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audioconvert: sync filter-graphs out of data loop before forced rebuild

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A forced setup_filter_graphs() deactivates and re-instantiates every graph,
which frees and recreates the underlying plugin handles (node_cleanup sets
node->hndl[i] = NULL before re-instantiating). This was done on a graph that
was still referenced by the RT data-loop snapshot (filter_graph[]), so the
RT thread could run a graph whose handles were NULL mid-rebuild, leading to a
NULL handle dereference in the filter-graph process path.

Mirror the safe ordering already used by load_filter_graph()/clean_filter_handles():
before reconfiguring, mark the graphs not-setup and sync_filter_graph() so the
data loop drops them from filter_graph[] under the loop lock. They are
republished by the sync that follows setup. The cheap snapshot swap is done
under the lock; the heavy re-instantiation stays off the RT path.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
This commit is contained in:
Torkel Niklasson 2026-06-27 11:15:44 +02:00 • committed by Wim Taymans
parent 10b339bbf8
commit f174b4e688
1 changed files with 16 additions and 0 deletions
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16
spa/plugins/audioconvert/audioconvert.c
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@ -1368,6 +1368,8 @@ static int ensure_tmp(struct impl *this)
}
static void sync_filter_graph(struct impl *impl);
static int setup_filter_graphs(struct impl *impl, bool force)
{
int res;
@ -1382,6 +1384,20 @@ static int setup_filter_graphs(struct impl *impl, bool force)
position = in->format.info.raw.position;
impl->maxports = SPA_MAX(in->format.info.raw.channels, out->format.info.raw.channels);
if (force) {
/* A forced setup deactivates and re-instantiates each graph below,
* which frees and recreates the underlying plugin handles. Pull the
* graphs out of the data-loop's view first (under the loop lock, via
* sync_filter_graph) so the RT thread cannot run a graph while its
* handles are NULL during the rebuild. They are republished by the
* sync_filter_graph() that follows setup. */
spa_list_for_each(g, &impl->active_graphs, link) {
if (!g->removing)
g->setup = false;
}
sync_filter_graph(impl);
}
spa_list_for_each_safe(g, t, &impl->active_graphs, link) {
if (g->removing)
continue;