linux-kernel - [PATCH AUTOSEL 6.1 10/27] spmi: mediatek: Fix UAF on device remove

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Date: Sun, 28 Jan 2024 11:13:55 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Yu-Che Cheng <giver@...omium.org>,
	Fei Shao <fshao@...omium.org>,
	Chen-Yu Tsai <wenst@...omium.org>,
	Stephen Boyd <sboyd@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sasha Levin <sashal@...nel.org>,
	matthias.bgg@...il.com,
	angelogioacchino.delregno@...labora.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.1 10/27] spmi: mediatek: Fix UAF on device remove

From: Yu-Che Cheng <giver@...omium.org>

[ Upstream commit e821d50ab5b956ed0effa49faaf29912fd4106d9 ]

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@...omium.org>
Signed-off-by: Yu-Che Cheng <giver@...omium.org>
Link: https://lore.kernel.org/r/20230717173934.1.If004a6e055a189c7f2d0724fa814422c26789839@changeid
Tested-by: Fei Shao <fshao@...omium.org>
Reviewed-by: Fei Shao <fshao@...omium.org>
Reviewed-by: Chen-Yu Tsai <wenst@...omium.org>
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
Link: https://lore.kernel.org/r/20231206231733.4031901-3-sboyd@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 ad511f2c3324..739ad0cbd3bb 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 int 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);
 	return 0;
-- 
2.43.0