net-snmp: fix memory leak

Backport patch [1] to fix memory leak by freeing tclist
[1] 4bd0d9a8a2

Signed-off-by: Jinfeng Wang <jinfeng.wang.cn@windriver.com>

meta-networking/recipes-protocols/net-snmp/net-snmp/0001-unload_all_mibs-fix-memory-leak-by-freeing-tclist.patch

@@ -0,0 +1,32 @@
+From 606e2cbb2d607820345aa20d4095613b1f563a08 Mon Sep 17 00:00:00 2001
+From: Jinfeng Wang <jinfeng.wang.cn@windriver.com>
+Date: Wed, 9 Apr 2025 09:24:45 +0800
+Subject: [PATCH] unload_all_mibs: fix memory leak by freeing tclist
+
+tclist is always allocated in netsnmp_init_mib_internals, when doing multiple init_snmp("")/snmp_shutdown("") this memory is never free'd.
+Remove the special character in the origin commit.
+
+Upstream-Status: Backport [https://github.com/net-snmp/net-snmp/commit/4bd0d9a8a2860c2c46307aef5ee1ccc69f7e3b62]
+
+Signed-off-by: Jinfeng Wang <jinfeng.wang.cn@windriver.com>
+---
+ snmplib/parse.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/snmplib/parse.c b/snmplib/parse.c
+index 9406f4f88..2f9a20175 100644
+--- a/snmplib/parse.c
++++ b/snmplib/parse.c
+@@ -4225,7 +4225,8 @@ unload_all_mibs(void)
+         if (ptc->description)
+             free(ptc->description);
+     }
+-    memset(tclist, 0, tc_alloc * sizeof(struct tc));
++    SNMP_FREE(tclist);
++    tc_alloc = 0;
+ 
+     memset(buckets, 0, sizeof(buckets));
+     memset(nbuckets, 0, sizeof(nbuckets));
+-- 
+2.34.1
+

meta-networking/recipes-protocols/net-snmp/net-snmp_5.9.3.bb

@@ -27,6 +27,7 @@ SRC_URI = "${SOURCEFORGE_MIRROR}/net-snmp/net-snmp-${PV}.tar.gz \
            file://reproducibility-have-printcap.patch \
            file://0001-ac_add_search_path.m4-keep-consistent-between-32bit.patch \
            file://CVE-2022-44792-CVE-2022-44793.patch \
+           file://0001-unload_all_mibs-fix-memory-leak-by-freeing-tclist.patch \
            "
 SRC_URI[sha256sum] = "2097f29b7e1bf3f1300b4bae52fa2308d0bb8d5d3998dbe02f9462a413a2ef0a"