From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out198-12.us.a.mail.aliyun.com (out198-12.us.a.mail.aliyun.com [47.90.198.12]) (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 B1F28379C42; Wed, 9 Sep 2026 17:36:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=47.90.198.12 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788975420; cv=none; b=Ake0YTPe1U4van96lMOTmv87m0qswtXOoPoc/sHupst9xRVrFtVUmBYb+tzUyJ2Cpbk69ZTUxmphWU4s/zkMmcbBGjYhL76VmYpw9kpK+AJePreH3adFigtfIP1FfMe7ZLoul72MqcIIVl27IQqB6W8XsUdUyYMtLIZX6eXjz+8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788975420; c=relaxed/simple; bh=5Lm49B6zVwyaOVGoSVRUBFwcAtXY6GIRbIOPfFalVKc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=E6JkenICRotEbmt3bHLKMesy/DCnYdWnkJqr6yFvDL5Px6898R1CpLbERipV8Oh8w6IaZWnwBu7MIB6xHXmtJ9TB1eEokeVI7BVBpHeZH7wYHrcF5dc+bVoSzd7hqbj6IAmsBuF4OUhcIEeoPyx1GyLIOZtMHzqeV+ueu/1Hwk4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=xiaopeng.com; spf=pass smtp.mailfrom=xiaopeng.com; dkim=pass (1024-bit key) header.d=xiaopeng.com header.i=@xiaopeng.com header.b=jqd5bT9v; arc=none smtp.client-ip=47.90.198.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=xiaopeng.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=xiaopeng.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=xiaopeng.com header.i=@xiaopeng.com header.b="jqd5bT9v" DKIM-Signature:v=1; a=rsa-sha256; c=relaxed/relaxed; d=xiaopeng.com; s=default; t=1788975398; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=IqWNJurljz2sEYQNlRb5yGZBxJR2ATuvv3gT2h+LMz8=; b=jqd5bT9vPAsUQou7K569Px2/bWNzna8gXQJTXMuFFTVDLGQSoy7SW0iBVbr+d3N0zDsXa4AhiWG8XQ6p/Hm0R1+wL7bRaBNqpk5Rc892RD2Nz5NyGPUxIZOlrfJmXvDHcfl+0/ZsVEQdZgh8b7fuUCDZJyYtq9TQNrifCWTDWLo= X-Alimail-AntiSpam:AC=CONTINUE;BC=0.07438226|-1;CH=green;DM=|CONTINUE|false|;DS=CONTINUE|ham_alarm|0.0952803-0.00463008-0.90009;FP=14473300978445122994|0|0|0|0|-1|-1|-1;HT=maildocker-contentspam033037026024;MF=liuc63@xiaopeng.com;NM=1;PH=DS;RN=10;RT=10;SR=0;TI=SMTPD_---.j9p79vc_1788975072; Received: from localhost(mailfrom:liuc63@xiaopeng.com fp:SMTPD_---.j9p79vc_1788975072 cluster:ay29) by smtp.aliyun-inc.com; Thu, 10 Sep 2026 01:31:15 +0800 From: Liu Chao To: Robin van der Gracht , Oleksij Rempel , Oliver Hartkopp , Marc Kleine-Budde Cc: kernel@pengutronix.de, linux-can@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Liu Chao Subject: [PATCH net v2 2/2] can: j1939: check received packet count before completing session Date: Thu, 10 Sep 2026 01:31:04 +0800 Message-ID: <20260909173105.158202-3-liuc63@xiaopeng.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20260909173105.158202-1-liuc63@xiaopeng.com> References: <20260909173105.158202-1-liuc63@xiaopeng.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit j1939_xtp_rx_eoma_one() marks a session complete as soon as it sees an EOMA without verifying that all data packets arrived. Add a pkt.rx check so a session with missing packets gets aborted instead of delivering a short message to userspace. Also tighten the existing EOMA size-mismatch warning to actually abort for receive sessions instead of just logging. The warning itself is kept for both rx and tx paths so transmitter-side protocol violations are still logged. Only unicast receive sessions are gated: - Transmitter sessions track pkt.rx via loopback confirmations which may legitimately lag behind the real transmit count, so the check would cause false aborts on the tx path. - BAM (broadcast) sessions never go through EOMA -- they complete via the final flag in j1939_xtp_rx_dat_one() when pkt.rx reaches pkt.total directly. The error path skips sessions already in J1939_SESSION_WAITING_ABORT: cancelling the deactivation timer there would leave the session on active_session_list forever, since j1939_session_cancel() only re-arms that timer for sessions which are not yet aborting. The same failure mode was previously fixed for the second-RTS path by 1809c82aa073 ("net: can: j1939: j1939_xtp_rx_rts_session_active(): deactivate session upon receiving the second rts"). Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Cc: stable@vger.kernel.org Signed-off-by: Liu Chao --- net/can/j1939/transport.c | 26 +++++++++++++++++++++++++- 1 file changed, 25 insertions(+), 1 deletion(-) diff --git a/net/can/j1939/transport.c b/net/can/j1939/transport.c index c40db4337..fe447077b 100644 --- a/net/can/j1939/transport.c +++ b/net/can/j1939/transport.c @@ -1396,6 +1396,7 @@ static void j1939_xtp_rx_eoma_one(struct j1939_session *session, struct sk_buff *skb) { struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); + unsigned int expected_total; const u8 *dat; int len; @@ -1411,9 +1412,22 @@ j1939_xtp_rx_eoma_one(struct j1939_session *session, struct sk_buff *skb) if (session->total_message_size != len) { netdev_warn_once(session->priv->ndev, - "%s: 0x%p: Incorrect size. Expected: %i; got: %i.\n", + "%s: 0x%p: EOMA size mismatch, expected %u got %d\n", __func__, session, session->total_message_size, len); + if (!session->transmission) + goto out_session_cancel; + } + + if (!session->transmission) { + expected_total = (session->total_message_size + 6) / 7; + if (session->pkt.rx < expected_total) { + netdev_warn_once(session->priv->ndev, + "%s: 0x%p: EOMA but only %u/%u data packets rx'd\n", + __func__, session, + session->pkt.rx, expected_total); + goto out_session_cancel; + } } netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session); @@ -1422,6 +1436,16 @@ j1939_xtp_rx_eoma_one(struct j1939_session *session, struct sk_buff *skb) j1939_session_timers_cancel(session); /* transmitted without problems */ j1939_session_completed(session); + return; + + out_session_cancel: + /* Don't touch timers if the session is already aborting; + * cancelling the deactivation timer here would leak the session. + */ + if (session->state >= J1939_SESSION_WAITING_ABORT) + return; + j1939_session_timers_cancel(session); + j1939_session_cancel(session, J1939_XTP_ABORT_FAULT); } static void -- 2.50.1