[pulseaudio-discuss] [PATCH] filter-apply: Ignore monitor source of filter in find_paired_master()

[Georg Chini]

When module-filter-apply tries to find a matching source-output for
a given sink-input and a stream with the same role exists on the
monitor source of the filter, module-filter apply falsely assumes
that the source belongs to another instance of the filter and tries
to access source->output_from_master->source, which leads to a
segmentation fault.

This patch fixes the issue by ignoring the stream if the source is
the monitor source of the filter.

Bug link: https://bugs.freedesktop.org/show_bug.cgi?id=104958
---
 src/modules/module-filter-apply.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/modules/module-filter-apply.c b/src/modules/module-filter-apply.c
index 783d85ed..163d52a2 100644
--- a/src/modules/module-filter-apply.c
+++ b/src/modules/module-filter-apply.c
@@ -259,6 +259,12 @@ static bool find_paired_master(struct userdata *u, struct filter *filter, pa_obj
 
                 if (pa_streq(g, group)) {
                     if (pa_streq(module_name, so->source->module->name)) {
+                        /* Make sure we are not routing to the monitor source
+                         * of the same filter */
+                        if (so->source->monitor_of) {
+                            pa_xfree(g);
+                            continue;
+                        }
                         /* Make sure we're not routing to another instance of
                          * the same filter. */
                         filter->source_master = so->source->output_from_master->source;
-- 
2.14.1