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[NETFILTER]: nf_queue: clean up error paths 

Move duplicated error handling to end of function and add a helper function
to release the device and module references from the queue entry.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2007-12-05 01:27:19 -08:00 committed by David S. Miller
parent 4b3d15ef4a
commit daaa8be2e0
1 changed files with 40 additions and 53 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

93
net/netfilter/nf_queue.c
View File

@ -80,6 +80,27 @@ void nf_unregister_queue_handlers(const struct nf_queue_handler *qh)
}
EXPORT_SYMBOL_GPL(nf_unregister_queue_handlers);
static void nf_queue_entry_release_refs(struct nf_queue_entry *entry)
{
/* Release those devices we held, or Alexey will kill me. */
if (entry->indev)
dev_put(entry->indev);
if (entry->outdev)
dev_put(entry->outdev);
#ifdef CONFIG_BRIDGE_NETFILTER
if (entry->skb->nf_bridge) {
struct nf_bridge_info *nf_bridge = entry->skb->nf_bridge;
if (nf_bridge->physindev)
dev_put(nf_bridge->physindev);
if (nf_bridge->physoutdev)
dev_put(nf_bridge->physoutdev);
}
#endif
/* Drop reference to owner of hook which queued us. */
module_put(entry->elem->owner);
}
/*
* Any packet that leaves via this function must come back
* through nf_reinject().
@ -93,10 +114,10 @@ static int __nf_queue(struct sk_buff *skb,
unsigned int queuenum)
{
int status;
struct nf_queue_entry *entry;
struct nf_queue_entry *entry = NULL;
#ifdef CONFIG_BRIDGE_NETFILTER
struct net_device *physindev = NULL;
struct net_device *physoutdev = NULL;
struct net_device *physindev;
struct net_device *physoutdev;
#endif
struct nf_afinfo *afinfo;
const struct nf_queue_handler *qh;
@ -105,28 +126,16 @@ static int __nf_queue(struct sk_buff *skb,
rcu_read_lock();
qh = rcu_dereference(queue_handler[pf]);
if (!qh) {
rcu_read_unlock();
kfree_skb(skb);
return 1;
}
if (!qh)
goto err_unlock;
afinfo = nf_get_afinfo(pf);
if (!afinfo) {
rcu_read_unlock();
kfree_skb(skb);
return 1;
}
if (!afinfo)
goto err_unlock;
entry = kmalloc(sizeof(*entry) + afinfo->route_key_size, GFP_ATOMIC);
if (!entry) {
if (net_ratelimit())
printk(KERN_ERR "OOM queueing packet %p\n",
skb);
rcu_read_unlock();
kfree_skb(skb);
return 1;
}
if (!entry)
goto err_unlock;
*entry = (struct nf_queue_entry) {
.skb = skb,
@ -166,25 +175,18 @@ static int __nf_queue(struct sk_buff *skb,
rcu_read_unlock();
if (status < 0) {
/* James M doesn't say fuck enough. */
if (indev)
dev_put(indev);
if (outdev)
dev_put(outdev);
#ifdef CONFIG_BRIDGE_NETFILTER
if (physindev)
dev_put(physindev);
if (physoutdev)
dev_put(physoutdev);
#endif
module_put(entry->elem->owner);
kfree(entry);
kfree_skb(skb);
return 1;
nf_queue_entry_release_refs(entry);
goto err;
}
return 1;
err_unlock:
rcu_read_unlock();
err:
kfree_skb(skb);
kfree(entry);
return 1;
}
int nf_queue(struct sk_buff *skb,
@ -235,22 +237,7 @@ void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict)
rcu_read_lock();
/* Release those devices we held, or Alexey will kill me. */
if (entry->indev)
dev_put(entry->indev);
if (entry->outdev)
dev_put(entry->outdev);
#ifdef CONFIG_BRIDGE_NETFILTER
if (skb->nf_bridge) {
if (skb->nf_bridge->physindev)
dev_put(skb->nf_bridge->physindev);
if (skb->nf_bridge->physoutdev)
dev_put(skb->nf_bridge->physoutdev);
}
#endif
/* Drop reference to owner of hook which queued us. */
module_put(entry->elem->owner);
nf_queue_entry_release_refs(entry);
/* Continue traversal iff userspace said ok... */
if (verdict == NF_REPEAT) {