diff options
| author | Nick Piggin <npiggin@suse.de> | 2007-03-28 21:29:38 +0200 |
|---|---|---|
| committer | Adrian Bunk <bunk@stusta.de> | 2007-03-28 21:29:38 +0200 |
| commit | 921e8ebfc8b0e41dc724ea52f4b95b7c44f6e880 (patch) | |
| tree | fd6779c379ac22493f2016d402e0f38bd4dc3aa4 | |
| parent | ef1136fb7497e0ad6b419add0b463c9a770c42ee (diff) | |
mm: fix madvise infinine loop
madvise(MADV_REMOVE) can go into an infinite loop or cause an oops if the
call covers a region from the start of a vma, and extending past that vma.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Acked-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
| -rw-r--r-- | mm/madvise.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/mm/madvise.c b/mm/madvise.c index 4e196155a0c3..77916e9fc52b 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -155,11 +155,14 @@ static long madvise_dontneed(struct vm_area_struct * vma, * Other filesystems return -ENOSYS. */ static long madvise_remove(struct vm_area_struct *vma, + struct vm_area_struct **prev, unsigned long start, unsigned long end) { struct address_space *mapping; loff_t offset, endoff; + *prev = vma; + if (vma->vm_flags & (VM_LOCKED|VM_NONLINEAR|VM_HUGETLB)) return -EINVAL; @@ -199,7 +202,7 @@ madvise_vma(struct vm_area_struct *vma, struct vm_area_struct **prev, error = madvise_behavior(vma, prev, start, end, behavior); break; case MADV_REMOVE: - error = madvise_remove(vma, start, end); + error = madvise_remove(vma, prev, start, end); break; case MADV_WILLNEED: |