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net: filter: correctly remove filter from the list during finalization

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Qemu may crash when we want to add two filters on the same netdev but
the initialization of second fails (e.g missing parameters):

./qemu-system-x86_64 -netdev user,id=un0 \
 -object filter-buffer,id=f0,netdev=un0,interval=10 \
 -object filter-buffer,id=f1,netdev=un0
Segmentation fault (core dumped)

This is because we don't check whether or not the filter was in the
list of netdev. This patch fixes this.

Cc: Yang Hongyang <hongyang.yang@easystack.cn>
Reviewed-by: Yang Hongyang <hongyang.yang@easystack.cn>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Jason Wang 2016-02-15 12:52:34 +08:00
parent 415ab35a44
commit 5dd2d45e34
1 changed files with 2 additions and 1 deletions
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3
net/filter.c
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@ -196,7 +196,8 @@ static void netfilter_finalize(Object *obj)
nfc->cleanup(nf);
}
if (nf->netdev && !QTAILQ_EMPTY(&nf->netdev->filters)) {
if (nf->netdev && !QTAILQ_EMPTY(&nf->netdev->filters) &&
nf->next.tqe_prev) {
QTAILQ_REMOVE(&nf->netdev->filters, nf, next);
}
g_free(nf->netdev_id);