[PATCH] spmi: mediatek: Fix UAF on device remove

From: Yu-Che Cheng
Date: Mon Jul 17 2023 - 05:42:26 EST


The pmif driver data that contains the clocks is allocated along with
spmi_controller.
On device remove, spmi_controller will be freed first, and then devres
, including the clocks, will be cleanup.
This leads to UAF because putting the clocks will access the clocks in
the pmif driver data, which is already freed along with spmi_controller.

This can be reproduced by enabling DEBUG_TEST_DRIVER_REMOVE and
building the kernel with KASAN.

Fix the UAF issue by using unmanaged clk_bulk_get() and putting the
clocks before freeing spmi_controller.

Reported-by: Fei Shao <fshao@xxxxxxxxxxxx>
Signed-off-by: Yu-Che Cheng <giver@xxxxxxxxxxxx>
---

drivers/spmi/spmi-mtk-pmif.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/spmi/spmi-mtk-pmif.c b/drivers/spmi/spmi-mtk-pmif.c
index b3c991e1ea40..74b73f9bc222 100644
--- a/drivers/spmi/spmi-mtk-pmif.c
+++ b/drivers/spmi/spmi-mtk-pmif.c
@@ -465,7 +465,7 @@ static int mtk_spmi_probe(struct platform_device *pdev)
for (i = 0; i < arb->nclks; i++)
arb->clks[i].id = pmif_clock_names[i];

- err = devm_clk_bulk_get(&pdev->dev, arb->nclks, arb->clks);
+ err = clk_bulk_get(&pdev->dev, arb->nclks, arb->clks);
if (err) {
dev_err(&pdev->dev, "Failed to get clocks: %d\n", err);
goto err_put_ctrl;
@@ -474,7 +474,7 @@ static int mtk_spmi_probe(struct platform_device *pdev)
err = clk_bulk_prepare_enable(arb->nclks, arb->clks);
if (err) {
dev_err(&pdev->dev, "Failed to enable clocks: %d\n", err);
- goto err_put_ctrl;
+ goto err_put_clks;
}

ctrl->cmd = pmif_arb_cmd;
@@ -498,6 +498,8 @@ static int mtk_spmi_probe(struct platform_device *pdev)

err_domain_remove:
clk_bulk_disable_unprepare(arb->nclks, arb->clks);
+err_put_clks:
+ clk_bulk_put(arb->nclks, arb->clks);
err_put_ctrl:
spmi_controller_put(ctrl);
return err;
@@ -509,6 +511,7 @@ static void mtk_spmi_remove(struct platform_device *pdev)
struct pmif *arb = spmi_controller_get_drvdata(ctrl);

clk_bulk_disable_unprepare(arb->nclks, arb->clks);
+ clk_bulk_put(arb->nclks, arb->clks);
spmi_controller_remove(ctrl);
spmi_controller_put(ctrl);
}
--
2.41.0.255.g8b1d071c50-goog