From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Mon, 5 Jul 2021 18:14:21 +0000 (+0200)
Subject: netfilter: nft_last: incorrect arithmetics when restoring last used
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=d1b5b80da7058883758df2b5b7f506d4d4f9a5fa;p=linux.git

netfilter: nft_last: incorrect arithmetics when restoring last used

Subtract the jiffies that have passed by to current jiffies to fix last
used restoration.

Fixes: 836382dc2471 ("netfilter: nf_tables: add last expression")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---

diff --git a/net/netfilter/nft_last.c b/net/netfilter/nft_last.c
index bbb352b64c737..8088b99f2ee3e 100644
--- a/net/netfilter/nft_last.c
+++ b/net/netfilter/nft_last.c
@@ -37,7 +37,7 @@ static int nft_last_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
 		if (err < 0)
 			return err;
 
-		priv->last_jiffies = jiffies + (unsigned long)last_jiffies;
+		priv->last_jiffies = jiffies - (unsigned long)last_jiffies;
 	}
 
 	return 0;