Merge #1315

1315: Don't interleave iterating over environ with unsetting environment variables r=Saviq a=AlanGriffiths

Don't interleave iterating over environ with unsetting environment variables

Co-authored-by: Alan Griffiths <alan@octopull.co.uk>

src/miral/launch_app.cpp

@@ -23,28 +23,36 @@
 
 #include <stdexcept>
 #include <cstring>
+#include <vector>
 
 namespace
 {
 void strip_mir_env_variables()
 {
     static char const mir_prefix[] = "MIR_";
 
+    std::vector<std::string> vars_to_remove;
+
     for (auto var = environ; *var; ++var)
     {
         auto const var_begin = *var;
         if (strncmp(var_begin, mir_prefix, sizeof(mir_prefix) - 1) == 0)
         {
             if (auto var_end = strchr(var_begin, '='))
             {
-                unsetenv(std::string(var_begin, var_end).c_str());
+                vars_to_remove.emplace_back(var_begin, var_end);
             }
             else
             {
-                unsetenv(var_begin);
+                vars_to_remove.emplace_back(var_begin);
             }
         }
     }
+
+    for (auto const& var : vars_to_remove)
+    {
+        unsetenv(var.c_str());
+    }
 }
 }