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[NETFILTER]: Fix rcu race in ipt_REDIRECT 

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2005-09-13 13:48:58 -07:00 committed by David S. Miller
parent e7fa1bd93f
commit cd0bf2d796
1 changed files with 10 additions and 6 deletions
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16
net/ipv4/netfilter/ipt_REDIRECT.c
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@ -88,14 +88,18 @@ redirect_target(struct sk_buff **pskb,
newdst = htonl(0x7F000001);
else {
struct in_device *indev;
struct in_ifaddr *ifa;
/* Device might not have an associated in_device. */
indev = (struct in_device *)(*pskb)->dev->ip_ptr;
if (indev == NULL || indev->ifa_list == NULL)
newdst = 0;
rcu_read_lock();
indev = __in_dev_get((*pskb)->dev);
if (indev && (ifa = indev->ifa_list))
newdst = ifa->ifa_local;
rcu_read_unlock();
if (!newdst)
return NF_DROP;
/* Grab first address on interface. */
newdst = indev->ifa_list->ifa_local;
}
/* Transfer from original range. */