diff options
| author | Claudio Imbrenda <imbrenda@linux.ibm.com> | 2026-06-11 12:48:47 +0200 |
|---|---|---|
| committer | Claudio Imbrenda <imbrenda@linux.ibm.com> | 2026-06-11 13:50:09 +0200 |
| commit | 5670b7f927f8d98685f3f5873dbf9f8d7a5a63f3 (patch) | |
| tree | 2787b55e8c89b7e97f6f9741310e204b87048b42 /arch/s390 | |
| parent | f79413b2dde10829a1b526543e725dd5c1847e9a (diff) | |
KVM: s390: Fix unlikely race in try_get_locked_pte()
Fix an unlikely race in try_get_locked_pte(), which could have happened
if puds or pmds get unmapped between the p?dp_get() and p?d_offset()
functions.
Fixes: 89fa757931dc ("KVM: s390: Avoid potentially sleeping while atomic when zapping pages")
CC: stable@vger.kernel.org # 7.1
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20260611104850.110313-3-imbrenda@linux.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/mm/gmap_helpers.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/s390/mm/gmap_helpers.c b/arch/s390/mm/gmap_helpers.c index 1cfe4724fbe2..ee3f37af8aee 100644 --- a/arch/s390/mm/gmap_helpers.c +++ b/arch/s390/mm/gmap_helpers.c @@ -51,15 +51,15 @@ pte_t *try_get_locked_pte(struct mm_struct *mm, unsigned long vmaddr, spinlock_t pgd = pgdp_get(pgdp); if (pgd_none(pgd) || !pgd_present(pgd)) return NULL; - p4dp = p4d_offset(pgdp, vmaddr); + p4dp = p4d_offset_lockless(pgdp, pgd, vmaddr); p4d = p4dp_get(p4dp); if (p4d_none(p4d) || !p4d_present(p4d)) return NULL; - pudp = pud_offset(p4dp, vmaddr); + pudp = pud_offset_lockless(p4dp, p4d, vmaddr); pud = pudp_get(pudp); if (pud_none(pud) || pud_leaf(pud) || !pud_present(pud)) return NULL; - pmdp = pmd_offset(pudp, vmaddr); + pmdp = pmd_offset_lockless(pudp, pud, vmaddr); pmd = pmdp_get_lockless(pmdp); if (pmd_none(pmd) || pmd_leaf(pmd) || !pmd_present(pmd)) return NULL; |