From 120e063a102e1cf8d92a3ecd0f3e0372d3d628cb Mon Sep 17 00:00:00 2001
From: Geoffrey McRae <geoff@hostfission.com>
Date: Sat, 11 Nov 2023 13:13:08 +1100
Subject: [PATCH] [client] main: prevent possible null pointer dereference

---
 client/src/main.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/client/src/main.c b/client/src/main.c
index 07958da8..b984fbc0 100644
--- a/client/src/main.c
+++ b/client/src/main.c
@@ -761,6 +761,13 @@ int main_frameThread(void * unused)
           }
         }
 
+      if (!dma)
+      {
+        DEBUG_ERROR("Failed to obtain a free DMA buffer for use");
+        g_state.state = APP_STATE_SHUTDOWN;
+        break;
+      }
+
       /* open the buffer */
       if (dma->fd == -1)
       {