linux-kernel - Re: [PATCH][next] habanalabs: fix incorrect check on failed workqueue create

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Date:   Sun, 9 Aug 2020 15:03:28 +0300
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Colin King <colin.king@...onical.com>,
        Arnd Bergmann <arnd@...db.de>, Tomer Tayar <ttayar@...ana.ai>,
        Omer Shpigelman <oshpigelman@...ana.ai>,
        Ofir Bitton <obitton@...ana.ai>,
        kernel-janitors@...r.kernel.org,
        "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] habanalabs: fix incorrect check on failed workqueue create

On Sun, Aug 9, 2020 at 3:02 PM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Sun, Aug 09, 2020 at 02:02:18PM +0300, Oded Gabbay wrote:
> > On Fri, Jul 31, 2020 at 9:21 AM Greg Kroah-Hartman
> > <gregkh@...uxfoundation.org> wrote:
> > >
> > > On Thu, Jul 30, 2020 at 01:51:48PM +0300, Oded Gabbay wrote:
> > > > On Thu, Jul 30, 2020 at 11:20 AM Colin King <colin.king@...onical.com> wrote:
> > > > >
> > > > > From: Colin Ian King <colin.king@...onical.com>
> > > > >
> > > > > The null check on a failed workqueue create is currently null checking
> > > > > hdev->cq_wq rather than the pointer hdev->cq_wq[i] and so the test
> > > > > will never be true on a failed workqueue create. Fix this by checking
> > > > > hdev->cq_wq[i].
> > > > >
> > > > > Addresses-Coverity: ("Dereference before null check")
> > > > > Fixes: 5574cb2194b1 ("habanalabs: Assign each CQ with its own work queue")
> > > > > Signed-off-by: Colin Ian King <colin.king@...onical.com>
> > > > > ---
> > > > >  drivers/misc/habanalabs/common/device.c | 2 +-
> > > > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > > >
> > > > > diff --git a/drivers/misc/habanalabs/common/device.c b/drivers/misc/habanalabs/common/device.c
> > > > > index be16b75bdfdb..35214a186913 100644
> > > > > --- a/drivers/misc/habanalabs/common/device.c
> > > > > +++ b/drivers/misc/habanalabs/common/device.c
> > > > > @@ -288,7 +288,7 @@ static int device_early_init(struct hl_device *hdev)
> > > > >         for (i = 0 ; i < hdev->asic_prop.completion_queues_count ; i++) {
> > > > >                 snprintf(workq_name, 32, "hl-free-jobs-%u", i);
> > > > >                 hdev->cq_wq[i] = create_singlethread_workqueue(workq_name);
> > > > > -               if (hdev->cq_wq == NULL) {
> > > > > +               if (hdev->cq_wq[i] == NULL) {
> > > > >                         dev_err(hdev->dev, "Failed to allocate CQ workqueue\n");
> > > > >                         rc = -ENOMEM;
> > > > >                         goto free_cq_wq;
> > > > > --
> > > > > 2.27.0
> > > > >
> > > >
> > > > This patch is:
> > > > Reviewed-by: Oded Gabbay <oded.gabbay@...il.com>
> > > >
> > > > Greg, can you please apply it directly to the char-misc-next branch ?
> > > > I don't want to send a pull request for 1 patch.
> > >
> > > Already merged :)
> >
> > Hi Greg,
> > I can't find this patch in char-misc-next.
> > Can you please check if you applied it ?
>
> Oops, you are right, I did not take it, my fault, sorry.
>
> > If not, I'll apply it to my fixes tree and send it to you for -rc2
>
> That would be great, thanks for following up on this.
>
> greg k-h

Sure, np.
Thanks,
Oded