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| author | Heiko Carstens <hca@linux.ibm.com> | 2026-07-20 10:58:28 +0200 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2026-07-30 00:29:10 +0200 |
| commit | 7cf227b2707ed0129018c283ffc8f893945586db (patch) | |
| tree | 6ad119e9e19c2963753aae0508c43ff9b9282820 | |
| parent | aab0734094cef631d611e404c389d89f0b869f5d (diff) | |
| download | linux-next-7cf227b2707ed0129018c283ffc8f893945586db.tar.gz linux-next-7cf227b2707ed0129018c283ffc8f893945586db.zip | |
s390/mm: Add missing mm check to do_secure_storage_access()
Similar like the normal exception handler the secure storage access
exception handler needs to verify if mm is not NULL, which may happen
with kernel threads.
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Closes: https://lore.kernel.org/all/20260717132345.539A11F00A3A@smtp.kernel.org/
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>> ---
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
| -rw-r--r-- | arch/s390/mm/fault.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c index 028aeb9c48d6..2839d7a64401 100644 --- a/arch/s390/mm/fault.c +++ b/arch/s390/mm/fault.c @@ -409,9 +409,9 @@ void do_secure_storage_access(struct pt_regs *regs) { union teid teid = { .val = regs->int_parm_long }; unsigned long addr = get_fault_address(regs); + struct mm_struct *mm = current->mm; struct vm_area_struct *vma; struct folio_walk fw; - struct mm_struct *mm; struct folio *folio; int rc; @@ -453,9 +453,8 @@ void do_secure_storage_access(struct pt_regs *regs) if (rc) return handle_fault_error_nolock(regs, 0); } else { - if (faulthandler_disabled()) + if (faulthandler_disabled() || !mm) return handle_fault_error_nolock(regs, 0); - mm = current->mm; mmap_read_lock(mm); vma = find_vma(mm, addr); if (!vma) |