diff options
| author | Hugh Dickins <hughd@google.com> | 2011-05-09 17:44:42 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-11-07 12:32:50 -0800 |
| commit | dbb6e675314ddf4f1011a080e2fee0012134f83f (patch) | |
| tree | 7c0a01b789a95831f90537b0e26178f2c6e602c3 | |
| parent | c1bf02fadd5bbd27c6ba3a8de4c8cdc0e36231e7 (diff) | |
| download | lwn-dbb6e675314ddf4f1011a080e2fee0012134f83f.tar.gz lwn-dbb6e675314ddf4f1011a080e2fee0012134f83f.zip | |
vm: fix vm_pgoff wrap in upward expansion
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@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | mm/mmap.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 537b36584e9a..4b80cbfd6c46 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1636,9 +1636,12 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address) 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; |