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| author | Anthony Yznaga <anthony.yznaga@oracle.com> | 2023-08-30 02:45:49 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-10-04 19:32:19 +0200 |
| commit | 954652b9f33bb1892ea4448479d78779e4a8ae13 (patch) | |
| tree | b7119e1e28ece6003387bfe60f646d7ddf03277e /mm/mremap.c | |
| parent | selftests/mm: gup_longterm: fix a resource leak (diff) | |
| download | linux-954652b9f33bb1892ea4448479d78779e4a8ae13.tar.xz linux-954652b9f33bb1892ea4448479d78779e4a8ae13.zip | |
mm/mremap: fix unaccount of memory on vma_merge() failure
Fix mremap so that only accounted memory is unaccounted if the mapping is
expandable but vma_merge() fails.
Link: https://lkml.kernel.org/r/20230830004549.16131-1-anthony.yznaga@oracle.com
Fixes: fdbef6149135 ("mm/mremap: don't account pages in vma_to_resize()")
Signed-off-by: Anthony Yznaga <anthony.yznaga@oracle.com>
Acked-by: Brian Geffon <bgeffon@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/mremap.c')
| -rw-r--r-- | mm/mremap.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/mremap.c b/mm/mremap.c index 382e81c33fc4..fbb4861964f6 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; } |