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charset="utf-8" From: "Liam R. Howlett" Adding support for a NULL vma means the init_vma_munmap() can be initialized for a less error-prone process when calling vms_complete_munmap_vmas() later on. Signed-off-by: Liam R. Howlett Reviewed-by: Lorenzo Stoakes --- mm/mmap.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index a1544a68558e..722bcced0499 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -517,9 +517,14 @@ static inline void init_vma_munmap(struct vma_munmap_s= truct *vms, { vms->vmi =3D vmi; vms->vma =3D vma; - vms->mm =3D vma->vm_mm; - vms->start =3D start; - vms->end =3D end; + if (vma) { + vms->mm =3D vma->vm_mm; + vms->start =3D start; + vms->end =3D end; + } else { + vms->mm =3D NULL; + vms->start =3D vms->end =3D 0; + } vms->unlock =3D unlock; vms->uf =3D uf; vms->vma_count =3D 0; @@ -2950,11 +2955,11 @@ unsigned long mmap_region(struct file *file, unsign= ed long addr, =20 /* Find the first overlapping VMA */ vma =3D vma_find(&vmi, end); + init_vma_munmap(&vms, &vmi, vma, addr, end, uf, /* unlock =3D */ false); if (vma) { mt_init_flags(&mt_detach, vmi.mas.tree->ma_flags & MT_FLAGS_LOCK_MASK); mt_on_stack(mt_detach); mas_init(&mas_detach, &mt_detach, /* addr =3D */ 0); - init_vma_munmap(&vms, &vmi, vma, addr, end, uf, /* unlock =3D */ false); /* Prepare to unmap any existing mapping in the area */ if (vms_gather_munmap_vmas(&vms, &mas_detach)) return -ENOMEM; --=20 2.43.0