pipewire/0001-alsa-guard-against-some-invalid-values.patch

From 32a7c85c84e419636109eb5db127292e25462a38 Mon Sep 17 00:00:00 2001
From: Wim Taymans <wtaymans@redhat.com>
Date: Mon, 16 Jan 2023 16:05:17 +0100
Subject: [PATCH] alsa: guard against some invalid values

Avoid division by 0 and other strange things when invalid values
are detected.

Fixes #2953
---
 spa/plugins/alsa/alsa-pcm.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/spa/plugins/alsa/alsa-pcm.c b/spa/plugins/alsa/alsa-pcm.c
index 76fe433b8..08b9ceddd 100644
--- a/spa/plugins/alsa/alsa-pcm.c
+++ b/spa/plugins/alsa/alsa-pcm.c
@@ -1519,6 +1519,11 @@ int spa_alsa_set_format(struct state *state, struct spa_audio_info *fmt, uint32_
 		fmt->info.raw.rate = rrate;
 		match = false;
 	}
+	if (rchannels == 0 || rrate == 0) {
+		spa_log_error(state->log, "%s: invalid channels:%d or rate:%d",
+				state->props.device, rchannels, rrate);
+		return -EIO;
+	}
 
 	state->format = rformat;
 	state->channels = rchannels;
@@ -1563,6 +1568,11 @@ int spa_alsa_set_format(struct state *state, struct spa_audio_info *fmt, uint32_
 
 	CHECK(snd_pcm_hw_params_set_period_size_near(hndl, params, &period_size, &dir), "set_period_size_near");
 
+	if (period_size == 0) {
+		spa_log_error(state->log, "%s: invalid period_size 0 (driver error?)", state->props.device);
+		return -EIO;
+	}
+
 	state->period_frames = period_size;
 
 	if (state->default_period_num != 0) {
@@ -1578,6 +1588,10 @@ int spa_alsa_set_format(struct state *state, struct spa_audio_info *fmt, uint32_
 		CHECK(snd_pcm_hw_params_set_buffer_size_near(hndl, params, &state->buffer_frames), "set_buffer_size_near");
 		periods = state->buffer_frames / period_size;
 	}
+	if (state->buffer_frames == 0) {
+		spa_log_error(state->log, "%s: invalid buffer_frames 0 (driver error?)", state->props.device);
+		return -EIO;
+	}
 
 	state->headroom = state->default_headroom;
 	if (is_batch)
@@ -2542,6 +2556,14 @@ int spa_alsa_start(struct state *state)
 		state->duration = 1024;
 		state->rate_denom = state->rate;
 	}
+	if (state->rate_denom == 0) {
+		spa_log_error(state->log, "%s: unset rate_denom", state->props.device);
+		return -EIO;
+	}
+	if (state->duration == 0) {
+		spa_log_error(state->log, "%s: unset duration", state->props.device);
+		return -EIO;
+	}
 
 	state->following = is_following(state);
 	setup_matching(state);
-- 
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