The patch titled Subject: nommu: pass NULL argument to vma_iter_prealloc() has been added to the -mm mm-hotfixes-unstable branch. Its filename is nommu-pass-null-argument-to-vma_iter_prealloc.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: Hajime Tazaki thehajime@gmail.com Subject: nommu: pass NULL argument to vma_iter_prealloc() Date: Sat, 9 Nov 2024 07:28:34 +0900

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.

Link: https://lkml.kernel.org/r/20241108222834.3625217-1-thehajime@gmail.com Fixes: b5df09226450 ("mm: set up vma iterator for vma_iter_prealloc() calls") Signed-off-by: Hajime Tazaki thehajime@gmail.com Reviewed-by: Liam R. Howlett Liam.Howlett@Oracle.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

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

--- a/mm/nommu.c~nommu-pass-null-argument-to-vma_iter_prealloc +++ a/mm/nommu.c @@ -573,7 +573,7 @@ static int delete_vma_from_mm(struct vm_ 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; _

Patches currently in -mm which might be from thehajime@gmail.com are

nommu-pass-null-argument-to-vma_iter_prealloc.patch