From d163f89e14ea265cd3bbd310276a8ed5ac1fb2ae Mon Sep 17 00:00:00 2001 From: Keelan10 Date: Thu, 12 Oct 2023 18:04:52 +0400 Subject: [PATCH] nhrpd: Fix nhrp_peer leak - Addressed memory leak by removing `&c->peer_notifier` from the notifier list on termination. Retaining it caused the notifier list to stay active, preventing the deletion of `c->cur.peer` thereby causing a memory leak. - Reordered termination steps to call `vrf_terminate` before `nhrp_vc_terminate`, preventing a heap-use-after-free issue when `nhrp_vc_notify_del` is invoked in `nhrp_peer_check_delete`. - Added an if statement to avoid passing NULL as hash to `hash_release`, which leads to a SIGSEGV. The ASan leak log for reference: ``` *********************************************************************************** Address Sanitizer Error detected in nhrp_topo.test_nhrp_topo/r1.asan.nhrpd.20265 ================================================================= ==20265==ERROR: LeakSanitizer: detected memory leaks Direct leak of 112 byte(s) in 1 object(s) allocated from: #0 0x7f80270c9b40 in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdeb40) #1 0x7f8026ac1eb8 in qmalloc lib/memory.c:100 #2 0x560fd648f0a6 in nhrp_peer_create nhrpd/nhrp_peer.c:175 #3 0x7f8026a88d3f in hash_get lib/hash.c:147 #4 0x560fd6490a5d in nhrp_peer_get nhrpd/nhrp_peer.c:228 #5 0x560fd648a51a in nhrp_nhs_resolve_cb nhrpd/nhrp_nhs.c:297 #6 0x7f80266b000f in resolver_cb_literal lib/resolver.c:234 #7 0x7f8026b62e0e in event_call lib/event.c:1969 #8 0x7f8026aa5437 in frr_run lib/libfrr.c:1213 #9 0x560fd6488b4f in main nhrpd/nhrp_main.c:166 #10 0x7f8025eb2c86 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21c86) SUMMARY: AddressSanitizer: 112 byte(s) leaked in 1 allocation(s). *********************************************************************************** *********************************************************************************** Address Sanitizer Error detected in nhrp_topo.test_nhrp_topo/r2.asan.nhrpd.20400 ================================================================= ==20400==ERROR: LeakSanitizer: detected memory leaks Direct leak of 112 byte(s) in 1 object(s) allocated from: #0 0x7fb6e3ca5b40 in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdeb40) #1 0x7fb6e369deb8 in qmalloc lib/memory.c:100 #2 0x562652de40a6 in nhrp_peer_create nhrpd/nhrp_peer.c:175 #3 0x7fb6e3664d3f in hash_get lib/hash.c:147 #4 0x562652de5a5d in nhrp_peer_get nhrpd/nhrp_peer.c:228 #5 0x562652de1e8e in nhrp_packet_recvraw nhrpd/nhrp_packet.c:325 #6 0x7fb6e373ee0e in event_call lib/event.c:1969 #7 0x7fb6e3681437 in frr_run lib/libfrr.c:1213 #8 0x562652dddb4f in main nhrpd/nhrp_main.c:166 #9 0x7fb6e2a8ec86 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21c86) SUMMARY: AddressSanitizer: 112 byte(s) leaked in 1 allocation(s). *********************************************************************************** ``` Signed-off-by: Keelan Cannoo --- nhrpd/nhrp_cache.c | 2 ++ nhrpd/nhrp_main.c | 2 +- nhrpd/nhrp_peer.c | 3 ++- 3 files changed, 5 insertions(+), 2 deletions(-) diff --git a/nhrpd/nhrp_cache.c b/nhrpd/nhrp_cache.c index 1a11e0d98ba7..e0b8f7bf8888 100644 --- a/nhrpd/nhrp_cache.c +++ b/nhrpd/nhrp_cache.c @@ -70,6 +70,8 @@ static void nhrp_cache_free(struct nhrp_cache *c) notifier_call(&c->notifier_list, NOTIFY_CACHE_DELETE); assert(!notifier_active(&c->notifier_list)); hash_release(nifp->cache_hash, c); + if (c->cur.peer) + nhrp_peer_notify_del(c->cur.peer, &c->peer_notifier); nhrp_peer_unref(c->cur.peer); nhrp_peer_unref(c->new.peer); EVENT_OFF(c->t_timeout); diff --git a/nhrpd/nhrp_main.c b/nhrpd/nhrp_main.c index 593498ca1347..e401f21ed485 100644 --- a/nhrpd/nhrp_main.c +++ b/nhrpd/nhrp_main.c @@ -88,8 +88,8 @@ static void nhrp_request_stop(void) nhrp_zebra_terminate(); vici_terminate(); evmgr_terminate(); - nhrp_vc_terminate(); vrf_terminate(); + nhrp_vc_terminate(); debugf(NHRP_DEBUG_COMMON, "Done."); frr_fini(); diff --git a/nhrpd/nhrp_peer.c b/nhrpd/nhrp_peer.c index ffb6cf750643..ef92d81436f4 100644 --- a/nhrpd/nhrp_peer.c +++ b/nhrpd/nhrp_peer.c @@ -45,7 +45,8 @@ static void nhrp_peer_check_delete(struct nhrp_peer *p) EVENT_OFF(p->t_fallback); EVENT_OFF(p->t_timer); - hash_release(nifp->peer_hash, p); + if (nifp->peer_hash) + hash_release(nifp->peer_hash, p); nhrp_interface_notify_del(p->ifp, &p->ifp_notifier); nhrp_vc_notify_del(p->vc, &p->vc_notifier); XFREE(MTYPE_NHRP_PEER, p);