src: normalize malloc, realloc

malloc(0) and realloc(ptr, 0) have implementation-defined behavior in
that the standard allows them to either return a unique pointer or a
nullptr for zero-sized allocation requests.  Normalize by always using
a nullptr.

- Introduce node::malloc, node::realloc and node::calloc that should
  be used throught our source.
- Update all existing node source files to use the new functions
  instead of the native allocation functions.

Fixes: https://github.com/nodejs/node/issues/7549
PR-URL: https://github.com/nodejs/node/pull/7564
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/stream_wrap.cc b/src/stream_wrap.cc
index 17278ff83a..2b50895c9f 100644
--- a/src/stream_wrap.cc
+++ b/src/stream_wrap.cc
@@ -148,7 +148,7 @@ void StreamWrap::OnAlloc(uv_handle_t* handle,
 
 
 void StreamWrap::OnAllocImpl(size_t size, uv_buf_t* buf, void* ctx) {
-  buf->base = static_cast<char*>(malloc(size));
+  buf->base = static_cast<char*>(node::Malloc(size));
   buf->len = size;
 
   if (buf->base == nullptr && size > 0) {
@@ -204,7 +204,7 @@ void StreamWrap::OnReadImpl(ssize_t nread,
     return;
   }
 
-  char* base = static_cast<char*>(realloc(buf->base, nread));
+  char* base = static_cast<char*>(node::Realloc(buf->base, nread));
   CHECK_LE(static_cast<size_t>(nread), buf->len);
 
   if (pending == UV_TCP) {