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Message-Id: <20180706054713.952076082@linuxfoundation.org>
Date: Fri, 6 Jul 2018 07:47:06 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Florian Westphal <fw@...len.de>,
Taehee Yoo <ap420073@...il.com>,
Pablo Neira Ayuso <pablo@...filter.org>
Subject: [PATCH 4.14 42/61] netfilter: nf_tables: use WARN_ON_ONCE instead of BUG_ON in nft_do_chain()
4.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Taehee Yoo <ap420073@...il.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@...len.de>
Signed-off-by: Taehee Yoo <ap420073@...il.com>
Acked-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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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