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Subject[PATCH] mm/mremap: fix unaccount of memory on vma_merge() failure
Date
Fix mremap so that only accounted memory is unaccounted if the
mapping is expandable but vma_merge() fails.

Fixes: fdbef6149135 ("mm/mremap: don't account pages in vma_to_resize()")
Signed-off-by: Anthony Yznaga <anthony.yznaga@oracle.com>
---
mm/mremap.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/mremap.c b/mm/mremap.c
index 056478c106ee..07cdb04d4ab5 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -1037,12 +1037,14 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
pgoff_t extension_pgoff = vma->vm_pgoff +
((extension_start - vma->vm_start) >> PAGE_SHIFT);
VMA_ITERATOR(vmi, mm, extension_start);
+ long charged = 0;

if (vma->vm_flags & VM_ACCOUNT) {
if (security_vm_enough_memory_mm(mm, pages)) {
ret = -ENOMEM;
goto out;
}
+ charged = pages;
}

/*
@@ -1058,7 +1060,7 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
vma->vm_file, extension_pgoff, vma_policy(vma),
vma->vm_userfaultfd_ctx, anon_vma_name(vma));
if (!vma) {
- vm_unacct_memory(pages);
+ vm_unacct_memory(charged);
ret = -ENOMEM;
goto out;
}
--
2.39.3
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