diff options
| author | Helge Deller <deller@gmx.de> | 2006-12-19 19:28:33 +0100 |
|---|---|---|
| committer | Kyle McMartin <kyle@minerva.i.cabal.ca> | 2007-06-21 23:46:20 +0200 |
| commit | 06b32f3ab6df4c7489729f94bdc7093c72681d4b (patch) | |
| tree | 07fabea840fa598e510b4da899ef7f5b06282683 /mm/mmap.c | |
| parent | [PARISC] stop lcd driver from stripping initial whitespace (diff) | |
| download | linux-06b32f3ab6df4c7489729f94bdc7093c72681d4b.tar.xz linux-06b32f3ab6df4c7489729f94bdc7093c72681d4b.zip | |
[PARISC] Handle wrapping in expand_upwards()
Function expand_upwards() did not guarded against wrapping
around to address 0. This fixes the adjtimex02 testcase from
the Linux Test Project on a 32bit PARISC kernel.
[expand_upwards is only used on parisc and ia64; it looks like it does
the right thing on both. --kyle]
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: Tony Luck <tony.luck@intel.com>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
Diffstat (limited to 'mm/mmap.c')
| -rw-r--r-- | mm/mmap.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 68b9ad2ef1d6..906ed402f7ca 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1536,9 +1536,14 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address) * vma->vm_start/vm_end cannot change under us because the caller * is required to hold the mmap_sem in read mode. We need the * anon_vma lock to serialize against concurrent expand_stacks. + * Also guard against wrapping around to address 0. */ - address += 4 + PAGE_SIZE - 1; - address &= PAGE_MASK; + if (address < PAGE_ALIGN(address+4)) + address = PAGE_ALIGN(address+4); + else { + anon_vma_unlock(vma); + return -ENOMEM; + } error = 0; /* Somebody else might have raced and expanded it already */ |