From b5e63ca44c846813ece9ad9df684cae0d1d5b542 Mon Sep 17 00:00:00 2001
From: Mike Ajax <14773392+michaelajax@users.noreply.github.com>
Date: Thu, 23 Apr 2026 22:00:53 -0700
Subject: typec/stm32: guard hard reset RX re-arm against uninitialized buffer

---
 src/portable/st/typec/typec_stm32.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/portable/st/typec/typec_stm32.c b/src/portable/st/typec/typec_stm32.c
index fe9275245..d7e622925 100644
--- a/src/portable/st/typec/typec_stm32.c
+++ b/src/portable/st/typec/typec_stm32.c
@@ -342,8 +342,10 @@ void tcd_int_handler(uint8_t rhport) {
   // flag will remain set and re-enter the ISR immediately
   if (sr & UCPD_SR_RXHRSTDET) {
     TU_LOG3("Hard Reset received\r\n");
-    dma_stop(rhport, true);
-    tcd_msg_receive(rhport, _rx_buf, _rx_buf_len);
+    if (_rx_buf != NULL && _rx_buf_len > 0) {
+      dma_stop(rhport, true);
+      tcd_msg_receive(rhport, _rx_buf, _rx_buf_len);
+    }
     UCPD1->ICR = UCPD_ICR_RXHRSTDETCF;
   }
 
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