From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Florian Westphal , Taehee Yoo , Pablo Neira Ayuso Subject: [PATCH 4.4 13/47] netfilter: nf_tables: use WARN_ON_ONCE instead of BUG_ON in nft_do_chain() Date: Tue, 10 Jul 2018 20:24:37 +0200 Message-Id: <20180710182337.703383724@linuxfoundation.org> In-Reply-To: <20180710182337.047502999@linuxfoundation.org> References: <20180710182337.047502999@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Taehee Yoo 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 Signed-off-by: Taehee Yoo Acked-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso Signed-off-by: Greg Kroah-Hartman --- 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 @@ -167,7 +167,8 @@ 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;