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bgpd: Free Memory for SRv6 Functions and Locator Chunks
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Implement proper memory cleanup for SRv6 functions and locator chunks to prevent potential memory leaks.
The list callback deletion functions have been set.

The ASan leak log for reference:

```
***********************************************************************************
Address Sanitizer Error detected in bgp_srv6l3vpn_to_bgp_vrf.test_bgp_srv6l3vpn_to_bgp_vrf/r2.asan.bgpd.4180

=================================================================
==4180==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 544 byte(s) in 2 object(s) allocated from:
    #0 0x7f8d176a0d28 in __interceptor_calloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xded28)
    sonic-net#1 0x7f8d1709f238 in qcalloc lib/memory.c:105
    sonic-net#2 0x55d5dba6ee75 in sid_register bgpd/bgp_mplsvpn.c:591
    sonic-net#3 0x55d5dba6ee75 in alloc_new_sid bgpd/bgp_mplsvpn.c:712
    sonic-net#4 0x55d5dba6f3ce in ensure_vrf_tovpn_sid_per_af bgpd/bgp_mplsvpn.c:758
    sonic-net#5 0x55d5dba6fb94 in ensure_vrf_tovpn_sid bgpd/bgp_mplsvpn.c:849
    sonic-net#6 0x55d5dba7f975 in vpn_leak_postchange bgpd/bgp_mplsvpn.h:299
    sonic-net#7 0x55d5dba7f975 in vpn_leak_postchange_all bgpd/bgp_mplsvpn.c:3704
    sonic-net#8 0x55d5dbbb6c66 in bgp_zebra_process_srv6_locator_chunk bgpd/bgp_zebra.c:3164
    sonic-net#9 0x7f8d1716f08a in zclient_read lib/zclient.c:4459
    sonic-net#10 0x7f8d1713f034 in event_call lib/event.c:1974
    sonic-net#11 0x7f8d1708242b in frr_run lib/libfrr.c:1214
    sonic-net#12 0x55d5db99d19d in main bgpd/bgp_main.c:510
    sonic-net#13 0x7f8d160c5c86 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21c86)

Direct leak of 296 byte(s) in 1 object(s) allocated from:
    #0 0x7f8d176a0d28 in __interceptor_calloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xded28)
    sonic-net#1 0x7f8d1709f238 in qcalloc lib/memory.c:105
    sonic-net#2 0x7f8d170b1d5f in srv6_locator_chunk_alloc lib/srv6.c:135
    sonic-net#3 0x55d5dbbb6a19 in bgp_zebra_process_srv6_locator_chunk bgpd/bgp_zebra.c:3144
    sonic-net#4 0x7f8d1716f08a in zclient_read lib/zclient.c:4459
    sonic-net#5 0x7f8d1713f034 in event_call lib/event.c:1974
    sonic-net#6 0x7f8d1708242b in frr_run lib/libfrr.c:1214
    sonic-net#7 0x55d5db99d19d in main bgpd/bgp_main.c:510
    sonic-net#8 0x7f8d160c5c86 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21c86)
***********************************************************************************

```

Signed-off-by: Keelan Cannoo <[email protected]>
(cherry picked from commit 8e7044b)
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Keelan10 authored and mergify[bot] committed Nov 30, 2023
1 parent a027be0 commit 064c349
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Showing 7 changed files with 15 additions and 4 deletions.
7 changes: 6 additions & 1 deletion bgpd/bgp_mplsvpn.c
Original file line number Diff line number Diff line change
Expand Up @@ -596,6 +596,11 @@ static void sid_register(struct bgp *bgp, const struct in6_addr *sid,
listnode_add(bgp->srv6_functions, func);
}

void srv6_function_free(struct bgp_srv6_function *func)
{
XFREE(MTYPE_BGP_SRV6_FUNCTION, func);
}

void sid_unregister(struct bgp *bgp, const struct in6_addr *sid)
{
struct listnode *node, *nnode;
Expand All @@ -604,7 +609,7 @@ void sid_unregister(struct bgp *bgp, const struct in6_addr *sid)
for (ALL_LIST_ELEMENTS(bgp->srv6_functions, node, nnode, func))
if (sid_same(&func->sid, sid)) {
listnode_delete(bgp->srv6_functions, func);
XFREE(MTYPE_BGP_SRV6_FUNCTION, func);
srv6_function_free(func);
}
}

