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34 lines
1.1 KiB
Diff
34 lines
1.1 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
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Date: Mon, 20 Mar 2023 15:49:15 +0100
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Subject: [PATCH] net: ethernet: mtk_eth_soc: fix flow_offload related refcount
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bug
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Since we call flow_block_cb_decref on FLOW_BLOCK_UNBIND, we need to call
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flow_block_cb_incref unconditionally, even for a newly allocated cb.
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Fixes a use-after-free bug. Also fix the accidentally inverted refcount
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check on unbind.
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Fixes: 502e84e2382d ("net: ethernet: mtk_eth_soc: add flow offloading support")
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
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+++ b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
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@@ -584,6 +584,7 @@ mtk_eth_setup_tc_block(struct net_device
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if (IS_ERR(block_cb))
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return PTR_ERR(block_cb);
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+ flow_block_cb_incref(block_cb);
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flow_block_cb_add(block_cb, f);
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list_add_tail(&block_cb->driver_list, &block_cb_list);
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return 0;
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@@ -592,7 +593,7 @@ mtk_eth_setup_tc_block(struct net_device
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if (!block_cb)
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return -ENOENT;
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- if (flow_block_cb_decref(block_cb)) {
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+ if (!flow_block_cb_decref(block_cb)) {
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flow_block_cb_remove(block_cb, f);
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list_del(&block_cb->driver_list);
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}
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