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From:   Felix Fietkau <nbd@nbd.name>
To:     netdev@vger.kernel.org, John Crispin <john@phrozen.org>,
        Sean Wang <sean.wang@mediatek.com>,
        Mark Lee <Mark-MC.Lee@mediatek.com>,
        Lorenzo Bianconi <lorenzo@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Pablo Neira Ayuso <pablo@netfilter.org>
Cc:     linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH 4/5] net: ethernet: mtk_eth_soc: fix flow_offload related refcount bug
Date:   Wed, 23 Nov 2022 10:57:53 +0100
Message-Id: <20221123095754.36821-4-nbd@nbd.name>
In-Reply-To: <20221123095754.36821-1-nbd@nbd.name>
References: <20221123095754.36821-1-nbd@nbd.name>
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Since we call flow_block_cb_decref on FLOW_BLOCK_UNBIND, we need to call
flow_block_cb_incref unconditionally, even for a newly allocated cb.
Fixes a use-after-free bug

Fixes: 502e84e2382d ("net: ethernet: mtk_eth_soc: add flow offloading support")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 .../net/ethernet/mediatek/mtk_ppe_offload.c   | 21 ++++++++++++-------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
index 81afd5ee3fbf..412d215b9571 100644
--- a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
+++ b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
@@ -554,6 +554,7 @@ mtk_eth_setup_tc_block(struct net_device *dev, struct flow_block_offload *f)
 	struct mtk_eth *eth = mac->hw;
 	static LIST_HEAD(block_cb_list);
 	struct flow_block_cb *block_cb;
+	bool register_block = false;
 	flow_setup_cb_t *cb;
 
 	if (!eth->soc->offload_version)
@@ -568,16 +569,20 @@ mtk_eth_setup_tc_block(struct net_device *dev, struct flow_block_offload *f)
 	switch (f->command) {
 	case FLOW_BLOCK_BIND:
 		block_cb = flow_block_cb_lookup(f->block, cb, dev);
-		if (block_cb) {
-			flow_block_cb_incref(block_cb);
-			return 0;
+		if (!block_cb) {
+			block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
+			if (IS_ERR(block_cb))
+				return PTR_ERR(block_cb);
+
+			register_block = true;
 		}
-		block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
-		if (IS_ERR(block_cb))
-			return PTR_ERR(block_cb);
 
-		flow_block_cb_add(block_cb, f);
-		list_add_tail(&block_cb->driver_list, &block_cb_list);
+		flow_block_cb_incref(block_cb);
+
+		if (register_block) {
+			flow_block_cb_add(block_cb, f);
+			list_add_tail(&block_cb->driver_list, &block_cb_list);
+		}
 		return 0;
 	case FLOW_BLOCK_UNBIND:
 		block_cb = flow_block_cb_lookup(f->block, cb, dev);
-- 
2.38.1