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53 lines
1.6 KiB
Diff
53 lines
1.6 KiB
Diff
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From: Felix Fietkau <nbd@nbd.name>
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Date: Thu, 17 Nov 2022 11:58:21 +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
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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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@@ -561,6 +561,7 @@ mtk_eth_setup_tc_block(struct net_device
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struct mtk_eth *eth = mac->hw;
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static LIST_HEAD(block_cb_list);
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struct flow_block_cb *block_cb;
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+ bool register_block = false;
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flow_setup_cb_t *cb;
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if (!eth->soc->offload_version)
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@@ -575,16 +576,20 @@ mtk_eth_setup_tc_block(struct net_device
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switch (f->command) {
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case FLOW_BLOCK_BIND:
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block_cb = flow_block_cb_lookup(f->block, cb, dev);
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- if (block_cb) {
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- flow_block_cb_incref(block_cb);
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- return 0;
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+ if (!block_cb) {
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+ block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
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+ if (IS_ERR(block_cb))
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+ return PTR_ERR(block_cb);
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+
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+ register_block = true;
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}
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- block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
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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_add(block_cb, f);
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- list_add_tail(&block_cb->driver_list, &block_cb_list);
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+ flow_block_cb_incref(block_cb);
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+
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+ if (register_block) {
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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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+ }
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return 0;
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case FLOW_BLOCK_UNBIND:
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block_cb = flow_block_cb_lookup(f->block, cb, dev);
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