12:52:18 -0400 X-MC-Unique: 6F4s-AQWOnON02Y09pyRzA-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 4A37480363A; Thu, 15 Oct 2020 16:52:17 +0000 (UTC) Received: from localhost (ovpn-66-44.rdu2.redhat.com [10.10.66.44]) by smtp.corp.redhat.com (Postfix) with ESMTP id 143E860E1C; Thu, 15 Oct 2020 16:52:16 +0000 (UTC) Date: Thu, 15 Oct 2020 12:52:15 -0400 From: Eduardo Habkost To: Ani Sinha Subject: Re: [PATCH v3] qom: code hardening - have bound checking while looping with integer value Message-ID: <20201015165215.GE5733@habkost.net> References: <20200921093325.25617-1-ani@anisinha.ca> MIME-Version: 1.0 In-Reply-To: <20200921093325.25617-1-ani@anisinha.ca> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=ehabkost@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=216.205.24.124; envelope-from=ehabkost@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/15 02:38:26 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Mon, Sep 21, 2020 at 03:03:25PM +0530, Ani Sinha wrote: > Object property insertion code iterates over an integer to get an unused > index that can be used as an unique name for an object property. This loop > increments the integer value indefinitely. Although very unlikely, this can > still cause an integer overflow. > In this change, we fix the above code by checking against INT16_MAX and making > sure that the interger index does not overflow beyond that value. If no > available index is found, the code would cause an assertion failure. This > assertion failure is necessary because the callers of the function do not check > the return value for NULL. > > Signed-off-by: Ani Sinha > Reviewed-by: Daniel P. Berrangé Queued on machine-next, thanks! My apologies for the delay. -- Eduardo