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In the mainloop function, calling __skynet_free__ frees the pointer which may has already been freed in __push_socket_data__.
mainloop(struct skynet_context * context, void * ud, int type, int session, uint32_t source, const void * msg, size_t sz) {
struct harbor * h = ud;
switch (type) {
case PTYPE_SOCKET: {
const struct skynet_socket_message * message = msg;
switch(message->type) {
case SKYNET_SOCKET_TYPE_DATA:
push_socket_data(h, message);
skynet_free(message->buffer);
// skip...
To fix this potential double-free bug, clear the pointer message->buffer in __push_socket_data__ after the pointer is freed.
Skynet
Skynet is a lightweight online game framework, and it can be used in many other fields.
Build
For Linux, install autoconf first for jemalloc:
git clone https://github.com/cloudwu/skynet.git
cd skynet
make 'PLATFORM' # PLATFORM can be linux, macosx, freebsd now
Or you can:
export PLAT=linux
make
For FreeBSD , use gmake instead of make.
Test
Run these in different consoles:
./skynet examples/config # Launch first skynet node (Gate server) and a skynet-master (see config for standalone option)
./3rd/lua/lua examples/client.lua # Launch a client, and try to input hello.
About Lua version
Skynet now uses a modified version of lua 5.3.4 ( https://github.com/ejoy/lua/tree/skynet ) for multiple lua states.
You can also use official Lua versions, just edit the Makefile by yourself.
How To Use (Sorry, Only in Chinese now)
- Read Wiki for documents https://github.com/cloudwu/skynet/wiki
- The FAQ in wiki https://github.com/cloudwu/skynet/wiki/FAQ