A memory leak is possible in the race and error path in both expand_downwards() and expand_upwards() due to the maple tree preallocations. Fix these by always destroying the maple state. Fixes: a760774e7b7b (mm: start tracking VMAs with maple tree) Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx> --- mm/mmap.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/mmap.c b/mm/mmap.c index c147d2b5550b..ebfd71a79814 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2047,6 +2047,7 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address) } anon_vma_unlock_write(vma->anon_vma); khugepaged_enter_vma_merge(vma, vma->vm_flags); + mas_destroy(&mas); return error; } #endif /* CONFIG_STACK_GROWSUP || CONFIG_IA64 */ @@ -2128,6 +2129,7 @@ int expand_downwards(struct vm_area_struct *vma, unsigned long address) } anon_vma_unlock_write(vma->anon_vma); khugepaged_enter_vma_merge(vma, vma->vm_flags); + mas_destroy(&mas); return error; } -- 2.35.1
