From: Namhyung Kim <namhyung@gmail.com>
Date: Wed, 25 May 2011 00:11:26 +0000 (-0700)
Subject: mm: nommu: fix a potential memory leak in do_mmap_private()
X-Git-Tag: firefly_0821_release~7613^2~1279
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=7223bb4a829628bdf37d544ed4363d99bac1ade6;p=firefly-linux-kernel-4.4.55.git

mm: nommu: fix a potential memory leak in do_mmap_private()

If f_op->read() fails and sysctl_nr_trim_pages > 1, there could be a
memory leak between @region->vm_end and @region->vm_top.

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Acked-by: Greg Ungerer <gerg@uclinux.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/nommu.c b/mm/nommu.c
index 0563fd9003df..57ae6126b29a 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1217,7 +1217,7 @@ static int do_mmap_private(struct vm_area_struct *vma,
 	return 0;
 
 error_free:
-	free_page_series(region->vm_start, region->vm_end);
+	free_page_series(region->vm_start, region->vm_top);
 	region->vm_start = vma->vm_start = 0;
 	region->vm_end   = vma->vm_end = 0;
 	region->vm_top   = 0;