Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.17 43/46] netfilter: nf_tables: use WARN_ON_ONCE instead of BUG_ON in nft_do_chain() | Date | Fri, 6 Jul 2018 07:47:04 +0200 |
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4.17-stable review patch. If anyone has any objections, please let me know.
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From: Taehee Yoo <ap420073@gmail.com>
commit adc972c5b88829d38ede08b1069718661c7330ae upstream.
When depth of chain is bigger than NFT_JUMP_STACK_SIZE, the nft_do_chain crashes. But there is no need to crash hard here.
Suggested-by: Florian Westphal <fw@strlen.de> Signed-off-by: Taehee Yoo <ap420073@gmail.com> Acked-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- net/netfilter/nf_tables_core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/net/netfilter/nf_tables_core.c +++ b/net/netfilter/nf_tables_core.c @@ -208,7 +208,8 @@ next_rule: switch (regs.verdict.code) { case NFT_JUMP: - BUG_ON(stackptr >= NFT_JUMP_STACK_SIZE); + if (WARN_ON_ONCE(stackptr >= NFT_JUMP_STACK_SIZE)) + return NF_DROP; jumpstack[stackptr].chain = chain; jumpstack[stackptr].rule = rule; jumpstack[stackptr].rulenum = rulenum;
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