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2 changes: 1 addition & 1 deletion bgpd/bgp_vty.c
Original file line number Diff line number Diff line change
Expand Up @@ -310,7 +310,7 @@ static int bgp_srv6_locator_unset(struct bgp *bgp)
/* refresh functions */
for (ALL_LIST_ELEMENTS(bgp->srv6_functions, node, nnode, func)) {
listnode_delete(bgp->srv6_functions, func);
XFREE(MTYPE_BGP_SRV6_FUNCTION, func);
srv6_function_free(func);
}

/* refresh tovpn_sid */
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2 changes: 1 addition & 1 deletion bgpd/bgp_zebra.c
Original file line number Diff line number Diff line change
Expand Up @@ -3235,7 +3235,7 @@ static int bgp_zebra_process_srv6_locator_delete(ZAPI_CALLBACK_ARGS)
if (prefix_match((struct prefix *)&loc.prefix,
(struct prefix *)&tmp_prefi)) {
listnode_delete(bgp->srv6_functions, func);
XFREE(MTYPE_BGP_SRV6_FUNCTION, func);
srv6_function_free(func);
}
}

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2 changes: 2 additions & 0 deletions bgpd/bgpd.c
Original file line number Diff line number Diff line change
Expand Up @@ -1428,7 +1428,9 @@ static void bgp_srv6_init(struct bgp *bgp)
bgp->srv6_enabled = false;
memset(bgp->srv6_locator_name, 0, sizeof(bgp->srv6_locator_name));
bgp->srv6_locator_chunks = list_new();
bgp->srv6_locator_chunks->del = srv6_locator_chunk_list_free;
bgp->srv6_functions = list_new();
bgp->srv6_functions->del = (void (*)(void *))srv6_function_free;
}

static void bgp_srv6_cleanup(struct bgp *bgp)
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3 changes: 3 additions & 0 deletions bgpd/bgpd.h
Original file line number Diff line number Diff line change
Expand Up @@ -2721,6 +2721,9 @@ extern bool bgp_path_attribute_discard(struct peer *peer, char *buf,
size_t size);
extern bool bgp_path_attribute_treat_as_withdraw(struct peer *peer, char *buf,
size_t size);

extern void srv6_function_free(struct bgp_srv6_function *func);

#ifdef _FRR_ATTRIBUTE_PRINTFRR
/* clang-format off */
#pragma FRR printfrr_ext "%pBP" (struct peer *)
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2 changes: 1 addition & 1 deletion lib/srv6.c
Original file line number Diff line number Diff line change
Expand Up @@ -108,7 +108,7 @@ const char *seg6local_context2str(char *str, size_t size,
}
}

static void srv6_locator_chunk_list_free(void *data)
void srv6_locator_chunk_list_free(void *data)
{
struct srv6_locator_chunk *chunk = data;

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1 change: 1 addition & 0 deletions lib/srv6.h
Original file line number Diff line number Diff line change
Expand Up @@ -252,6 +252,7 @@ int snprintf_seg6_segs(char *str,
extern struct srv6_locator *srv6_locator_alloc(const char *name);
extern struct srv6_locator_chunk *srv6_locator_chunk_alloc(void);
extern void srv6_locator_free(struct srv6_locator *locator);
extern void srv6_locator_chunk_list_free(void *data);
extern void srv6_locator_chunk_free(struct srv6_locator_chunk **chunk);
json_object *srv6_locator_chunk_json(const struct srv6_locator_chunk *chunk);
json_object *srv6_locator_json(const struct srv6_locator *loc);
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