[PATCH] dma-buf: fix an error pointer vs NULL bug

[Dan Carpenter]

On Thu, Jul 06, 2023 at 08:21:35AM +0200, Christian König wrote:
> Am 06.07.23 um 07:52 schrieb Dan Carpenter:
> > The __dma_fence_unwrap_merge() function is supposed to return NULL on
> > error.  But the dma_fence_allocate_private_stub() returns error pointers
> > so check for that and covert the error pointers to NULL returns.
> > Otherwise, the callers do not expect error pointers and it leads to an
> > Oops.
> 
> Oh, good catch.
> 
> But I think we should probably change dma_fence_allocate_private_stub()
> instead, that this function returns an ERR_PTR doesn't seem to make to much
> sense.

Sure, I've sent v2.

regards,
dan carpenter