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filter-buffer: fix segfault when starting qemu with status=off property
authorzhanghailiang <zhang.zhanghailiang@huawei.com>
Tue, 5 Apr 2016 03:43:55 +0000 (11:43 +0800)
committerJason Wang <jasowang@redhat.com>
Wed, 6 Apr 2016 01:52:07 +0000 (09:52 +0800)
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>
net/filter.c

index 1c4fc5a..8ac79f3 100644 (file)
@@ -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);
     }
 }