[PATCH] rmap: fix anon_vma_fork() memory leak

[Rik van Riel]

Fix a memory leak in anon_vma_fork(), where we fail to tear down the
anon_vmas attached to the new VMA in case setting up the new anon_vma
fails.

Reported-by: Minchan Kim <minchan.kim@xxxxxxxxx>
Signed-off-by: Rik van Riel <riel@xxxxxxxxxx>

diff --git a/mm/rmap.c b/mm/rmap.c
index fcd593c..fb7ce99 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -231,6 +231,7 @@ int anon_vma_fork(struct vm_area_struct *vma, struct vm_area_struct *pvma)
 
  out_error_free_anon_vma:
 	anon_vma_free(anon_vma);
+	unlink_anon_vmas(vma);
  out_error:
 	return -ENOMEM;
 }

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