+ dma-buf-free-dmabuf-name-in-dma_buf_release.patch added to -mm tree

[Daniel Vetter]

On Wed, Feb 26, 2020 at 5:29 AM Sumit Semwal <sumit.semwal at linaro.org> wrote:
>
> Hello Andrew,
>
>
> On Wed, 26 Feb 2020 at 07:25, Andrew Morton <akpm at linux-foundation.org> wrote:
> >
> >
> > The patch titled
> >      Subject: dma-buf: free dmabuf->name in dma_buf_release()
> > has been added to the -mm tree.  Its filename is
> >      dma-buf-free-dmabuf-name-in-dma_buf_release.patch
>
> Thanks for taking this patch via -mm during my absence (I'm just
> returning from a bit of an illness). If there are other dma-buf
> patches on your radar that you'd like to take via the mm tree, please
> let me know and I can provide the necessary Acks.
> Else I will take them in via drm-misc as usual.

I thought at least that for cases like these -mm is the last resort
tree, so proper thing to do here is apply this fix to drm-misc-fixes
and get it out there. -mm rebases, so will fall out again.

Also maybe we should have had some tests for this, plus some
integration with the gem object name instead of duplicating buffer
object names everywhere for different reasons.
-Daniel

>
> >
> > This patch should soon appear at
> >     http://ozlabs.org/~akpm/mmots/broken-out/dma-buf-free-dmabuf-name-in-dma_buf_release.patch
> > and later at
> >     http://ozlabs.org/~akpm/mmotm/broken-out/dma-buf-free-dmabuf-name-in-dma_buf_release.patch
> >
> > Before you just go and hit "reply", please:
> >    a) Consider who else should be cc'ed
> >    b) Prefer to cc a suitable mailing list as well
> >    c) Ideally: find the original patch on the mailing list and do a
> >       reply-to-all to that, adding suitable additional cc's
> >
> > *** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
> >
> > The -mm tree is included into linux-next and is updated
> > there every 3-4 working days
> >
> > ------------------------------------------------------
> > From: Cong Wang <xiyou.wangcong at gmail.com>
> > Subject: dma-buf: free dmabuf->name in dma_buf_release()
> >
> > 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().
> >
> > Link: http://lkml.kernel.org/r/20200225204446.11378-1-xiyou.wangcong@gmail.com
> > Fixes: bb2bb9030425 ("dma-buf: add DMA_BUF_SET_NAME ioctls")
> > Reported-by: syzbot+b2098bc44728a4efb3e9 at syzkaller.appspotmail.com
> > Signed-off-by: Cong Wang <xiyou.wangcong at gmail.com>
> > Reviewed-by: Andrew Morton <akpm at linux-foundation.org>
> > Acked-by: Chenbo Feng <fengc at google.com>
> > Cc: Sumit Semwal <sumit.semwal at linaro.org>
> > Cc: Greg Hackmann <ghackmann at google.com>
> > Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
> > ---
> >
> >  drivers/dma-buf/dma-buf.c |    1 +
> >  1 file changed, 1 insertion(+)
> >
> > --- a/drivers/dma-buf/dma-buf.c~dma-buf-free-dmabuf-name-in-dma_buf_release
> > +++ a/drivers/dma-buf/dma-buf.c
> > @@ -108,6 +108,7 @@ static int dma_buf_release(struct inode
> >                 dma_resv_fini(dmabuf->resv);
> >
> >         module_put(dmabuf->owner);
> > +       kfree(dmabuf->name);
> >         kfree(dmabuf);
> >         return 0;
> >  }
> > _
> >
> > Patches currently in -mm which might be from xiyou.wangcong at gmail.com are
> >
> > dma-buf-free-dmabuf-name-in-dma_buf_release.patch
> >
> Thanks and best regards,
> Sumit.
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> dri-devel at lists.freedesktop.org
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch