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filter-buffer: fix segfault when starting qemu with status=off property

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After commit 338d3f, we support 'status' property for filter object.
The segfault can be triggered by starting qemu with 'status=off' property
for filter, when the s->incoming_queue is NULL, we reference it directly
in qemu_net_queue_flush() which was called in status_changed() callback
function.

We shouldn't trigger status_changed() before the filter was initialized,
We can check the value of 'nf->netdev' to confirm if the filter is
initialized or not, so let's check its value before calling
status_changed().

Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
zhanghailiang 2016-04-05 11:43:55 +08:00 committed by Jason Wang
parent 91731d5f6d
commit e0a039e50d
1 changed files with 1 additions and 1 deletions
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2
net/filter.c
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@ -164,7 +164,7 @@ static void netfilter_set_status(Object *obj, const char *str, Error **errp)
return;
}
nf->on = !nf->on;
if (nfc->status_changed) {
if (nf->netdev && nfc->status_changed) {
nfc->status_changed(nf, errp);
}
}