When stack stats enabled, prevent exceptions if memory allocations fail

features/frameworks/greentea-client/source/greentea_metrics.cpp

@@ -107,7 +107,11 @@ MBED_UNUSED static void send_stack_info()
 
     // Print info for all other threads
     uint32_t thread_n = osThreadGetCount();
-    osThreadId_t *threads = new osThreadId_t[thread_n];
+    osThreadId_t *threads = new (std::nothrow) osThreadId_t[thread_n];
+    // Don't fail on lack of memory
+    if (!threads) {
+        goto end;
+    }
     thread_n = osThreadEnumerate(threads, thread_n);
 
     for(size_t i = 0; i < thread_n; i++) {
@@ -117,6 +121,7 @@ MBED_UNUSED static void send_stack_info()
 
     delete[] threads;
 
+end:
     mutex->unlock();
 }
 

platform/mbed_stats.c

@@ -41,7 +41,10 @@ void mbed_stats_stack_get(mbed_stats_stack_t *stats)
     osThreadId_t *threads;
 
     threads = malloc(sizeof(osThreadId_t) * thread_n);
-    MBED_ASSERT(threads != NULL);
+    // Don't fail on lack of memory
+    if (!threads) {
+        return;
+    }
 
     osKernelLock();
     thread_n = osThreadEnumerate(threads, thread_n);
@@ -69,7 +72,10 @@ size_t mbed_stats_stack_get_each(mbed_stats_stack_t *stats, size_t count)
     osThreadId_t *threads;
 
     threads = malloc(sizeof(osThreadId_t) * count);
-    MBED_ASSERT(threads != NULL);
+    // Don't fail on lack of memory
+    if (!threads) {
+        return 0;
+    }
 
     osKernelLock();
     count = osThreadEnumerate(threads, count);