netfilter: nft_bitwise: fix register tracking

[ Upstream commit 14e8b293903785590a0ef168745ac84250cb1f4c ]

At the end of `nft_bitwise_reduce`, there is a loop which is intended to
update the bitwise expression associated with each tracked destination
register.  However, currently, it just updates the first register
repeatedly.  Fix it.

Fixes: 34cc9e52884a ("netfilter: nf_tables: cancel tracking for clobbered destination registers")
Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/netfilter/nft_bitwise.c b/net/netfilter/nft_bitwise.c
index e6e402b..b84312d 100644 (file)
--- a/net/netfilter/nft_bitwise.c
+++ b/net/netfilter/nft_bitwise.c
@@ -322,7 +322,7 @@ static bool nft_bitwise_reduce(struct nft_regs_track *track,
        dreg = priv->dreg;
        regcount = DIV_ROUND_UP(priv->len, NFT_REG32_SIZE);
        for (i = 0; i < regcount; i++, dreg++)
-               track->regs[priv->dreg].bitwise = expr;
+               track->regs[dreg].bitwise = expr;
 
        return false;
 }