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Protect against AsyncClient being destroyed in the middle of processing

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- Take the _asyncsock_mutex in AsyncClient destructor. This should
  handle scenarios where a previously-valid client is destroyed by
  another task while being examined by the asyncTcpSock task.
- Since the _asyncsock_mutex is released before being taken again by the
  AsyncSocketBase destructor, examined objects may be still "half-destroyed"
  (AsyncClient destructor terminated and _write_mutex invalid, but still
   waiting for lock in AsyncSocketBase destructor). However, _socket may
   now be guaranteed to  remain valid if it was valid when the
   _asyncsock_mutex was taken.
This commit is contained in:
Alex Villacís Lasso
2021-09-08 12:53:22 -05:00
parent 8607ac169b
commit 8ee20adb2b
1 changed files with 11 additions and 3 deletions
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14
src/AsyncTCP.cpp
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@@ -88,7 +88,9 @@ void _asynctcpsock_task(void *)
xSemaphoreTakeRecursive(_asyncsock_mutex, (TickType_t)portMAX_DELAY);
// Collect all of the active sockets into socket set
// Collect all of the active sockets into socket set. Half-destroyed
// connections should have set _socket to -1 and therefore should not
// end up in the sockList.
FD_ZERO(&sockSet_r); FD_ZERO(&sockSet_w);
for (it = _socketBaseList.begin(); it != _socketBaseList.end(); it++) {
if ((*it)->_socket != -1) {
@@ -123,7 +125,9 @@ void _asynctcpsock_task(void *)
// Check all sockets to see which ones are active
uint32_t nActive = 0;
if (r > 0) {
// Collect and notify all writable sockets
// Collect and notify all writable sockets. Half-destroyed connections
// should have set _socket to -1 and therefore should not end up in
// the sockList.
for (it = _socketBaseList.begin(); it != _socketBaseList.end(); it++) {
if ((*it)->_selected && FD_ISSET((*it)->_socket, &sockSet_w)) {
sockList.push_back(*it);
@@ -147,7 +151,9 @@ void _asynctcpsock_task(void *)
}
sockList.clear();
// Collect and notify all readable sockets
// Collect and notify all readable sockets. Half-destroyed connections
// should have set _socket to -1 and therefore should not end up in
// the sockList.
for (it = _socketBaseList.begin(); it != _socketBaseList.end(); it++) {
if ((*it)->_selected && FD_ISSET((*it)->_socket, &sockSet_r)) {
sockList.push_back(*it);
@@ -294,10 +300,12 @@ AsyncClient::AsyncClient(int sockfd)
AsyncClient::~AsyncClient()
{
xSemaphoreTakeRecursive(_asyncsock_mutex, (TickType_t)portMAX_DELAY);
if (_socket != -1) _close();
_removeAllCallbacks();
vSemaphoreDelete(_write_mutex);
_write_mutex = NULL;
xSemaphoreGiveRecursive(_asyncsock_mutex);
}
void AsyncClient::setRxTimeout(uint32_t timeout){