From: Masamichi Hosoda <trueroad@trueroad.jp>
Date: Thu, 30 Jun 2016 14:22:55 +0000 (+0900)
Subject: Issue 4910/3: Avoid crash when g_spawn_sync () fails
X-Git-Url: https://git.donarmstrong.com/?a=commitdiff_plain;h=e740e74f900465daf4bffb9361cf42bdbf47ffc8;hp=f97af256ef891d0501c9a6d7985b74a23d7ebe6a;p=lilypond.git

Issue 4910/3: Avoid crash when g_spawn_sync () fails

When g_spawn_sync () fails,
`standard_output` and `standard_error` may not be set.
This commit makes to check whether or not the value is valid.
---

diff --git a/lily/general-scheme.cc b/lily/general-scheme.cc
index 5f16d93408..1168ee9473 100644
--- a/lily/general-scheme.cc
+++ b/lily/general-scheme.cc
@@ -662,8 +662,11 @@ LY_DEFINE (ly_spawn, "ly:spawn",
   // Always get the pointer to the stdout/stderr messages
   int exit_status = ly_run_command (argv, &standard_output, &standard_error);
 
-  // Print out stdout and stderr only in debug mode
-  debug_output (string ("\n") + standard_output + standard_error, true);
+  if (standard_output && standard_error)
+    {
+      // Print out stdout and stderr only in debug mode
+      debug_output (string ("\n") + standard_output + standard_error, true);
+    }
 
   g_free (standard_error);
   g_free (standard_output);