diff options
| author | Yu-Che Cheng <giver@chromium.org> | 2023-12-06 15:17:25 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-12-15 17:27:04 +0100 |
| commit | e821d50ab5b956ed0effa49faaf29912fd4106d9 (patch) | |
| tree | 22dbbdd89dfb82a8c6ad175c228ff884914e0b6d /drivers/spmi | |
| parent | f200fff8d019f2754f91f5d715652e3e3fdf3604 (diff) | |
| download | lwn-e821d50ab5b956ed0effa49faaf29912fd4106d9.tar.gz lwn-e821d50ab5b956ed0effa49faaf29912fd4106d9.zip | |
spmi: mediatek: Fix UAF on device remove
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@chromium.org>
Signed-off-by: Yu-Che Cheng <giver@chromium.org>
Link: https://lore.kernel.org/r/20230717173934.1.If004a6e055a189c7f2d0724fa814422c26789839@changeid
Tested-by: Fei Shao <fshao@chromium.org>
Reviewed-by: Fei Shao <fshao@chromium.org>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20231206231733.4031901-3-sboyd@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/spmi')
| -rw-r--r-- | drivers/spmi/spmi-mtk-pmif.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/spmi/spmi-mtk-pmif.c b/drivers/spmi/spmi-mtk-pmif.c index 54c35f5535cb..1261f381cae6 100644 --- a/drivers/spmi/spmi-mtk-pmif.c +++ b/drivers/spmi/spmi-mtk-pmif.c @@ -475,7 +475,7 @@ 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; @@ -484,7 +484,7 @@ 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; @@ -510,6 +510,8 @@ 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; @@ -521,6 +523,7 @@ 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); } |