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| author | Nick Piggin <npiggin@suse.de> | 2007-03-16 13:38:10 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-03-16 19:25:04 -0700 |
| commit | 00e9fa2d6421fbbefb4c02821a1e779a3ce47781 (patch) | |
| tree | d5b57449b693f24ee106af062ca8c6bfcef6d1e7 | |
| parent | 0465fc0a1c42e18438d391f3a7e661493a9ad68e (diff) | |
| download | linux-00e9fa2d6421fbbefb4c02821a1e779a3ce47781.tar.gz linux-00e9fa2d6421fbbefb4c02821a1e779a3ce47781.tar.bz2 linux-00e9fa2d6421fbbefb4c02821a1e779a3ce47781.zip | |
[PATCH] 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>
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Acked-by: Hugh Dickins <hugh@veritas.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -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: |