netstats_parser: Fix crash when network device names are undefined

There is absolutely nothing this parser can do without the network
names. If the pointer happens to be zero, all we can do is to bail out
with a error print. Not handling this situation will lead to a crash.

Signed-off-by: Timo Kokkonen <timo.t.kokkonen@iki.fi>

diff --git a/parser.c b/parser.c
index d7aa293065b324dda750aceb2fe54062116cc7c6..fcc319225178f06a0cf716f754ef948211bd0acd 100644 (file)
--- a/parser.c
+++ b/parser.c
@@ -242,6 +242,11 @@ int netstats_parser(char *rrd_data, void *parser_data)
        int max_str = RRD_DATA_MAX_LEN;
        int ret;
 
+       if (!parser_data) {
+               pr_err("No device names specified\n");
+               return -1;
+       }
+
        while(*iface_name) {
                pr_info("getting data for iface %s\n", *iface_name);
                ret = get_iface_stats(*iface_name, &stat);