WiFiClientSecure: don't panic if memory allocation fails

If it fails due to a malloc somewhere in bigint.c, we will still crash (although with a less obvious crash message). If it fails in increase_bm_data_size, axTLS will handle this and report that connection has been aborted. This error will be passed on to the user, so that an application can recover and attempt to reconnect.

Author: igrr

libraries/ESP8266WiFi/src/WiFiClientSecure.cpp

@@ -532,10 +532,8 @@ extern "C" int ax_get_file(const char *filename, uint8_t **buf) {
 
 extern "C" void* ax_port_malloc(size_t size, const char* file, int line) {
     void* result = malloc(size);
-
     if (result == nullptr) {
         DEBUG_TLS_MEM_PRINT("%s:%d malloc %d failed, left %d\r\n", file, line, size, ESP.getFreeHeap());
-        panic();
     }
     if (size >= 1024) {
         DEBUG_TLS_MEM_PRINT("%s:%d malloc %d, left %d\r\n", file, line, size, ESP.getFreeHeap());
@@ -553,7 +551,6 @@ extern "C" void* ax_port_realloc(void* ptr, size_t size, const char* file, int l
     void* result = realloc(ptr, size);
     if (result == nullptr) {
         DEBUG_TLS_MEM_PRINT("%s:%d realloc %d failed, left %d\r\n", file, line, size, ESP.getFreeHeap());
-        panic();
     }
     if (size >= 1024) {
         DEBUG_TLS_MEM_PRINT("%s:%d realloc %d, left %d\r\n", file, line, size, ESP.getFreeHeap());
@@ -563,9 +560,4 @@ extern "C" void* ax_port_realloc(void* ptr, size_t size, const char* file, int l
 
 extern "C" void ax_port_free(void* ptr) {
     free(ptr);
-    uint32_t *p = (uint32_t*) ptr;
-    size_t size = p[-3];
-    if (size >= 1024) {
-        DEBUG_TLS_MEM_PRINT("free %d, left %d\r\n", p[-3], ESP.getFreeHeap());
-    }
 }