Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.10 353/545] mm/mmap.c: fix missing call to vm_unacct_memory in mmap_region | Date | Fri, 19 Aug 2022 17:42:03 +0200 |
| |
From: Miaohe Lin <linmiaohe@huawei.com>
[ 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@huawei.com Fixes: 4f74d2c8e827 ("vm: remove 'nr_accounted' calculations from the unmap_vmas() interfaces") Signed-off-by: Miaohe Lin <linmiaohe@huawei.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- mm/mmap.c | 1 - 1 file changed, 1 deletion(-)
diff --git a/mm/mmap.c b/mm/mmap.c index 102f73ed4b1b..a50042918cc7 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1902,7 +1902,6 @@ 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); allow_write_and_free_vma: -- 2.35.1
| |