From 82ec47898e77dca94a7d73e976363f745081d828 Mon Sep 17 00:00:00 2001 From: Tanu Kaskinen Date: Sat, 7 Feb 2015 00:15:34 +0200 Subject: [PATCH] alsa: Don't try to use ELD controls with UCM This fixes a crash that occurred when trying to access non-existent port data. Doing this: pa_alsa_port_data *data = PA_DEVICE_PORT_DATA(port); is not a good idea when using UCM, because in the UCM mode ports don't have any data, so the data pointer points to some random memory. --- src/modules/alsa/module-alsa-card.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/src/modules/alsa/module-alsa-card.c b/src/modules/alsa/module-alsa-card.c index df04155..a7fec04 100644 --- a/src/modules/alsa/module-alsa-card.c +++ b/src/modules/alsa/module-alsa-card.c @@ -455,6 +455,12 @@ static void init_eld_ctls(struct userdata *u) { if (!u->mixer_handle) return; + /* The code in this function expects ports to have a pa_alsa_port_data + * struct as their data, but in UCM mode ports don't have any data. Hence, + * the ELD controls can't currently be used in UCM mode. */ + if (u->use_ucm) + return; + PA_HASHMAP_FOREACH(port, u->card->ports, state) { pa_alsa_port_data *data = PA_DEVICE_PORT_DATA(port); snd_mixer_elem_t* melem; -- 2.7.4