extmod/modlwip: Fix case where concurrency lock isn't released on error.
@@ -536,6 +536,15 @@ STATIC mp_uint_t lwip_udp_receive(lwip_socket_obj_t *socket, byte *buf, mp_uint_
} \
assert(socket->pcb.tcp);
+// Version of above for use when lock is held
+#define STREAM_ERROR_CHECK_WITH_LOCK(socket) \
+ if (socket->state < 0) { \
+ *_errno = error_lookup_table[-socket->state]; \
+ MICROPY_PY_LWIP_EXIT \
+ return MP_STREAM_ERROR; \
+ } \
+ assert(socket->pcb.tcp);
+
// Helper function for send/sendto to handle TCP packets
STATIC mp_uint_t lwip_tcp_send(lwip_socket_obj_t *socket, const byte *buf, mp_uint_t len, int *_errno) {
@@ -572,7 +581,7 @@ STATIC mp_uint_t lwip_tcp_send(lwip_socket_obj_t *socket, const byte *buf, mp_ui
}
// While we waited, something could happen
- STREAM_ERROR_CHECK(socket);
+ STREAM_ERROR_CHECK_WITH_LOCK(socket);
}
u16_t write_len = MIN(available, len);
