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| author | John Stultz <john.stultz@linaro.org> | 2011-04-18 13:19:07 -0700 |
|---|---|---|
| committer | John Stultz <john.stultz@linaro.org> | 2011-04-18 13:19:07 -0700 |
| commit | 775d71e49c65f1f6aa57776ea1da62988fc9a30a (patch) | |
| tree | ce03cae544bacc8dda67422fd66a543dd1ae3c99 /mm/mremap.c | |
| parent | 18e82d2b952ab57fc1c8a69d4fa14e562f2aecf6 (diff) | |
| parent | c1a952f48517b5545075d8eb1a5d543099bd2ae1 (diff) | |
Merge branch 'upstream/linaro.38' into linaro-android.38KNOWN_GOOD
Diffstat (limited to 'mm/mremap.c')
| -rw-r--r-- | mm/mremap.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/mm/mremap.c b/mm/mremap.c index 1de98d492dd..a7c1f9f9b94 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -277,9 +277,16 @@ static struct vm_area_struct *vma_to_resize(unsigned long addr, if (old_len > vma->vm_end - addr) goto Efault; - if (vma->vm_flags & (VM_DONTEXPAND | VM_PFNMAP)) { - if (new_len > old_len) + /* Need to be careful about a growing mapping */ + if (new_len > old_len) { + unsigned long pgoff; + + if (vma->vm_flags & (VM_DONTEXPAND | VM_PFNMAP)) goto Efault; + pgoff = (addr - vma->vm_start) >> PAGE_SHIFT; + pgoff += vma->vm_pgoff; + if (pgoff + (new_len >> PAGE_SHIFT) < pgoff) + goto Einval; } if (vma->vm_flags & VM_LOCKED) { |