From: Rik van Riel <riel@redhat.com>
Date: Mon, 5 Apr 2010 16:13:33 +0000 (-0400)
Subject: rmap: fix anon_vma_fork() memory leak
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=4946d54cb55e86a156216fcfeed5568514b0830f;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

rmap: fix anon_vma_fork() memory leak

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.

This bug also has the potential to leave behind anon_vma_chain structs
with pointers to invalid memory.

Reported-by: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/rmap.c b/mm/rmap.c
index fcd593c9c997..eaa7a09eb72e 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -232,6 +232,7 @@ int anon_vma_fork(struct vm_area_struct *vma, struct vm_area_struct *pvma)
  out_error_free_anon_vma:
 	anon_vma_free(anon_vma);
  out_error:
+	unlink_anon_vmas(vma);
 	return -ENOMEM;
 }