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authorShuah Khan <skhan@linuxfoundation.org>2020-10-07 01:39:14 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-10-07 10:25:48 +0300
commit9e8586827a7061fdb183e6571fac63af378be013 (patch)
tree19e5f532b74b2be75a5d1114267f28ec59414469 /drivers/usb/usbip/vhci_hcd.c
parenta4f88430af896bf34ec25a7a5f0e053fb3d928e0 (diff)
downloadlinux-9e8586827a7061fdb183e6571fac63af378be013.tar.xz
usbip: vhci_hcd: fix calling usb_hcd_giveback_urb() with irqs enabled
kcov testing uncovered call to usb_hcd_giveback_urb() without disabling interrupts. Link: https://lore.kernel.org/linux-usb/CAAeHK+wb4k-LGTjK9F5YbJNviF_+yU+wE_=Vpo9Rn7KFN8vG6Q@mail.gmail.com/ usb_hcd_giveback_urb() is called from vhci's urb_enqueue, when it determines it doesn't need to xmit the urb and can give it back. This path runs in task context. Disable irqs around usb_hcd_giveback_urb() call. Reported-by: Andrey Konovalov <andreyknvl@google.com> Suggested-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: Andrey Konovalov <andreyknvl@google.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org> Link: https://lore.kernel.org/r/20201006223914.39257-1-skhan@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/usbip/vhci_hcd.c')
-rw-r--r--drivers/usb/usbip/vhci_hcd.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/usb/usbip/vhci_hcd.c b/drivers/usb/usbip/vhci_hcd.c
index 1b598db5d8b9..66cde5e5f796 100644
--- a/drivers/usb/usbip/vhci_hcd.c
+++ b/drivers/usb/usbip/vhci_hcd.c
@@ -797,8 +797,14 @@ no_need_xmit:
usb_hcd_unlink_urb_from_ep(hcd, urb);
no_need_unlink:
spin_unlock_irqrestore(&vhci->lock, flags);
- if (!ret)
+ if (!ret) {
+ /* usb_hcd_giveback_urb() should be called with
+ * irqs disabled
+ */
+ local_irq_disable();
usb_hcd_giveback_urb(hcd, urb, urb->status);
+ local_irq_enable();
+ }
return ret;
}