transport: deep-copy object-filter struct for fetch-pack

When the transport code for the git protocol calls into fetch_pack(), it
has to fill out a fetch_pack_args struct that is mostly taken from the
transport options. We pass along any object-filter data by doing a
struct assignment of the list_objects_filter_options struct. But doing
so isn't safe; it contains allocated pointers in its filter_spec
string_list, which could lead to a double-free if one side mutates or
frees the string_list.

And indeed, the fetch-pack code does clear and rewrite the list via
expand_list_objects_filter_spec(), leaving the transport code with
dangling pointers.

This hasn't been a problem so far, though, because the transport code
doesn't look further at the filter struct. But it should, because in
some cases (when fetch-pack doesn't rewrite the list), it ends up
leaking the string_list.

So let's start by turning this shallow copy into a deep one, which
should let us fix the transport leak in a subsequent patch. Likewise,
we'll free the deep copy we made here when we're done with it (to avoid
leaking).

Note that it would also work to pass fetch-pack a pointer to our filter
struct, rather than a copy. But it's awkward for fetch-pack to take a
pointer in its arg struct; the actual git-fetch-pack command allocates a
fetch_pack_args struct on the stack and expects it to contain the filter
options. It could be rewritten to avoid this, but a deep copy serves our
purposes just as well.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

transport.c

@@ -386,7 +386,8 @@ static int fetch_refs_via_pack(struct transport *transport,
 	args.cloning = transport->cloning;
 	args.update_shallow = data->options.update_shallow;
 	args.from_promisor = data->options.from_promisor;
-	args.filter_options = data->options.filter_options;
+	list_objects_filter_copy(&args.filter_options,
+				 &data->options.filter_options);
 	args.refetch = data->options.refetch;
 	args.stateless_rpc = transport->stateless_rpc;
 	args.server_options = transport->server_options;
@@ -453,6 +454,7 @@ cleanup:
 
 	free_refs(refs_tmp);
 	free_refs(refs);
+	list_objects_filter_release(&args.filter_options);
 	return ret;
 }