Messages in this thread | | | Date | Fri, 24 Nov 2023 11:20:59 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH] mm/gup: Fix follow_devmap_p[mu]d() on page==NULL handling |
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On Thu, 23 Nov 2023 13:02:22 -0500 Peter Xu <peterx@redhat.com> wrote:
> This is a bug found not by any report but only by code observations. > > When GUP sees a devpmd/devpud and if page==NULL is returned, it means a > fault is probably required. Here falling through when page==NULL can cause > unexpected behavior. >
Well this is worrisome. We aren't able to construct a test case to demonstrate this bug? Why is that? Is it perhaps just dead code?
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