Andrew,

Just in case you didn't notice, this patch was reviewed on another list.

Thanks, Liam

* Hajime Tazaki thehajime@gmail.com [241108 17:29]:

When deleting a vma entry from a maple tree, it has to pass NULL to vma_iter_prealloc() in order to calculate internal state of the tree, but it passed a wrong argument. As a result, nommu kernels crashed upon accessing a vma iterator, such as acct_collect() reading the size of vma entries after do_munmap().

This commit fixes this issue by passing a right argument to the preallocation call.

Fixes: b5df09226450 ("mm: set up vma iterator for vma_iter_prealloc() calls") Cc: stable@vger.kernel.org Reviewed-by: Liam R. Howlett Liam.Howlett@Oracle.com Signed-off-by: Hajime Tazaki thehajime@gmail.com

---

mm/nommu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/nommu.c b/mm/nommu.c index 385b0c15add8..0c708f85408d 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -573,7 +573,7 @@ static int delete_vma_from_mm(struct vm_area_struct *vma) VMA_ITERATOR(vmi, vma->vm_mm, vma->vm_start); vma_iter_config(&vmi, vma->vm_start, vma->vm_end);

• if (vma_iter_prealloc(&vmi, vma)) {

• if (vma_iter_prealloc(&vmi, NULL)) { pr_warn("Allocation of vma tree for process %d failed\n", current->pid); return -ENOMEM;

-- 2.43.0