Merge branch 'collectd-4.5' into collectd-4.6

[collectd.git] / src / rrdtool.c

diff --git a/src/rrdtool.c b/src/rrdtool.c
index 95bde69..bbebc37 100644 (file)
--- a/src/rrdtool.c
+++ b/src/rrdtool.c
@@ -223,7 +223,7 @@ static int value_list_to_string (char *buffer, int buffer_len,
 } /* int value_list_to_string */
 
 static int value_list_to_filename (char *buffer, int buffer_len,
-               const data_set_t *ds, const value_list_t *vl)
+               const data_set_t __attribute__((unused)) *ds, const value_list_t *vl)
 {
        int offset = 0;
        int status;
@@ -266,7 +266,7 @@ static int value_list_to_filename (char *buffer, int buffer_len,
        return (0);
 } /* int value_list_to_filename */
 
-static void *rrd_queue_thread (void *data)
+static void *rrd_queue_thread (void __attribute__((unused)) *data)
 {
         struct timeval tv_next_update;
         struct timeval tv_now;
@@ -279,14 +279,17 @@ static void *rrd_queue_thread (void *data)
                rrd_cache_t *cache_entry;
                char **values;
                int    values_num;
+               int    status;
                int    i;
 
+               values = NULL;
+               values_num = 0;
+
                 pthread_mutex_lock (&queue_lock);
                 /* Wait for values to arrive */
                 while (true)
                 {
                   struct timespec ts_wait;
-                  int status;
 
                   while ((flushq_head == NULL) && (queue_head == NULL)
                       && (do_shutdown == 0))
@@ -361,17 +364,28 @@ static void *rrd_queue_thread (void *data)
                 * we make a copy of it's values */
                pthread_mutex_lock (&cache_lock);
 
-               c_avl_get (cache, queue_entry->filename, (void *) &cache_entry);
+               status = c_avl_get (cache, queue_entry->filename,
+                               (void *) &cache_entry);
 
-               values = cache_entry->values;
-               values_num = cache_entry->values_num;
+               if (status == 0)
+               {
+                       values = cache_entry->values;
+                       values_num = cache_entry->values_num;
 
-               cache_entry->values = NULL;
-               cache_entry->values_num = 0;
-               cache_entry->flags = FLAG_NONE;
+                       cache_entry->values = NULL;
+                       cache_entry->values_num = 0;
+                       cache_entry->flags = FLAG_NONE;
+               }
 
                pthread_mutex_unlock (&cache_lock);
 
+               if (status != 0)
+               {
+                       sfree (queue_entry->filename);
+                       sfree (queue_entry);
+                       continue;
+               }
+
                /* Update `tv_next_update' */
                if (write_rate > 0.0) 
                 {
@@ -625,6 +639,15 @@ static int rrd_cache_insert (const char *filename,
 
        pthread_mutex_lock (&cache_lock);
 
+       /* This shouldn't happen, but it did happen at least once, so we'll be
+        * careful. */
+       if (cache == NULL)
+       {
+               pthread_mutex_unlock (&cache_lock);
+               WARNING ("rrdtool plugin: cache == NULL.");
+               return (-1);
+       }
+
        c_avl_get (cache, filename, (void *) &rc);
 
        if (rc == NULL)