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| author | Patrick McHardy <kaber@trash.net> | 2005-09-13 20:48:58 (GMT) |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2005-09-13 20:48:58 (GMT) |
| commit | cd0bf2d796ebb51c346b1ed4208cdbfd86e98a61 (patch) | |
| tree | 2ea4c92974433cbb0ebb088749d88e80380ee7cd | |
| parent | e7fa1bd93f977c03050bd6b3d13846aa43310fef (diff) | |
| download | linux-cd0bf2d796ebb51c346b1ed4208cdbfd86e98a61.tar.xz | |
[NETFILTER]: Fix rcu race in ipt_REDIRECT
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/netfilter/ipt_REDIRECT.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/net/ipv4/netfilter/ipt_REDIRECT.c b/net/ipv4/netfilter/ipt_REDIRECT.c index d2e1344..715cb61 100644 --- a/net/ipv4/netfilter/ipt_REDIRECT.c +++ b/net/ipv4/netfilter/ipt_REDIRECT.c @@ -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) - return NF_DROP; + newdst = 0; + + rcu_read_lock(); + indev = __in_dev_get((*pskb)->dev); + if (indev && (ifa = indev->ifa_list)) + newdst = ifa->ifa_local; + rcu_read_unlock(); - /* Grab first address on interface. */ - newdst = indev->ifa_list->ifa_local; + if (!newdst) + return NF_DROP; } /* Transfer from original range. */ |