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Tue, 24 Nov 2020 04:25:09 -0500 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-212-g3N8wqtRMZ6Wj3Ju68Q1jg-1; Tue, 24 Nov 2020 04:25:03 -0500 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 524238144EE; Tue, 24 Nov 2020 09:25:01 +0000 (UTC) Received: from f32-work.redhat.com (unknown [10.40.194.41]) by smtp.corp.redhat.com (Postfix) with ESMTPS id A981E60864; Tue, 24 Nov 2020 09:24:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1606209905; 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; bh=poLfg7L88RRtAgKXvx70cOjtVMZjq9ru030EzHdY378=; b=Y67kmFkAg/czyHLKsmYhi8AT4VQ4g8BQ9kYihZG39Uyo4e5vVM5xxtsjIR7zIo7r9v0aDG OjGDyTPl9+YtFcCXXjgsOiSs0FDw5Cy0wsY4PjSkbWgw7wujDyWWdgpyJKjGg+YIiE2ISh 2zPXv2Zia0eF4kaRJTm4lDmwEYrSn/g= X-MC-Unique: g3N8wqtRMZ6Wj3Ju68Q1jg-1 From: Mauro Matteo Cascella To: qemu-devel@nongnu.org Subject: [PATCH] hw/net/dp8393x: fix integer underflow in dp8393x_do_transmit_packets() Date: Tue, 24 Nov 2020 10:24:45 +0100 Message-Id: <20201124092445.658647-1-mcascell@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mcascell@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=63.128.21.124; envelope-from=mcascell@redhat.com; helo=us-smtp-delivery-124.mimecast.com 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: jasowang@redhat.com, pgn@zju.edu.cn, mcascell@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) Content-Type: text/plain; charset="utf-8" An integer underflow could occur during packet transmission due to 'tx_len'= not being updated if SONIC_TFC register is set to zero. Check for negative 'tx_= len' when removing existing FCS. RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=3D1899722 Signed-off-by: Mauro Matteo Cascella Reported-by: Gaoning Pan Acked-by: Jason Wang --- hw/net/dp8393x.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/hw/net/dp8393x.c b/hw/net/dp8393x.c index 674b04b354..205c0decc5 100644 --- a/hw/net/dp8393x.c +++ b/hw/net/dp8393x.c @@ -495,6 +495,10 @@ static void dp8393x_do_transmit_packets(dp8393xState *= s) } else { /* Remove existing FCS */ tx_len -=3D 4; + if (tx_len < 0) { + SONIC_ERROR("tx_len is %d\n", tx_len); + break; + } } =20 if (s->regs[SONIC_RCR] & (SONIC_RCR_LB1 | SONIC_RCR_LB0)) { --=20 2.28.0