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[Qemu-devel] [PATCH] net: filter: correctly remove filter from the list
From: |
Jason Wang |
Subject: |
[Qemu-devel] [PATCH] net: filter: correctly remove filter from the list during finalization |
Date: |
Wed, 24 Feb 2016 11:44:51 +0800 |
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 <address@hidden>
Signed-off-by: Jason Wang <address@hidden>
---
net/filter.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/filter.c b/net/filter.c
index d2a514e..7cdbc6c 100644
--- a/net/filter.c
+++ b/net/filter.c
@@ -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);
--
2.5.0
- [Qemu-devel] [PATCH] net: filter: correctly remove filter from the list during finalization,
Jason Wang <=