From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 26AA346C54; Wed, 30 Jul 2025 17:18:26 +0200 (CEST) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id E1D16402E6; Wed, 30 Jul 2025 17:18:25 +0200 (CEST) Received: from inbox.dpdk.org (inbox.dpdk.org [95.142.172.178]) by mails.dpdk.org (Postfix) with ESMTP id BFC13402C3 for ; Wed, 30 Jul 2025 17:18:24 +0200 (CEST) Received: by inbox.dpdk.org (Postfix, from userid 33) id A4DFA46C55; Wed, 30 Jul 2025 17:18:24 +0200 (CEST) From: bugzilla@dpdk.org To: dev@dpdk.org Subject: [DPDK/core Bug 1761] rte_raw_cksum_mbuf obtain incorrect cksum when a packet in mbuf split mode. Date: Wed, 30 Jul 2025 15:18:23 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: DPDK X-Bugzilla-Component: core X-Bugzilla-Version: unspecified X-Bugzilla-Keywords: X-Bugzilla-Severity: critical X-Bugzilla-Who: yanglanping@bytedance.com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: Normal X-Bugzilla-Assigned-To: dev@dpdk.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter target_milestone Message-ID: Content-Type: multipart/alternative; boundary=17538887040.0CCA229.508620 Content-Transfer-Encoding: 7bit X-Bugzilla-URL: https://bugs.dpdk.org/ Auto-Submitted: auto-generated X-Auto-Response-Suppress: All MIME-Version: 1.0 X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org --17538887040.0CCA229.508620 Date: Wed, 30 Jul 2025 17:18:24 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.dpdk.org/ Auto-Submitted: auto-generated X-Auto-Response-Suppress: All https://bugs.dpdk.org/show_bug.cgi?id=3D1761 Bug ID: 1761 Summary: rte_raw_cksum_mbuf obtain incorrect cksum when a packet in mbuf split mode. Product: DPDK Version: unspecified Hardware: All OS: Linux Status: UNCONFIRMED Severity: critical Priority: Normal Component: core Assignee: dev@dpdk.org Reporter: yanglanping@bytedance.com Target Milestone: --- Hi. This issue is about calc cksum, in rte_raw_cksum_mbuf function, when the pa= cket data is stored in multiple mbufs, below code easy overflow. File rte_cksum.h line 159: if (done & 1) line 160: tmp =3D rte_bswap16((uint16_t)tmp);=20 line 161: sum +=3D tmp; The tmp(uint32_t) variable can easily be greater than 0xFFFF, so (uint16_t)= tmp will discard the high 16bit, cause incorrect result. --=20 You are receiving this mail because: You are the assignee for the bug.= --17538887040.0CCA229.508620 Date: Wed, 30 Jul 2025 17:18:24 +0200 MIME-Version: 1.0 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.dpdk.org/ Auto-Submitted: auto-generated X-Auto-Response-Suppress: All
Bug ID 1761
Summary rte_raw_cksum_mbuf obtain incorrect cksum when a packet in mb= uf split mode.
Product DPDK
Version unspecified
Hardware All
OS Linux
Status UNCONFIRMED
Severity critical
Priority Normal
Component core
Assignee dev@dpdk.org
Reporter yanglanping@bytedance.com
Target Milestone --- 

Hi.

This issue is about calc cksum, in rte_raw_cksum_mbuf function, when the pa=
cket
data is stored in multiple mbufs, below code easy overflow.

File rte_cksum.h
    line 159: if (done & 1)
    line 160:     tmp =3D rte_bswap16((uint16_t)tmp);=20
    line 161: sum +=3D tmp;

The tmp(uint32_t) variable can easily be greater than 0xFFFF, so (uint16_t)=
tmp
will discard the high 16bit, cause incorrect result.

You are receiving this mail because:
  • You are the assignee for the bug.
=20=20=20=20=20=20=20=20=20=20
= --17538887040.0CCA229.508620--