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H A D | mmap.c | diff 824135c46b00df7fb369ec7f1f8607427bbebeb0 Fri Sep 29 20:30:40 CEST 2023 Liam R. Howlett <Liam.Howlett@oracle.com> mmap: fix error paths with dup_anon_vma()
When the calling function fails after the dup_anon_vma(), the duplication of the anon_vma is not being undone. Add the necessary unlink_anon_vma() call to the error paths that are missing them.
This issue showed up during inspection of the error path in vma_merge() for an unrelated vma iterator issue.
Users may experience increased memory usage, which may be problematic as the failure would likely be caused by a low memory situation.
Link: https://lkml.kernel.org/r/20230929183041.2835469-3-Liam.Howlett@oracle.com Fixes: d4af56c5c7c6 ("mm: start tracking VMAs with maple tree") Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com> Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Jann Horn <jannh@google.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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