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tree-walk.c: do not leak internal structure in tree_entry_len()
tree_entry_len() does not simply take two random arguments and return a tree length. The two pointers must point to a tree item structure, or struct name_entry. Passing random pointers will return incorrect value. Force callers to pass struct name_entry instead of two pointers (with hope that they don't manually construct struct name_entry themselves) Signed-off-by: Nguyễn Thái Ngọc Duy <email@example.com> Signed-off-by: Junio C Hamano <firstname.lastname@example.org>
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