From 6fa009794a45da49ee14a6dc056598ca39b6af1d Mon Sep 17 00:00:00 2001
From: Paul Adenot <paul@paul.cx>
Date: Tue, 21 Apr 2026 17:08:52 +0000
Subject: [PATCH] alsa: Add frame validation in stream_buffer_decrement

---
 src/cubeb_alsa.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/cubeb_alsa.c b/src/cubeb_alsa.c
index f114f27d7..be9faa490 100644
--- a/src/cubeb_alsa.c
+++ b/src/cubeb_alsa.c
@@ -294,6 +294,9 @@ set_timeout(struct timeval * timeout, unsigned int ms)
 static void
 stream_buffer_decrement(cubeb_stream * stm, long count)
 {
+  if (count < 0 || (snd_pcm_uframes_t)count > stm->bufframes) {
+    count = stm->bufframes;
+  }
   char * bufremains =
       stm->buffer + WRAP(snd_pcm_frames_to_bytes)(stm->pcm, count);
   memmove(stm->buffer, bufremains,