This is a note to let you know that I've just added the patch titled
net: ethernet: mtk_wed: fix use-after-free panic in mtk_wed_setup_tc_block_cb()
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-ethernet-mtk_wed-fix-use-after-free-panic-in-mtk.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 27604f03e6afa3369a7e71176b36887bad0b03fa
Author: Zheng Zhang <everything411@xxxxxx>
Date: Sat Aug 10 13:26:51 2024 +0800
net: ethernet: mtk_wed: fix use-after-free panic in mtk_wed_setup_tc_block_cb()
[ Upstream commit db1b4bedb9b97c6d34b03d03815147c04fffe8b4 ]
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: 799684448e3e ("net: ethernet: mtk_wed: introduce wed wo support")
Signed-off-by: Zheng Zhang <everything411@xxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/mediatek/mtk_wed.c b/drivers/net/ethernet/mediatek/mtk_wed.c
index c7196055c8c98..85a9ad2b86bff 100644
--- a/drivers/net/ethernet/mediatek/mtk_wed.c
+++ b/drivers/net/ethernet/mediatek/mtk_wed.c
@@ -1762,14 +1762,15 @@ 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);
}
@@ -1825,6 +1826,7 @@ 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:
