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lib: fix BFD crash on interface removal

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- Handle badly formatted messages (don't set `ifp` in that case)
- Handle unread messages (e.g. when family is not don't trigger `assert`)

Signed-off-by: Rafael Zalamena <rzalamena@opensourcerouting.org>
This commit is contained in:
Rafael Zalamena 2021-04-14 15:28:09 -03:00
parent 1ff339ac05
commit 9c39d19742
1 changed files with 19 additions and 9 deletions
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28
lib/bfd.c
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@ -237,7 +237,7 @@ struct interface *bfd_get_peer_info(struct stream *s, struct prefix *dp,
memset(sp, 0, sizeof(*sp));
/* Get interface index. */
ifindex = stream_getl(s);
STREAM_GETL(s, ifindex);
/* Lookup index. */
if (ifindex != 0) {
@ -252,25 +252,28 @@ struct interface *bfd_get_peer_info(struct stream *s, struct prefix *dp,
}
/* Fetch destination address. */
dp->family = stream_getc(s);
STREAM_GETC(s, dp->family);
plen = prefix_blen(dp);
stream_get(&dp->u.prefix, s, plen);
dp->prefixlen = stream_getc(s);
STREAM_GET(&dp->u.prefix, s, plen);
STREAM_GETC(s, dp->prefixlen);
/* Get BFD status. */
*status = stream_getl(s);
STREAM_GETL(s, (*status));
sp->family = stream_getc(s);
STREAM_GETC(s, sp->family);
plen = prefix_blen(sp);
stream_get(&sp->u.prefix, s, plen);
sp->prefixlen = stream_getc(s);
STREAM_GET(&sp->u.prefix, s, plen);
STREAM_GETC(s, sp->prefixlen);
local_remote_cbit = stream_getc(s);
STREAM_GETC(s, local_remote_cbit);
if (remote_cbit)
*remote_cbit = local_remote_cbit;
return ifp;
stream_failure:
return NULL;
}
/*
@ -1094,6 +1097,13 @@ static int zclient_bfd_session_update(ZAPI_CALLBACK_ARGS)
ifp = bfd_get_peer_info(zclient->ibuf, &dp, &sp, &state, &remote_cbit,
vrf_id);
/*
* When interface lookup fails or an invalid stream is read, we must
* not proceed otherwise it will trigger an assertion while checking
* family type below.
*/
if (dp.family == 0 || sp.family == 0)
return 0;
if (bsglobal.debugging) {
ifstr[0] = 0;