From f60bbb423920aff969662f47d92c00b25e7c8cb5 Mon Sep 17 00:00:00 2001 From: "Liam R. Howlett" Date: Thu, 21 Apr 2022 17:41:19 -0400 Subject: [PATCH] mm/mmap.c: Fix mmap_write_lock() order in exit_mmap() for oom Signed-off-by: Liam R. Howlett --- mm/mmap.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index 01dd9af0b13e..1d9d88d52390 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -3114,6 +3114,7 @@ void exit_mmap(struct mm_struct *mm) /* mm's last user has gone, and its about to be pulled down */ mmu_notifier_release(mm); + mmap_write_lock(mm); if (unlikely(mm_is_oom_victim(mm))) { /* * Manually reap the mm to free as much memory as possible. @@ -3131,9 +3132,7 @@ void exit_mmap(struct mm_struct *mm) set_bit(MMF_OOM_SKIP, &mm->flags); } - mmap_write_lock(mm); arch_exit_mmap(mm); - vma = mas_find(&mas, ULONG_MAX); if (!vma) { /* Can happen if dup_mmap() received an OOM */ -- 2.50.1