isisd: fix asla memory leak

> ==713776==ERROR: LeakSanitizer: detected memory leaks
>
> Direct leak of 120 byte(s) in 1 object(s) allocated from:
>     #0 0x7fdfcbeb4a57 in __interceptor_calloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:154
>     #1 0x7fdfcb86f8dd in qcalloc lib/memory.c:105
>     #2 0x55ce707739b6 in isis_tlvs_find_alloc_asla isisd/isis_tlvs.c:8500
>     #3 0x55ce7072fae0 in isis_link_params_update_asla isisd/isis_te.c:191
>     FRRouting#4 0x55ce70733881 in isis_link_params_update isisd/isis_te.c:499
>     FRRouting#5 0x55ce70693f2a in isis_circuit_up isisd/isis_circuit.c:776
>     FRRouting#6 0x55ce7069a120 in isis_csm_state_change isisd/isis_csm.c:135
>     FRRouting#7 0x55ce7068dd80 in isis_circuit_enable isisd/isis_circuit.c:79
>     FRRouting#8 0x55ce70699346 in isis_ifp_create isisd/isis_circuit.c:1618
>     FRRouting#9 0x7fdfcb81f47f in hook_call_if_real lib/if.c:55
>     FRRouting#10 0x7fdfcb82056e in if_new_via_zapi lib/if.c:188
>     FRRouting#11 0x7fdfcb9d17da in zclient_interface_add lib/zclient.c:2706
>     FRRouting#12 0x7fdfcb9df842 in zclient_read lib/zclient.c:4843
>     FRRouting#13 0x7fdfcb97798e in event_call lib/event.c:2011
>     FRRouting#14 0x7fdfcb842ff1 in frr_run lib/libfrr.c:1216
>     FRRouting#15 0x55ce7067cbf2 in main isisd/isis_main.c:360
>     FRRouting#16 0x7fdfcb229d8f in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
>
> Indirect leak of 8 byte(s) in 1 object(s) allocated from:
>     #0 0x7fdfcbeb4a57 in __interceptor_calloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:154
>     #1 0x7fdfcb86f8dd in qcalloc lib/memory.c:105
>     #2 0x7fdfcb79a7b7 in admin_group_init lib/admin_group.c:186
>     #3 0x55ce707739ca in isis_tlvs_find_alloc_asla isisd/isis_tlvs.c:8501
>     FRRouting#4 0x55ce7072fae0 in isis_link_params_update_asla isisd/isis_te.c:191
>     FRRouting#5 0x55ce70733881 in isis_link_params_update isisd/isis_te.c:499
>     FRRouting#6 0x55ce70693f2a in isis_circuit_up isisd/isis_circuit.c:776
>     FRRouting#7 0x55ce7069a120 in isis_csm_state_change isisd/isis_csm.c:135
>     FRRouting#8 0x55ce7068dd80 in isis_circuit_enable isisd/isis_circuit.c:79
>     FRRouting#9 0x55ce70699346 in isis_ifp_create isisd/isis_circuit.c:1618
>     FRRouting#10 0x7fdfcb81f47f in hook_call_if_real lib/if.c:55
>     FRRouting#11 0x7fdfcb82056e in if_new_via_zapi lib/if.c:188
>     FRRouting#12 0x7fdfcb9d17da in zclient_interface_add lib/zclient.c:2706
>     FRRouting#13 0x7fdfcb9df842 in zclient_read lib/zclient.c:4843
>     FRRouting#14 0x7fdfcb97798e in event_call lib/event.c:2011
>     FRRouting#15 0x7fdfcb842ff1 in frr_run lib/libfrr.c:1216
>     FRRouting#16 0x55ce7067cbf2 in main isisd/isis_main.c:360
>     FRRouting#17 0x7fdfcb229d8f in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58

PR: 95719
Fixes: 5749ac8 ("isisd: add ASLA support")
Signed-off-by: Louis Scalbert <[email protected]>

Author: louis-6wind

isisd/isis_tlvs.c

@@ -129,6 +129,7 @@ static int unpack_tlvs(enum isis_tlv_context context, size_t avail_len,
 		       struct stream *stream, struct sbuf *log, void *dest,
 		       int indent, bool *unpacked_known_tlvs);
 static void isis_free_subsubtlvs(struct isis_subsubtlvs *subsubtlvs);
+static void isis_tlvs_del_asla_free(void *arg);
 
 /* For tests/isisd, TLV text requires ipv4-unicast instead of standard */
 static const char *isis_mtid2str_fake(uint16_t mtid)
@@ -147,6 +148,7 @@ struct isis_ext_subtlvs *isis_alloc_ext_subtlvs(void)
 	init_item_list(&ext->adj_sid);
 	init_item_list(&ext->lan_sid);
 	ext->aslas = list_new();
+	ext->aslas->del = isis_tlvs_del_asla_free;
 
 	init_item_list(&ext->srv6_endx_sid);
 	init_item_list(&ext->srv6_lan_endx_sid);
@@ -8136,12 +8138,19 @@ void isis_tlvs_del_srv6_lan_endx_sid(struct isis_ext_subtlvs *exts,
 		UNSET_SUBTLV(exts, EXT_SRV6_LAN_ENDX_SID);
 }
 
+static void isis_tlvs_del_asla_free(void *arg)
+{
+	struct isis_asla_subtlvs *asla = arg;
+
+	admin_group_term(&asla->ext_admin_group);
+	XFREE(MTYPE_ISIS_SUBTLV, asla);
+}
+
 void isis_tlvs_del_asla_flex_algo(struct isis_ext_subtlvs *ext,
 				  struct isis_asla_subtlvs *asla)
 {
-	admin_group_term(&asla->ext_admin_group);
 	listnode_delete(ext->aslas, asla);
-	XFREE(MTYPE_ISIS_SUBTLV, asla);
+	isis_tlvs_del_asla_free(asla);
 }
 
 struct isis_asla_subtlvs *