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qemu: require reply from guest agent in qemuAgentGetInterfaces

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Since its introduction in commit 0977b8aa07 (released in v1.2.14)
qemuAgentGetInterfaces calls qemuAgentCommand with needReply=false,
which allows qemuAgentCommand to return 0 even when it did not get
any reply from the agent.

Set needReply to true, since we dereference it right after.

This can be hit if libvirt is waiting for an event from the agent
(e.g. shutdown) and the agent cannot reply in time (e.g. due to
the guest being shut down), as reported in:
https://bugzilla.redhat.com/show_bug.cgi?id=1663051

Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
This commit is contained in:
Ján Tomko 2019-01-04 10:17:46 +01:00
parent c39a0993dc
commit 7cfd1fbb13
1 changed files with 1 additions and 1 deletions
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2
src/qemu/qemu_agent.c
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@ -2043,7 +2043,7 @@ qemuAgentGetInterfaces(qemuAgentPtr mon,
if (!(cmd = qemuAgentMakeCommand("guest-network-get-interfaces", NULL)))
goto cleanup;
if (qemuAgentCommand(mon, cmd, &reply, false,
if (qemuAgentCommand(mon, cmd, &reply, true,
VIR_DOMAIN_QEMU_AGENT_COMMAND_BLOCK) < 0)
goto cleanup;