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mmap: call unlink_anon_vmas() in __split_vma() in case of error

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If __split_vma fails because of an out of memory condition the
anon_vma_chain isn't teardown and freed potentially leading to rmap walks
accessing freed vma information plus there's a memleak.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Johannes Weiner <jweiner@redhat.com>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrea Arcangeli 2010-09-22 13:05:12 -07:00 • committed by Linus Torvalds
parent a247c3a97a
commit 2aeadc30de
1 changed files with 1 additions and 0 deletions
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mm/mmap.c
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@ -2009,6 +2009,7 @@ static int __split_vma(struct mm_struct * mm, struct vm_area_struct * vma,
removed_exe_file_vma(mm);
fput(new->vm_file);
}
unlink_anon_vmas(new);
out_free_mpol:
mpol_put(pol);
out_free_vma: