From 7c073e3a1b736689135fd2ed44ede5b83790bd37 Mon Sep 17 00:00:00 2001
From: Bart Van Assche <bvanassche@acm.org>
Date: Mon, 26 Aug 2019 18:32:08 -0700
Subject: IP-MIB, Linux: Fix a memory leak in an error path

When a Linux system is booted with "ipv6.disable=1" in the kernel command
line, the file "/proc/net/snmp6" is not created. Fix the memory leak in
_systemstats_v6_load_systemstats() that is triggered with IPv6 disabled.

See also https://sourceforge.net/p/net-snmp/bugs/2976/.

Reported-by: Mark E Rusk <marker55@users.sourceforge.net>
---
 agent/mibgroup/ip-mib/data_access/systemstats_linux.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/agent/mibgroup/ip-mib/data_access/systemstats_linux.c b/agent/mibgroup/ip-mib/data_access/systemstats_linux.c
index e28ff93..f68d122 100644
--- a/agent/mibgroup/ip-mib/data_access/systemstats_linux.c
+++ b/agent/mibgroup/ip-mib/data_access/systemstats_linux.c
@@ -560,10 +560,12 @@ _systemstats_v6_load_systemstats(netsnmp_container* container, u_int load_flags)
      * try to open file. If we can't, that's ok - maybe the module hasn't
      * been loaded yet.
      */
-    if (!(devin = fopen(filename, "r"))) {
+    devin = fopen(filename, "r");
+    if (!devin) {
         DEBUGMSGTL(("access:systemstats",
                 "Failed to load Systemstats Table (linux1), cannot open %s\n",
                 filename));
+        netsnmp_access_systemstats_entry_free(entry);
         return 0;
     }
     
-- 
2.7.4