ethstat plugin: Initialize realloc'ated memory.

The last element in "interfaces" is not guaranteed to be zeroed, resulting in a
segfault when cf_util_get_string() tries to free the "pointer".

Thanks to Mark T. Voelker for reporting and analyzing this bug!
This should fix Github issue #133.

diff --git a/src/ethstat.c b/src/ethstat.c
index 746fc61..08381a8 100644 (file)
--- a/src/ethstat.c
+++ b/src/ethstat.c
@@ -66,6 +66,7 @@ static int ethstat_add_interface (const oconfig_item_t *ci) /* {{{ */
   if (tmp == NULL)
     return (-1);
   interfaces = tmp;
+  interfaces[interfaces_num] = NULL;
 
   status = cf_util_get_string (ci, interfaces + interfaces_num);
   if (status != 0)