diff options
author | Ingo Molnar <mingo@elte.hu> | 2010-10-08 09:14:51 +0200 |
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committer | Ingo Molnar <mingo@elte.hu> | 2010-10-08 09:15:00 +0200 |
commit | 153db80f8cf74e8700cac96305b6c0b92918f17c (patch) | |
tree | c2afb28e7b3f4fbf0aacd9edd39d7f895321ca0c /mm/fremap.c | |
parent | 5fd03ddab7fdbc44bfb2d183a4531c26a8dbca5a (diff) | |
parent | cb655d0f3d57c23db51b981648e452988c0223f9 (diff) |
Merge commit 'v2.6.36-rc7' into core/memblock
Merge reason: Update from -rc3 to -rc7.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'mm/fremap.c')
-rw-r--r-- | mm/fremap.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/mm/fremap.c b/mm/fremap.c index 46f5dacf90a..ec520c7b28d 100644 --- a/mm/fremap.c +++ b/mm/fremap.c @@ -125,7 +125,6 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size, { struct mm_struct *mm = current->mm; struct address_space *mapping; - unsigned long end = start + size; struct vm_area_struct *vma; int err = -EINVAL; int has_write_lock = 0; @@ -142,6 +141,10 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size, if (start + size <= start) return err; + /* Does pgoff wrap? */ + if (pgoff + (size >> PAGE_SHIFT) < pgoff) + return err; + /* Can we represent this offset inside this architecture's pte's? */ #if PTE_FILE_MAX_BITS < BITS_PER_LONG if (pgoff + (size >> PAGE_SHIFT) >= (1UL << PTE_FILE_MAX_BITS)) @@ -168,7 +171,7 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size, if (!(vma->vm_flags & VM_CAN_NONLINEAR)) goto out; - if (end <= start || start < vma->vm_start || end > vma->vm_end) + if (start < vma->vm_start || start + size > vma->vm_end) goto out; /* Must set VM_NONLINEAR before any pages are populated. */ |