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usb: musb: musb_dsps: request_irq() after initializing musb 

[ Upstream commit 7c75bde329d7e2a93cf86a5c15c61f96f1446cdc ]

If IRQ occurs between calling  dsps_setup_optional_vbus_irq()
and  dsps_create_musb_pdev(), then null pointer dereference occurs
since glue->musb wasn't initialized yet.

The patch puts initializing of neccesery data before registration
of the interrupt handler.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Nadezda Lutovinova <lutovinova@ispras.ru>
Link: https://lore.kernel.org/r/20210819163323.17714-1-lutovinova@ispras.ru
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Nadezda Lutovinova 2021-08-19 19:33:23 +03:00 committed by Greg Kroah-Hartman
parent d24381e5a7
commit 9a4a680529
1 changed files with 6 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/usb/musb/musb_dsps.c
View File

@ -890,23 +890,22 @@ static int dsps_probe(struct platform_device *pdev)
if (!glue->usbss_base)
return -ENXIO;
if (usb_get_dr_mode(&pdev->dev) == USB_DR_MODE_PERIPHERAL) {
ret = dsps_setup_optional_vbus_irq(pdev, glue);
if (ret)
goto err_iounmap;
}
platform_set_drvdata(pdev, glue);
pm_runtime_enable(&pdev->dev);
ret = dsps_create_musb_pdev(glue, pdev);
if (ret)
goto err;
if (usb_get_dr_mode(&pdev->dev) == USB_DR_MODE_PERIPHERAL) {
ret = dsps_setup_optional_vbus_irq(pdev, glue);
if (ret)
goto err;
}
return 0;
err:
pm_runtime_disable(&pdev->dev);
err_iounmap:
iounmap(glue->usbss_base);
return ret;
}