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

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);