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s390/mm: Add missing mm check to do_secure_storage_access()

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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>
This commit is contained in:
Heiko Carstens
2026-07-20 10:58:28 +02:00
committed by Vasily Gorbik
parent aab0734094
commit 7cf227b270
1 changed files with 2 additions and 3 deletions
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5
arch/s390/mm/fault.c
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@@ -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)