[PATCH] qemu: Prevent crash of libvirtd without guest agent

[ajia@xxxxxxxxxx]

From: Alex Jia <ajia@xxxxxxxxxx>

* src/qemu/qemu_process.c (qemuFindAgentConfig): avoid crash libvirtd due to
deref a NULL pointer.

* How to reproduce?
1. virsh edit the following xml into guest configuration:

    <channel type='pty'>
      <target type='virtio'/>
      <address type='virtio-serial' controller='0' bus='0' port='1'/>
    </channel>
2. virsh start <domain>

or 
% virt-install -n foo -r 1024 --disk path=/var/lib/libvirt/images/foo.img,size=1 \
--channel pty,target_type=virtio -l <installation tree>

Signed-off-by: Alex Jia <ajia@xxxxxxxxxx>
---
 src/qemu/qemu_process.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 2d92d66..6dc1732 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -189,11 +189,14 @@ qemuFindAgentConfig(virDomainDefPtr def)
 
     for (i = 0 ; i < def->nchannels ; i++) {
         virDomainChrDefPtr channel = def->channels[i];
+        if(!channel)
+            break;
 
         if (channel->targetType != VIR_DOMAIN_CHR_CHANNEL_TARGET_TYPE_VIRTIO)
             continue;
 
-        if (STREQ(channel->target.name, "org.qemu.guest_agent.0")) {
+        if (channel->target.name && 
+            STREQ(channel->target.name, "org.qemu.guest_agent.0")) {
             config = &channel->source;
             break;
         }
-- 
1.7.1

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