gprs_ns2: add recursive anchor to protect against double free
When free'ing a NSE/NSVC/BIND ensure there can't be a double
free by using a free anchor in the struct.
Recursive free's can happen when the NS user reacts on an event
(e.g. GPRS_NS2_AFF_CAUSE_VC_FAILURE) and calls the free().
Or when the user free's a NSVC when the NSE uses SNS as configuration,
the fsm tries to free it again.
Change-Id: If9823aadaa936e136aa43e88cee925ddd5974841
diff --git a/src/gb/gprs_ns2_internal.h b/src/gb/gprs_ns2_internal.h
index db01c2e..95efbae 100644
--- a/src/gb/gprs_ns2_internal.h
+++ b/src/gb/gprs_ns2_internal.h
@@ -215,6 +215,9 @@
/*! NSE-wide statistics */
struct rate_ctr_group *ctrg;
+
+ /*! recursive anchor */
+ bool freed;
};
/*! Structure representing a single NS-VC */
@@ -259,6 +262,9 @@
enum gprs_ns2_vc_mode mode;
struct osmo_fsm_inst *fi;
+
+ /*! recursive anchor */
+ bool freed;
};
/*! Structure repesenting a bind instance. E.g. IPv4 listen port. */
@@ -303,6 +309,9 @@
uint8_t sns_data_weight;
struct osmo_stat_item_group *statg;
+
+ /*! recursive anchor */
+ bool freed;
};
struct gprs_ns2_vc_driver {