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Do not modify read-only RCU copy of routelist

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RCU reader returns a shared ptr to the current object which
can also be used in other places at the same time.

Sorting the shared-ptr list invalidates iterators which can
throw off other users of the same object.

This fixes a bug in PT-import which calls get_nth_audio_track().
This commit is contained in:
Robin Gareus 2023-04-07 19:37:30 +02:00
parent 979f9876a7
commit f3e13848fa
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1 changed files with 4 additions and 4 deletions
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8
libs/ardour/session.cc
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@ -6408,11 +6408,11 @@ Session::route_removed_from_route_group (RouteGroup* rg, std::weak_ptr<Route> r)
std::shared_ptr<AudioTrack> std::shared_ptr<AudioTrack>
Session::get_nth_audio_track (uint32_t nth) const Session::get_nth_audio_track (uint32_t nth) const
{ {
std::shared_ptr<RouteList> rl = routes.reader (); RouteList rl (*(routes.reader ()));
rl->sort (Stripable::Sorter ()); rl.sort (Stripable::Sorter());
for (RouteList::const_iterator r = rl->begin(); r != rl->end(); ++r) { for (auto const& r: rl) {
std::shared_ptr<AudioTrack> at = std::dynamic_pointer_cast<AudioTrack> (*r); std::shared_ptr<AudioTrack> at = std::dynamic_pointer_cast<AudioTrack> (r);
if (!at) { if (!at) {
continue; continue;
} }