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Mon, 09 Mar 2020 23:52:59 +0000 Received: from abhmp0006.oracle.com (abhmp0006.oracle.com [141.146.116.12]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 029NqnNP010995; Mon, 9 Mar 2020 23:52:49 GMT Received: from spark.ravello.local (/213.57.127.2) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 09 Mar 2020 16:52:49 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=corp-2020-01-29; bh=xNTTI5x1kaKVAyyBglmkCirKohEDRlK9NBufy8H3NOk=; b=pHxkTscAUIHQ+UCPsQTHZ0G7XnmeKK+g6ftQuDA45OHIkzzN3rSMObOPKET4KmzVM3pC oKrOPygMimDV3/YkyPwWszG9wL1rO+dg4zUJWCarbVpBtX+uYzTtrBBp6Xpg1SihJBKB v/LPMqdaQp8c5baiBTzB9wlfXDAHNPa0hqqzpdIelE5mV9mzCrxrCTTvoWtVBxRB9eEI 5BGojiULc2iehANkuHdeplPL/YFXwCNgcEZgtsO1oG1uYoq/x89L59P+FR4zDymZSsGG L53tuXsLJ+4SG4qEgKvx7jv7j0DmXheyOVVxsGGb7LvscW0hwv8lvPGxv20AhR1iHJj2 fw== From: Liran Alon To: qemu-devel@nongnu.org Subject: [PATCH 14/14] hw/i386/vmport: Assert vmport initialized before registering commands Date: Tue, 10 Mar 2020 01:54:11 +0200 Message-Id: <20200309235411.76587-15-liran.alon@oracle.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200309235411.76587-1-liran.alon@oracle.com> References: <20200309235411.76587-1-liran.alon@oracle.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9555 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 mlxscore=0 mlxlogscore=999 spamscore=0 suspectscore=1 adultscore=0 malwarescore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2003090144 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9555 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 impostorscore=0 mlxlogscore=999 suspectscore=1 priorityscore=1501 lowpriorityscore=0 phishscore=0 adultscore=0 spamscore=0 mlxscore=0 clxscore=1015 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2003090143 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 156.151.31.85 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: ehabkost@redhat.com, mst@redhat.com, Liran Alon , Nikita Leshenko , pbonzini@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" vmport_register() is also called from other modules such as vmmouse. Therefore, these modules rely that vmport is realized before those call sites. If this is violated, vmport_register() will NULL-deref. To make such issues easier to debug, assert in vmport_register() that vmport is already realized. Reviewed-by: Nikita Leshenko Signed-off-by: Liran Alon --- hw/i386/vmport.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/hw/i386/vmport.c b/hw/i386/vmport.c index 95d4a23ce9ba..659a323e8448 100644 --- a/hw/i386/vmport.c +++ b/hw/i386/vmport.c @@ -68,6 +68,8 @@ static VMPortState *port_state; void vmport_register(VMPortCommand command, VMPortReadFunc *func, void *op= aque) { assert(command < VMPORT_ENTRIES); + assert(port_state); + trace_vmport_register(command, func, opaque); port_state->func[command] =3D func; port_state->opaque[command] =3D opaque; --=20 2.20.1