Re: [CFT][PATCH] fix descriptor uses in sound/core/compress_offload.c

[Al Viro <viro@xxxxxxxxxxxxxxxxxx>]

On Sun, Dec 29, 2024 at 09:35:13AM +0100, Takashi Iwai wrote:
> On Thu, 26 Dec 2024 23:17:26 +0100,
> Al Viro wrote:
> > 
> > On Thu, Dec 26, 2024 at 09:31:22PM +0000, Al Viro wrote:
> > > On Thu, Dec 26, 2024 at 08:00:18PM +0100, Jaroslav Kysela wrote:
> > > 
> > > >   I already made almost similar patch:
> > > > 
> > > > https://lore.kernel.org/linux-sound/20241217100726.732863-1-perex@xxxxxxxx/
> > > 
> > > Umm...  The only problem with your variant is that dma_buf_get()
> > > is wrong here - it should be get_dma_buf() on actual objects,
> > > and it should be done before fd_install().
> > 
> > Incremental on top of what just got merged into mainline:
> > 
> > Grab the references to dmabuf before moving them into descriptor
> > table - trying to do that by descriptor afterwards might end up getting
> > a different object, with a dangling reference left in task->{input,output}
> > 
> > Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
> 
> Could you resubmit this one as a formal patch to be merged?
> Thanks!

Done (https://lore.kernel.org/all/20241229185232.GA1977892@ZenIV/)