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KVM: s390: Fix race in _destroy_pages_crste()

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Use READ_ONCE() in _destroy_pages_crste() to read the crste, avoid
dereferencing the pointer multiple times.

Fixes: a2c17f9270 ("KVM: s390: New gmap code")
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20260828115439.145885-9-imbrenda@linux.ibm.com>
This commit is contained in:
Claudio Imbrenda 2026-08-28 13:54:39 +02:00
parent 27554b9505
commit 4ca00a9154
1 changed files with 4 additions and 2 deletions
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6
arch/s390/kvm/gmap/gmap.c
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@ -994,11 +994,13 @@ static long _destroy_pages_pte(union pte *ptep, gfn_t gfn, gfn_t next, struct da
static long _destroy_pages_crste(union crste *crstep, gfn_t gfn, gfn_t next, struct dat_walk *walk)
{
phys_addr_t origin, cur, end;
union crste crste;
if (!crstep->h.fc || !crstep->s.fc1.pr)
crste = READ_ONCE(*crstep);
if (!crste.h.fc || !crste.s.fc1.pr)
return 0;
origin = crste_origin_large(*crstep);
origin = crste_origin_large(crste);
cur = ((max(gfn, walk->start) - gfn) << PAGE_SHIFT) + origin;
end = ((min(next, walk->end) - gfn) << PAGE_SHIFT) + origin;
for ( ; cur < end; cur += PAGE_SIZE)