From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Tue, 20 Aug 2024 07:54:31 +0000 (+0200)
Subject: netfilter: nft_counter: Synchronize nft_counter_reset() against reader.
X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=a0b39e2dc7017ac667b70bdeee5293e410fab2fb;p=linux-2.6-microblaze.git

netfilter: nft_counter: Synchronize nft_counter_reset() against reader.

nft_counter_reset() resets the counter by subtracting the previously
retrieved value from the counter. This is a write operation on the
counter and as such it requires to be performed with a write sequence of
nft_counter_seq to serialize against its possible reader.

Update the packets/ bytes within write-sequence of nft_counter_seq.

Fixes: d84701ecbcd6a ("netfilter: nft_counter: rework atomic dump and reset")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Reviewed-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---

diff --git a/net/netfilter/nft_counter.c b/net/netfilter/nft_counter.c
index 16f40b503d37..eab0dc66bee6 100644
--- a/net/netfilter/nft_counter.c
+++ b/net/netfilter/nft_counter.c
@@ -107,11 +107,16 @@ static void nft_counter_reset(struct nft_counter_percpu_priv *priv,
 			      struct nft_counter *total)
 {
 	struct nft_counter *this_cpu;
+	seqcount_t *myseq;
 
 	local_bh_disable();
 	this_cpu = this_cpu_ptr(priv->counter);
+	myseq = this_cpu_ptr(&nft_counter_seq);
+
+	write_seqcount_begin(myseq);
 	this_cpu->packets -= total->packets;
 	this_cpu->bytes -= total->bytes;
+	write_seqcount_end(myseq);
 	local_bh_enable();
 }