From patchwork Mon Nov 30 10:56:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 11940193 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=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 23CBCC64E8A for ; Mon, 30 Nov 2020 11:05:13 +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 60EAB207F7 for ; Mon, 30 Nov 2020 11:05:12 +0000 (UTC) Authentication-Results: mail.kernel.org; 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Mon, 30 Nov 2020 10:57:10 +0000 (UTC) Received: from merkur.fritz.box (ovpn-114-117.ams2.redhat.com [10.36.114.117]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5A30563BA7; Mon, 30 Nov 2020 10:57:09 +0000 (UTC) From: Kevin Wolf To: qemu-devel@nongnu.org Subject: [PATCH 4/4] can-host: Fix crash when 'canbus' property is not set Date: Mon, 30 Nov 2020 11:56:15 +0100 Message-Id: <20201130105615.21799-5-kwolf@redhat.com> In-Reply-To: <20201130105615.21799-1-kwolf@redhat.com> References: <20201130105615.21799-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=kwolf@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=63.128.21.124; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -35 X-Spam_score: -3.6 X-Spam_bar: --- X-Spam_report: (-3.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.496, 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=-0.01, RCVD_IN_MSPIKE_WL=-0.01, 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: kwolf@redhat.com, jasowang@redhat.com, fnu.vikram@xilinx.com, berrange@redhat.com, pisa@cmp.felk.cvut.cz Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Providing the 'if' property, but not 'canbus' segfaults like this: #0 0x0000555555b0f14d in can_bus_insert_client (bus=0x0, client=0x555556aa9af0) at ../net/can/can_core.c:88 #1 0x00005555559c3803 in can_host_connect (ch=0x555556aa9ac0, errp=0x7fffffffd568) at ../net/can/can_host.c:62 #2 0x00005555559c386a in can_host_complete (uc=0x555556aa9ac0, errp=0x7fffffffd568) at ../net/can/can_host.c:72 #3 0x0000555555d52de9 in user_creatable_complete (uc=0x555556aa9ac0, errp=0x7fffffffd5c8) at ../qom/object_interfaces.c:23 Add the missing NULL check. Signed-off-by: Kevin Wolf --- net/can/can_host.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/net/can/can_host.c b/net/can/can_host.c index be4547d913..ba7f163d0a 100644 --- a/net/can/can_host.c +++ b/net/can/can_host.c @@ -53,6 +53,11 @@ static void can_host_connect(CanHostState *ch, Error **errp) CanHostClass *chc = CAN_HOST_GET_CLASS(ch); Error *local_err = NULL; + if (ch->bus == NULL) { + error_setg(errp, "'canbus' property not set"); + return; + } + chc->connect(ch, &local_err); if (local_err) { error_propagate(errp, local_err);