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Date:   Sat, 2 May 2020 17:43:01 +0200
From:   Markus Elfring <>
        Christian Bornträger <>,
        Claudio Imbrenda <>,
        Cornelia Huck <>,
        David Hildenbrand <>,
        Heiko Carstens <>,
        Janosch Frank <>,
        Vasily Gorbik <>
Cc:     LKML <>
Subject: KVM: s390/mm: Clarification for two return value checks in


I have tried another small script out for the semantic patch language.
This source code analysis approach points out that the function “gmap_find_shadow”
is called two times by the function “gmap_shadow”.

Null pointer checks are performed at these places.
The function “gmap_find_shadow” is documented in the same source file
that the pointer “ERR_PTR(-EAGAIN)” can eventually be returned.
Are the referenced gmap data structures always initialised here?


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