Index: lib/libc/stdlib/getenv.c
===================================================================
--- lib/libc/stdlib/getenv.c
+++ lib/libc/stdlib/getenv.c
@@ -278,6 +278,9 @@
 		    sizeof(*intEnviron));
 		if (tmpEnviron == NULL)
 			return (-1);
+		/* Zero the newly allocated memory. */
+		memset(tmpEnviron + environSize * sizeof(*intEnviron), 0,
+		    (tmpEnvironSize + 1 - environSize) * sizeof(*intEnviron));
 		environSize = tmpEnvironSize;
 		intEnviron = tmpEnviron;
 	}
@@ -314,6 +317,9 @@
 			envVarsTotal--;
 			return (false);
 		}
+		/* Zero the newly allocated memory. */
+		memset(tmpEnvVars + envVarsSize * sizeof(*envVars), 0,
+		    (newEnvVarsSize - envVarsSize) * sizeof(*envVars));
 		envVarsSize = newEnvVarsSize;
 		envVars = tmpEnvVars;
 	}