[v1] Huge miscellaneous pull request for 2020-06-11

[PULL 038/115] hw/i386/vmport: Assert vmport initialized before registering commands

Paolo Bonzini posted 115 patches 5 years, 8 months ago

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Maintainers: Paolo Bonzini <pbonzini@redhat.com>, "Daniel P. Berrangé" <berrange@redhat.com>, Colin Xu <colin.xu@intel.com>, "Michael S. Tsirkin" <mst@redhat.com>, Wenchao Wang <wenchao.wang@intel.com>, Peter Maydell <peter.maydell@linaro.org>, Alex Williamson <alex.williamson@redhat.com>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, Fam Zheng <fam@euphon.net>, Igor Mammedov <imammedo@redhat.com>, Laurent Vivier <lvivier@redhat.com>, Marcelo Tosatti <mtosatti@redhat.com>, Roman Bolshakov <r.bolshakov@yadro.com>, Thomas Huth <thuth@redhat.com>, Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>, Richard Henderson <rth@twiddle.net>, Eduardo Habkost <ehabkost@redhat.com>, Hannes Reinecke <hare@suse.com>

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[PULL 038/115] hw/i386/vmport: Assert vmport initialized before registering commands

Posted by Paolo Bonzini 5 years, 8 months ago

From: Liran Alon <liran.alon@oracle.com>

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 <nikita.leshchenko@oracle.com>
Signed-off-by: Liran Alon <liran.alon@oracle.com>
Message-Id: <20200312165431.82118-17-liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/i386/vmport.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/hw/i386/vmport.c b/hw/i386/vmport.c
index 309cfd105b..79ef25d223 100644
--- a/hw/i386/vmport.c
+++ b/hw/i386/vmport.c
@@ -81,6 +81,8 @@ static VMPortState *port_state;
 void vmport_register(VMPortCommand command, VMPortReadFunc *func, void *opaque)
 {
     assert(command < VMPORT_ENTRIES);
+    assert(port_state);
+
     trace_vmport_register(command, func, opaque);
     port_state->func[command] = func;
     port_state->opaque[command] = opaque;
-- 
2.26.2