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mmap: check ->vm_ops before dereferencing 

Check whether the VMA has a vm_ops before calling close, just
like we check vm_ops before calling open a few dozen lines
higher up in the function.

Signed-off-by: Rik van Riel <riel@redhat.com>
Reported-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rik van Riel 2010-04-26 12:33:03 -04:00 committed by Linus Torvalds
parent a231a1f271
commit 5892753383
1 changed files with 2 additions and 1 deletions
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mm/mmap.c
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@ -1977,6 +1977,7 @@ static int __split_vma(struct mm_struct * mm, struct vm_area_struct * vma,
return 0; return 0;
/* Clean everything up if vma_adjust failed. */ /* Clean everything up if vma_adjust failed. */
if (new->vm_ops && new->vm_ops->close)
new->vm_ops->close(new); new->vm_ops->close(new);
if (new->vm_file) { if (new->vm_file) {
if (vma->vm_flags & VM_EXECUTABLE) if (vma->vm_flags & VM_EXECUTABLE)