Re: [PATCH v3 2/3] mmap: Fix error paths with dup_anon_vma()

On 9/29/23 20:30, Liam R. Howlett wrote:

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.

Fixes: d4af56c5c7c6 ("mm: start tracking VMAs with maple tree") Cc: stable@vger.kernel.org Cc: Jann Horn jannh@google.com Signed-off-by: Liam R. Howlett Liam.Howlett@oracle.com

Acked-by: Vlastimil Babka vbabka@suse.cz