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hw/i386/vmport: Assert vmport initialized before registering commands 

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>
This commit is contained in:
Liran Alon 2020-03-12 18:54:31 +02:00 committed by Paolo Bonzini
parent d6048bfd12
commit 23accdf162
1 changed files with 2 additions and 0 deletions
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hw/i386/vmport.c
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@ -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;