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net: ethernet: mtk_wed: fix use-after-free panic in mtk_wed_setup_tc_block_cb()

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When there are multiple ap interfaces on one band and with WED on,
turning the interface down will cause a kernel panic on MT798X.

Previously, cb_priv was freed in mtk_wed_setup_tc_block() without
marking NULL,and mtk_wed_setup_tc_block_cb() didn't check the value, too.

Assign NULL after free cb_priv in mtk_wed_setup_tc_block() and check NULL
in mtk_wed_setup_tc_block_cb().

----------
Unable to handle kernel paging request at virtual address 0072460bca32b4f5
Call trace:
 mtk_wed_setup_tc_block_cb+0x4/0x38
 0xffffffc0794084bc
 tcf_block_playback_offloads+0x70/0x1e8
 tcf_block_unbind+0x6c/0xc8
...
---------

Fixes: 799684448e ("net: ethernet: mtk_wed: introduce wed wo support")
Signed-off-by: Zheng Zhang <everything411@qq.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Zheng Zhang 2024-08-10 13:26:51 +08:00 committed by David S. Miller
parent 32316f676b
commit db1b4bedb9
1 changed files with 4 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/net/ethernet/mediatek/mtk_wed.c
View File

@ -2666,14 +2666,15 @@ mtk_wed_setup_tc_block_cb(enum tc_setup_type type, void *type_data, void *cb_pri
{
struct mtk_wed_flow_block_priv *priv = cb_priv;
struct flow_cls_offload *cls = type_data;
struct mtk_wed_hw *hw = priv->hw;
struct mtk_wed_hw *hw = NULL;
if (!tc_can_offload(priv->dev))
if (!priv || !tc_can_offload(priv->dev))
return -EOPNOTSUPP;
if (type != TC_SETUP_CLSFLOWER)
return -EOPNOTSUPP;
hw = priv->hw;
return mtk_flow_offload_cmd(hw->eth, cls, hw->index);
}
@ -2729,6 +2730,7 @@ mtk_wed_setup_tc_block(struct mtk_wed_hw *hw, struct net_device *dev,
flow_block_cb_remove(block_cb, f);
list_del(&block_cb->driver_list);
kfree(block_cb->cb_priv);
block_cb->cb_priv = NULL;
}
return 0;
default: