From 0263cfc01ab63d6799e80cbbf691af1979cf3ab7 Mon Sep 17 00:00:00 2001
From: rppicomidi <rppicomidi@gmail.com>
Date: Sat, 6 Sep 2025 06:58:35 -0700
Subject: [PATCH] fix #3239: discard poorly formed packets

---
 src/class/midi/midi_host.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/class/midi/midi_host.c b/src/class/midi/midi_host.c
index 50bda1e36..e6ace316c 100644
--- a/src/class/midi/midi_host.c
+++ b/src/class/midi/midi_host.c
@@ -575,6 +575,11 @@ uint32_t tuh_midi_stream_read(uint8_t idx, uint8_t *p_cable_num, uint8_t *p_buff
             }
           }
         }
+        else {
+          // bad packet discard
+          nread = tu_edpt_stream_read(p_midi->daddr, &p_midi->ep_stream.rx, p_midi->stream_read.buffer, 4);
+          continue;
+        }
       } else if (status < MIDI_STATUS_SYSEX_START) {
         // then it is a channel message either three bytes or two
         uint8_t fake_cin = (status & 0xf0) >> 4;
@@ -617,6 +622,11 @@ uint32_t tuh_midi_stream_read(uint8_t idx, uint8_t *p_cable_num, uint8_t *p_buff
         bytes_to_add_to_stream = 1;
       }
     }
+    else {
+      // bad packet discard
+      nread = tu_edpt_stream_read(p_midi->daddr, &p_midi->ep_stream.rx, p_midi->stream_read.buffer, 4);
+      continue;
+    }
 
     for (uint8_t i = 1; i <= bytes_to_add_to_stream; i++) {
       *p_buffer++ = p_midi->stream_read.buffer[i];