This is a note to let you know that I've just added the patch titled mm/mmap.c: fix missing call to vm_unacct_memory in mmap_region to the 5.18-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mm-mmap.c-fix-missing-call-to-vm_unacct_memory-in-mm.patch and it can be found in the queue-5.18 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 376f96975ca5b062778dcafb7ca9734b08dbc9d9 Author: Miaohe Lin <linmiaohe@xxxxxxxxxx> Date: Sat Jun 18 16:20:27 2022 +0800 mm/mmap.c: fix missing call to vm_unacct_memory in mmap_region [ Upstream commit 7f82f922319ede486540e8746769865b9508d2c2 ] Since the beginning, charged is set to 0 to avoid calling vm_unacct_memory twice because vm_unacct_memory will be called by above unmap_region. But since commit 4f74d2c8e827 ("vm: remove 'nr_accounted' calculations from the unmap_vmas() interfaces"), unmap_region doesn't call vm_unacct_memory anymore. So charged shouldn't be set to 0 now otherwise the calling to paired vm_unacct_memory will be missed and leads to imbalanced account. Link: https://lkml.kernel.org/r/20220618082027.43391-1-linmiaohe@xxxxxxxxxx Fixes: 4f74d2c8e827 ("vm: remove 'nr_accounted' calculations from the unmap_vmas() interfaces") Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/mm/mmap.c b/mm/mmap.c index 313b57d55a63..6d9bfd9c94ca 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1882,7 +1882,6 @@ unsigned long mmap_region(struct file *file, unsigned long addr, /* Undo any partial mapping done by a device driver. */ unmap_region(mm, vma, prev, vma->vm_start, vma->vm_end); - charged = 0; if (vm_flags & VM_SHARED) mapping_unmap_writable(file->f_mapping); free_vma: