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Date: Wed, 02 Nov 2011 15:15:10 -0700
From: Greg KH <gregkh@...e.de>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
alan@...rguk.ukuu.org.uk, Hugh Dickins <hughd@...gle.com>
Subject: [104/107] vm: fix vm_pgoff wrap in upward expansion
2.6.32-longterm review patch. If anyone has any objections, please let us know.
------------------
From: Hugh Dickins <hughd@...gle.com>
commit 42c36f63ac1366ab0ecc2d5717821362c259f517 upstream.
Commit a626ca6a6564 ("vm: fix vm_pgoff wrap in stack expansion") fixed
the case of an expanding mapping causing vm_pgoff wrapping when you had
downward stack expansion. But there was another case where IA64 and
PA-RISC expand mappings: upward expansion.
This fixes that case too.
Signed-off-by: Hugh Dickins <hughd@...gle.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
mm/mmap.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1636,9 +1636,12 @@ int expand_upwards(struct vm_area_struct
size = address - vma->vm_start;
grow = (address - vma->vm_end) >> PAGE_SHIFT;
- error = acct_stack_growth(vma, size, grow);
- if (!error)
- vma->vm_end = address;
+ error = -ENOMEM;
+ if (vma->vm_pgoff + (size >> PAGE_SHIFT) >= vma->vm_pgoff) {
+ error = acct_stack_growth(vma, size, grow);
+ if (!error)
+ vma->vm_end = address;
+ }
}
anon_vma_unlock(vma);
return error;
--
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