linux-kernel - [PATCH STABLE ONLY] add missing page refcount overflow checks

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Message-Id: <20191129090351.3507-1-vbabka@suse.cz>
Date:   Fri, 29 Nov 2019 10:03:48 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     stable@...r.kernel.org
Cc:     Ben Hutchings <ben.hutchings@...ethink.co.uk>,
        Matthew Wilcox <willy@...radead.org>,
        Ajay Kaher <akaher@...are.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Vlastimil Babka <vbabka@...e.cz>
Subject: [PATCH STABLE ONLY] add missing page refcount overflow checks

This collection of patches add the missing overflow checks in arch-specific
gup.c variants for x86 and s390. Those were missed in backport of 8fde12ca79af
("mm: prevent get_user_pages() from overflowing page refcount") as mainline
had a single gup.c implementation at that point. See individual patches for
details.

Vlastimil

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