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mm/mremap: do not set vrm->vma NULL immediately prior to checking it

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This seems rather unwise.  If we cannot merge, extend, then we need to
recall the original VMA to see if we need to uncharge.

If we do need to, do so.

Link: https://lkml.kernel.org/r/b2fb6b9c-376d-4e9b-905e-26d847fd3865@lucifer.local
Fixes: d5c8aec0542e ("mm/mremap: initial refactor of move_vma()")
Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reported-=by: "Lai, Yi" <yi1.lai@linux.intel.com>
Closes: https://lore.kernel.org/linux-mm/Z+lcvEIHMLiKVR1i@ly-workstation/
Cc: Liam R. Howlett <Liam.Howlett@Oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Harry Yoo <harry.yoo@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Lorenzo Stoakes 2025-03-30 17:20:48 +01:00 committed by Andrew Morton
parent 25601e8544
commit 36eed54008
1 changed files with 2 additions and 1 deletions
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3
mm/mremap.c
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@ -1561,11 +1561,12 @@ static unsigned long expand_vma_in_place(struct vma_remap_struct *vrm)
* adjacent to the expanded vma and otherwise
* compatible.
*/
vma = vrm->vma = vma_merge_extend(&vmi, vma, vrm->delta);
vma = vma_merge_extend(&vmi, vma, vrm->delta);
if (!vma) {
vrm_uncharge(vrm);
return -ENOMEM;
}
vrm->vma = vma;
vrm_stat_account(vrm, vrm->delta);