linux-kernel - Re: [PATCH] dma-buf: free dmabuf->name in dma_buf

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Date:   Thu, 27 Feb 2020 13:38:03 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        LKML <linux-kernel@...r.kernel.org>,
        linaro-mm-sig@...ts.linaro.org,
        syzbot+b2098bc44728a4efb3e9@...kaller.appspotmail.com,
        Chenbo Feng <fengc@...gle.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] dma-buf: free dmabuf->name in dma_buf_release()

On Tue, Feb 25, 2020 at 5:54 PM Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> On Tue, 25 Feb 2020 12:44:46 -0800 Cong Wang <xiyou.wangcong@...il.com> wrote:
>
> > dma-buff name can be set via DMA_BUF_SET_NAME ioctl, but once set
> > it never gets freed.
> >
> > Free it in dma_buf_release().
> >
> > ...
> >
> > --- a/drivers/dma-buf/dma-buf.c
> > +++ b/drivers/dma-buf/dma-buf.c
> > @@ -108,6 +108,7 @@ static int dma_buf_release(struct inode *inode, struct file *file)
> >               dma_resv_fini(dmabuf->resv);
> >
> >       module_put(dmabuf->owner);
> > +     kfree(dmabuf->name);
> >       kfree(dmabuf);
> >       return 0;
> >  }
>
> ow.  Is that ioctl privileged?

It looks unprivileged to me, as I don't see capable() called along
the path.

Thanks.