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Merge "BACKPORT: FROMLIST: mm: protect free_pgtables with mmap_lock write lock in exit_mmap"

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qctecmdr 2023-08-16 03:58:16 -07:00 • committed by Gerrit - the friendly Code Review server
commit d7bb68d35f
1 changed files with 7 additions and 7 deletions
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14
mm/mmap.c
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@ -3254,10 +3254,9 @@ void exit_mmap(struct mm_struct *mm)
(void)__oom_reap_task_mm(mm);
set_bit(MMF_OOM_SKIP, &mm->flags);
down_write(&mm->mmap_sem);
up_write(&mm->mmap_sem);
}
down_write(&mm->mmap_sem);
if (mm->locked_vm) {
vma = mm->mmap;
while (vma) {
@ -3270,8 +3269,11 @@ void exit_mmap(struct mm_struct *mm)
arch_exit_mmap(mm);
vma = mm->mmap;
if (!vma) /* Can happen if dup_mmap() received an OOM */
if (!vma) {
/* Can happen if dup_mmap() received an OOM */
up_write(&mm->mmap_sem);;
return;
}
lru_add_drain();
flush_cache_mm(mm);
@ -3282,16 +3284,14 @@ void exit_mmap(struct mm_struct *mm)
free_pgtables(&tlb, vma, FIRST_USER_ADDRESS, USER_PGTABLES_CEILING);
tlb_finish_mmu(&tlb, 0, -1);
/*
* Walk the list again, actually closing and freeing it,
* with preemption enabled, without holding any MM locks.
*/
/* Walk the list again, actually closing and freeing it. */
while (vma) {
if (vma->vm_flags & VM_ACCOUNT)
nr_accounted += vma_pages(vma);
vma = remove_vma(vma);
cond_resched();
}
up_write(&mm->mmap_sem);
vm_unacct_memory(nr_accounted);
}