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usb: hcd: Fix use after free in usb_hcd_pci_remove()

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On the removal stage we put a reference to the controller structure and
if it's not used anymore it gets freed, but later we try to dereference
a pointer to a member of that structure.

Copy necessary field to a temporary variable to avoid use after free.

Fixes: 306c54d0ed ("usb: hcd: Try MSI interrupts on PCI devices")
Reported-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/linux-usb/30a8c4ca-64c2-863b-cfcd-0970599c0ba3@huawei.com/
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200814182218.71957-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andy Shevchenko 2020-08-14 21:22:18 +03:00 committed by Greg Kroah-Hartman
parent bed97b3096
commit 7b2816dd29
1 changed files with 4 additions and 1 deletions
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5
drivers/usb/core/hcd-pci.c
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@ -315,11 +315,14 @@ EXPORT_SYMBOL_GPL(usb_hcd_pci_probe);
void usb_hcd_pci_remove(struct pci_dev *dev)
{
struct usb_hcd *hcd;
int hcd_driver_flags;
hcd = pci_get_drvdata(dev);
if (!hcd)
return;
hcd_driver_flags = hcd->driver->flags;
if (pci_dev_run_wake(dev))
pm_runtime_get_noresume(&dev->dev);
@ -347,7 +350,7 @@ void usb_hcd_pci_remove(struct pci_dev *dev)
up_read(&companions_rwsem);
}
usb_put_hcd(hcd);
if ((hcd->driver->flags & HCD_MASK) < HCD_USB3)
if ((hcd_driver_flags & HCD_MASK) < HCD_USB3)
pci_free_irq_vectors(dev);
pci_disable_device(dev);
}