From: Patrick McHardy Date: Sun, 20 Jan 2008 14:25:48 +0000 (-0800) Subject: [NETFILTER]: bridge-netfilter: fix net_device refcnt leaks X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=2dc2f207fb251666d2396fe1a69272b307ecc333;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git [NETFILTER]: bridge-netfilter: fix net_device refcnt leaks When packets are flood-forwarded to multiple output devices, the bridge-netfilter code reuses skb->nf_bridge for each clone to store the bridge port. When queueing packets using NFQUEUE netfilter takes a reference to skb->nf_bridge->physoutdev, which is overwritten when the packet is forwarded to the second port. This causes refcount unterflows for the first device and refcount leaks for all others. Additionally this provides incorrect data to the iptables physdev match. Unshare skb->nf_bridge by copying it if it is shared before assigning the physoutdev device. Reported, tested and based on initial patch by Jan Christoph Nordholz . Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c index 5d8b939eded1..9f78a69d6b8b 100644 --- a/net/bridge/br_netfilter.c +++ b/net/bridge/br_netfilter.c @@ -142,6 +142,23 @@ static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) return skb->nf_bridge; } +static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) +{ + struct nf_bridge_info *nf_bridge = skb->nf_bridge; + + if (atomic_read(&nf_bridge->use) > 1) { + struct nf_bridge_info *tmp = nf_bridge_alloc(skb); + + if (tmp) { + memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); + atomic_set(&tmp->use, 1); + nf_bridge_put(nf_bridge); + } + nf_bridge = tmp; + } + return nf_bridge; +} + static inline void nf_bridge_push_encap_header(struct sk_buff *skb) { unsigned int len = nf_bridge_encap_header_len(skb); @@ -637,6 +654,11 @@ static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff *skb, if (!skb->nf_bridge) return NF_ACCEPT; + /* Need exclusive nf_bridge_info since we might have multiple + * different physoutdevs. */ + if (!nf_bridge_unshare(skb)) + return NF_DROP; + parent = bridge_parent(out); if (!parent) return NF_DROP; @@ -718,6 +740,11 @@ static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff *skb, if (!skb->nf_bridge) return NF_ACCEPT; + /* Need exclusive nf_bridge_info since we might have multiple + * different physoutdevs. */ + if (!nf_bridge_unshare(skb)) + return NF_DROP; + nf_bridge = skb->nf_bridge; if (!(nf_bridge->mask & BRNF_BRIDGED_DNAT)) return NF_ACCEPT;