prevented buffer overflow when there are too many dimensions on a chart

diff --git a/src/rrd2json.c b/src/rrd2json.c
index 575066e4598a44d62c01d55b5dc09060f109f268..875ea6d9202c3e57b8279f658fc2080c4806bdb7 100755 (executable)
--- a/src/rrd2json.c
+++ b/src/rrd2json.c
@@ -12,7 +12,7 @@ char *hostname = "unknown";
 unsigned long rrd_stats_one_json(RRDSET *st, char *options, struct web_buffer *wb)
 {
        time_t now = time(NULL);
-       web_buffer_increase(wb, 16384);
+       web_buffer_increase(wb, 65536);
 
        pthread_rwlock_rdlock(&st->rwlock);
 
@@ -67,6 +67,8 @@ unsigned long rrd_stats_one_json(RRDSET *st, char *options, struct web_buffer *w
 
        RRDDIM *rd;
        for(rd = st->dimensions; rd ; rd = rd->next) {
+               web_buffer_increase(wb, 4096);
+
                memory += rd->memsize;
 
                web_buffer_printf(wb,
@@ -118,7 +120,7 @@ unsigned long rrd_stats_one_json(RRDSET *st, char *options, struct web_buffer *w
 
 void rrd_stats_graph_json(RRDSET *st, char *options, struct web_buffer *wb)
 {
-       web_buffer_increase(wb, 16384);
+       web_buffer_increase(wb, 2048);
 
        web_buffer_printf(wb, RRD_GRAPH_JSON_HEADER);
        rrd_stats_one_json(st, options, wb);
@@ -127,7 +129,7 @@ void rrd_stats_graph_json(RRDSET *st, char *options, struct web_buffer *wb)
 
 void rrd_stats_all_json(struct web_buffer *wb)
 {
-       web_buffer_increase(wb, 1024);
+       web_buffer_increase(wb, 2048);
 
        unsigned long memory = 0;
        long c;