From 8b35a3e93355e972cf079901c882ad6cf196ff18 Mon Sep 17 00:00:00 2001
From: Vsevolod Stakhov <vsevolod@highsecure.ru>
Date: Thu, 9 Jun 2016 09:30:19 +0100
Subject: [PATCH] [Fix] Try to fix issue in redis stats backend when task is
 closed

---
 src/libstat/backends/redis_backend.c | 39 +++++++++++++++++++++++++++-
 1 file changed, 38 insertions(+), 1 deletion(-)

diff --git a/src/libstat/backends/redis_backend.c b/src/libstat/backends/redis_backend.c
index 4f65a673c..ea852566e 100644
--- a/src/libstat/backends/redis_backend.c
+++ b/src/libstat/backends/redis_backend.c
@@ -22,6 +22,7 @@
 #ifdef WITH_HIREDIS
 #include "hiredis.h"
 #include "adapters/libevent.h"
+#include "ref.h"
 
 
 #define REDIS_CTX(p) (struct redis_stat_ctx *)(p)
@@ -64,6 +65,7 @@ struct redis_stat_runtime {
 	guint64 learned;
 	gint id;
 	enum rspamd_redis_connection_state conn_state;
+	ref_entry_t ref;
 };
 
 /* Used to get statistics from redis */
@@ -722,6 +724,12 @@ rspamd_redis_connected (redisAsyncContext *c, gpointer r, gpointer priv)
 
 	task = rt->task;
 
+	if (rt->conn_state != RSPAMD_REDIS_CONNECTED) {
+		/* Task has disappeared already */
+		REF_RELEASE (rt);
+		return;
+	}
+
 	if (c->err == 0) {
 		if (r != NULL) {
 			if (G_LIKELY (reply->type == REDIS_REPLY_INTEGER)) {
@@ -748,6 +756,7 @@ rspamd_redis_connected (redisAsyncContext *c, gpointer r, gpointer priv)
 			rt->learned = val;
 
 			rt->conn_state = RSPAMD_REDIS_CONNECTED;
+			REF_RETAIN (rt);
 
 			msg_debug_task ("connected to redis server, tokens learned for %s: %uL",
 					rt->redis_object_expanded, rt->learned);
@@ -765,6 +774,8 @@ rspamd_redis_connected (redisAsyncContext *c, gpointer r, gpointer priv)
 		rspamd_upstream_fail (rt->selected);
 		rspamd_session_remove_event (task->s, rspamd_redis_fin, rt);
 	}
+
+	REF_RELEASE (rt);
 }
 
 /* Called when we have received tokens values from redis */
@@ -781,6 +792,12 @@ rspamd_redis_processed (redisAsyncContext *c, gpointer r, gpointer priv)
 
 	task = rt->task;
 
+	if (rt->conn_state != RSPAMD_REDIS_CONNECTED) {
+		/* Task has disappeared already */
+		REF_RELEASE (rt);
+		return;
+	}
+
 	if (c->err == 0) {
 		if (r != NULL) {
 			if (reply->type == REDIS_REPLY_ARRAY) {
@@ -848,6 +865,8 @@ rspamd_redis_processed (redisAsyncContext *c, gpointer r, gpointer priv)
 		rspamd_upstream_fail (rt->selected);
 		rspamd_session_remove_event (task->s, rspamd_redis_fin, rt);
 	}
+
+	REF_RELEASE (rt);
 }
 
 /* Called when we have set tokens during learning */
@@ -859,6 +878,12 @@ rspamd_redis_learned (redisAsyncContext *c, gpointer r, gpointer priv)
 
 	task = rt->task;
 
+	if (rt->conn_state != RSPAMD_REDIS_CONNECTED) {
+		/* Task has disappeared already */
+		REF_RELEASE (rt);
+		return;
+	}
+
 	if (c->err == 0) {
 		rspamd_upstream_ok (rt->selected);
 		rspamd_session_remove_event (task->s, rspamd_redis_fin_learn, rt);
@@ -874,6 +899,8 @@ rspamd_redis_learned (redisAsyncContext *c, gpointer r, gpointer priv)
 		redisAsyncFree (rt->redis);
 		rt->conn_state = RSPAMD_REDIS_DISCONNECTED;
 	}
+
+	REF_RELEASE (rt);
 }
 
 static gboolean
@@ -1053,6 +1080,12 @@ rspamd_redis_init (struct rspamd_stat_ctx *ctx,
 	return (gpointer)backend;
 }
 
+static void
+rspamd_redis_runtime_dtor (struct redis_stat_runtime *rt)
+{
+	g_slice_free1 (sizeof (*rt), rt);
+}
+
 gpointer
 rspamd_redis_runtime (struct rspamd_task *task,
 		struct rspamd_statfile_config *stcf,
@@ -1090,7 +1123,8 @@ rspamd_redis_runtime (struct rspamd_task *task,
 		return NULL;
 	}
 
-	rt = rspamd_mempool_alloc0 (task->task_pool, sizeof (*rt));
+	rt = g_slice_alloc0 (sizeof (*rt));
+	REF_INIT_RETAIN (rt, rspamd_redis_runtime_dtor);
 	rspamd_redis_expand_object (ctx->redis_object, ctx, task,
 			&rt->redis_object_expanded);
 	rt->selected = up;
@@ -1192,6 +1226,8 @@ rspamd_redis_finalize_process (struct rspamd_task *task, gpointer runtime,
 		rt->redis = NULL;
 
 		rt->conn_state = RSPAMD_REDIS_DISCONNECTED;
+
+		REF_RELEASE (rt);
 	}
 }
 
@@ -1329,6 +1365,7 @@ rspamd_redis_finalize_learn (struct rspamd_task *task, gpointer runtime,
 		rt->redis = NULL;
 
 		rt->conn_state = RSPAMD_REDIS_DISCONNECTED;
+		REF_RELEASE (rt);
 	}
 }
 
-- 
2.39.5