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xhci: Fix null pointer dereference in remove if xHC has only one roothub

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The remove path in xhci platform driver tries to remove and put both main
and shared hcds even if only a main hcd exists (one roothub)

This causes a null pointer dereference in reboot for those controllers.

Check that the shared_hcd exists before trying to remove it.

Fixes: e0fe986972 ("usb: host: xhci-plat: prepare operation w/o shared hcd")
Reported-by: Alexey Sheplyakov <asheplyakov@basealt.ru>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20220825150840.132216-2-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathias Nyman 2022-08-25 18:08:38 +03:00 committed by Greg Kroah-Hartman
parent 5f73aa2cf8
commit 4a593a62a9
1 changed files with 8 additions and 3 deletions
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11
drivers/usb/host/xhci-plat.c
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@ -398,12 +398,17 @@ static int xhci_plat_remove(struct platform_device *dev)
pm_runtime_get_sync(&dev->dev);
xhci->xhc_state |= XHCI_STATE_REMOVING;
usb_remove_hcd(shared_hcd);
xhci->shared_hcd = NULL;
if (shared_hcd) {
usb_remove_hcd(shared_hcd);
xhci->shared_hcd = NULL;
}
usb_phy_shutdown(hcd->usb_phy);
usb_remove_hcd(hcd);
usb_put_hcd(shared_hcd);
if (shared_hcd)
usb_put_hcd(shared_hcd);
clk_disable_unprepare(clk);
clk_disable_unprepare(reg_clk);