Re: [PATCH v1] mm/mempolicy: fix migrate_to_node() assuming there is at least one VMA in a MM

On Wed, 20 Nov 2024 15:27:46 -0500 "Liam R. Howlett" Liam.Howlett@oracle.com wrote:

I hate the extra check because syzbot can cause this as this should basically never happen in real life, but it seems we have to add it.

So..

--- a/mm/mempolicy.c~mm-mempolicy-fix-migrate_to_node-assuming-there-is-at-least-one-vma-in-a-mm-fix +++ a/mm/mempolicy.c @@ -1080,7 +1080,7 @@ static long migrate_to_node(struct mm_st

mmap_read_lock(mm); vma = find_vma(mm, 0); - if (!vma) { + if (unlikely(!vma)) { mmap_read_unlock(mm); return 0; } _

?