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netfilter: revalidate bridge ports

In the Linux kernel, the following vulnerability has been resolved: netfilter: revalidate bridge ports ebt_redirect_tg() dereferences br_port_get_rcu() return without a NULL check, causing a kernel panic when the bridge port has been removed between the original hook invocation and an NFQUEUE reinject. A mere NULL check isn't sufficient, however. As sashiko review points out userspace can not only remove the port from the bridge, it could also place the device in a different virtual device, e.g. macvlan. If this happens, we must drop the packet, there is no way for us to reinject it into the bridge path. Switch to _upper API, we don't need the bridge port structure. Also, this fix keeps another bug intact: Both nfnetlink_log and nfnetlink_queue use CONFIG_BRIDGE_NETFILTER too aggressive, which prevents certain logging features when queueing in bridge family: NETFILTER_FAMILY_BRIDGE can be enabled while the old CONFIG_BRIDGE_NETFILTER cruft is off. Fixes tag is a common ancestor, this was always broken.

Affected products

Linux
  • <ccb9fd4b87538ccf19ccff78ee26700526d94867
  • =<6.18.*
  • ==2.6.36
  • =<7.0.*
  • <4beffcd726e2a731cea4dc18e1fbc55c8d76f1a0
  • =<6.12.*
  • <d4b1301fd3c9e5e105fd3767c68bc4ba558bb228
  • <43330a1e8aace6b5a8de9aba127e9e394ab49b0f
  • <2.6.36
  • =<*