[PATCH] mm/mremap: fix unaccount of memory on vma_merge() failure

[Anthony Yznaga <anthony.yznaga@oracle.com>]

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