Messages in this thread | | | Date | Tue, 20 Aug 2019 07:36:07 +0200 | From | Florian Westphal <> | Subject | Re: [PATCH 1/1] netfilter: nf_tables: fib: Drop IPV6 packages if IPv6 is disabled on boot |
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Leonardo Bras <leonardo@linux.ibm.com> wrote: > If IPv6 is disabled on boot (ipv6.disable=1), but nft_fib_inet ends up > dealing with a IPv6 package, 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 > > Fix this behavior by dropping IPv6 packages if !ipv6_mod_enabled().
Wouldn't fib_netdev.c have the same problem?
If so, might be better to place this test in both nft_fib6_eval_type and nft_fib6_eval.
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