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net-snmp/SOURCES/net-snmp-5.8-dev-mem-leak.p...

36 lines
1.6 KiB

From 8bb544fbd2d6986a9b73d3fab49235a4baa96c23 Mon Sep 17 00:00:00 2001
From: Bart Van Assche <bvanassche@acm.org>
Date: Sat, 31 Jul 2021 16:21:16 -0700
Subject: [PATCH] Linux: IF-MIB: Fix a memory leak
The Linux kernel regenerates proc files in their entirety every time a 4 KiB
boundary is crossed. This can result in reading the same network interface
twice if network information changes while it is being read. Fix a memory
leak that can be triggered if /proc/net/dev changes while being read.
---
agent/mibgroup/if-mib/data_access/interface_linux.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/agent/mibgroup/if-mib/data_access/interface_linux.c b/agent/mibgroup/if-mib/data_access/interface_linux.c
index e99360a216..215b30e806 100644
--- a/agent/mibgroup/if-mib/data_access/interface_linux.c
+++ b/agent/mibgroup/if-mib/data_access/interface_linux.c
@@ -921,7 +921,15 @@ netsnmp_arch_interface_container_load(netsnmp_container* container,
/*
* add to container
*/
- CONTAINER_INSERT(container, entry);
+ if (CONTAINER_INSERT(container, entry) != 0) {
+ netsnmp_interface_entry *existing =
+ CONTAINER_FIND(container, entry);
+ NETSNMP_LOGONCE((LOG_WARNING,
+ "Encountered interface with index %" NETSNMP_PRIz "u twice: %s <> %s",
+ entry->index, existing ? existing->name : "(?)",
+ entry->name));
+ netsnmp_access_interface_entry_free(entry);
+ }
}
#ifdef NETSNMP_ENABLE_IPV6
netsnmp_access_ipaddress_container_free(addr_container, 0);