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qemu: agent: take monitor lock in qemuAgentNotifyEvent

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qemuAgentNotifyEvent accesses monitor structure and is called on qemu
reset/shutdown/suspend events under domain lock. Other monitor
functions on the other hand take monitor lock and don't hold domain lock.
Thus it is possible to have risky simultaneous access to the structure
from 2 threads. Let's take monitor lock here to make access exclusive.
This commit is contained in:
Nikolay Shirokovskiy 2016-12-12 12:13:44 +03:00 committed by John Ferlan
parent c9a191fc48
commit cdd6819318
1 changed files with 4 additions and 0 deletions
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4
src/qemu/qemu_agent.c
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@ -1248,6 +1248,8 @@ qemuAgentMakeStringsArray(const char **strings, unsigned int len)
void qemuAgentNotifyEvent(qemuAgentPtr mon,
qemuAgentEvent event)
{
virObjectLock(mon);
VIR_DEBUG("mon=%p event=%d await_event=%d", mon, event, mon->await_event);
if (mon->await_event == event) {
mon->await_event = QEMU_AGENT_EVENT_NONE;
@ -1257,6 +1259,8 @@ void qemuAgentNotifyEvent(qemuAgentPtr mon,
virCondSignal(&mon->notify);
}
}
virObjectUnlock(mon);
}
VIR_ENUM_DECL(qemuAgentShutdownMode);