linux-kernel - Re: [PATCH 026/190] Revert "usb: dwc3: pci: Fix reference count leak in dwc3_pci_resume

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Date:   Mon, 26 Apr 2021 18:57:46 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Felipe Balbi <balbi@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Aditya Pakki <pakki001@....edu>
Subject: Re: [PATCH 026/190] Revert "usb: dwc3: pci: Fix reference count leak
 in dwc3_pci_resume_work"

On Thu, Apr 22, 2021 at 02:42:01PM +0300, Felipe Balbi wrote:
> 
> Hi,
> 
> Greg Kroah-Hartman <gregkh@...uxfoundation.org> writes:
> 
> > This reverts commit 2655971ad4b34e97dd921df16bb0b08db9449df7.
> >
> > Commits from @umn.edu addresses have been found to be submitted in "bad
> > faith" to try to test the kernel community's ability to review "known
> > malicious" changes.  The result of these submissions can be found in a
> > paper published at the 42nd IEEE Symposium on Security and Privacy
> > entitled, "Open Source Insecurity: Stealthily Introducing
> > Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University
> > of Minnesota) and Kangjie Lu (University of Minnesota).
> >
> > Because of this, all submissions from this group must be reverted from
> > the kernel tree and will need to be re-reviewed again to determine if
> > they actually are a valid fix.  Until that work is complete, remove this
> > change to ensure that no problems are being introduced into the
> > codebase.
> >
> > Cc: Aditya Pakki <pakki001@....edu>
> > Cc: Felipe Balbi <balbi@...nel.org>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > ---
> >  drivers/usb/dwc3/dwc3-pci.c | 4 +---
> >  1 file changed, 1 insertion(+), 3 deletions(-)
> >
> > diff --git a/drivers/usb/dwc3/dwc3-pci.c b/drivers/usb/dwc3/dwc3-pci.c
> > index 4c5c6972124a..0c0619f7b1a7 100644
> > --- a/drivers/usb/dwc3/dwc3-pci.c
> > +++ b/drivers/usb/dwc3/dwc3-pci.c
> > @@ -226,10 +226,8 @@ static void dwc3_pci_resume_work(struct work_struct *work)
> >  	int ret;
> >  
> >  	ret = pm_runtime_get_sync(&dwc3->dev);
> > -	if (ret) {
> > -		pm_runtime_put_sync_autosuspend(&dwc3->dev);
> > +	if (ret)
> >  		return;
> > -	}
> 
> this was a valid fix. pm_runtime_get_sync() leaves an unbalanced get on
> the runtime usage counter.
> 
> It's okay if you prefer to revert it and have a new review cycle for
> this, though.

I'll drop this revert now, thanks for the review.

greg k-h