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>
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