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| author |   Leonardo Bras <leonardo@linux.ibm.com> | 2019-08-30 15:13:53 -0300 |
|---|---|---|
| committer |   Pablo Neira Ayuso <pablo@netfilter.org> | 2019-09-03 22:53:56 +0200 |
| commit | 88209141392a4a2521a2f67c13d7db5e84efbb58 (patch) | |
| tree | 05f1ede317f6cadcbed2d1f6cdad0a8111384ba1 /net/core/skbuff.c | |
| parent | netfilter: nft_socket: fix erroneous socket assignment (diff) | |
| download | wireguard-linux-88209141392a4a2521a2f67c13d7db5e84efbb58.tar.xz wireguard-linux-88209141392a4a2521a2f67c13d7db5e84efbb58.zip | |
netfilter: nft_fib_netdev: Terminate rule eval if protocol=IPv6 and ipv6 module is disabled
If IPv6 is disabled on boot (ipv6.disable=1), but nft_fib_inet ends up
dealing with a IPv6 packet, it causes a kernel panic in
fib6_node_lookup_1(), crashing in bad_page_fault.
The panic is caused by trying to deference a very low address (0x38
in ppc64le), due to ipv6.fib6_main_tbl = NULL.
BUG: Kernel NULL pointer dereference at 0x00000038
The kernel panic was reproduced in a host that disabled IPv6 on boot and
have to process guest packets (coming from a bridge) using it's ip6tables.
Terminate rule evaluation when packet protocol is IPv6 but the ipv6 module
is not loaded.
Signed-off-by: Leonardo Bras <leonardo@linux.ibm.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/core/skbuff.c')
0 files changed, 0 insertions, 0 deletions