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zebra: zebra crash for zapi stream

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Issue:
If static route is created with a BGP route as nexthop, which
recursively resolves over 512 ECMP v6 nexthops, zapi nexthop encode
fails, as there is not enough memory allocated for stream. This causes
assert/core dump in zebra. Right now we allocate fixed memory
of ZEBRA_MAX_PACKET_SIZ size.

Fix:
1)Dynamically calculate required memory size for the stream
2)try to optimize memory usage

Testing:
No crash happens anymore with the fix
zebra: zebra crash for zapi stream

Issue:
If static route is created with a BGP route as nexthop, which
recursively resolves over 512 ECMP v6 nexthops, zapi nexthop encode
fails, as there is not enough memory allocated for stream. This causes
assert/core dump in zebra. Right now we allocate fixed memory
of ZEBRA_MAX_PACKET_SIZ size.

Fix:
1)Dynamically calculate required memory size for the stream
2)try to optimize memory usage

Testing:
No crash happens anymore with the fix
r1#
r1# sharp install routes 2100:cafe:: nexthop 2001:db8::1 1000
r1#

r2# conf
r2(config)# ipv6 route 2503:feca::100/128 2100:cafe::1
r2(config)# exit
r2#

Signed-off-by: Soumya Roy <souroy@nvidia.com>
This commit is contained in:
Soumya Roy 2025-03-14 21:56:48 +00:00
parent 4de0f16a89
commit 6fe9092eb3
1 changed files with 1 additions and 1 deletions
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2
zebra/zebra_rnh.c
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@ -1150,7 +1150,7 @@ int zebra_send_rnh_update(struct rnh *rnh, struct zserv *client,
re = rnh->state;
/* Get output stream. */
s = stream_new(ZEBRA_MAX_PACKET_SIZ);
s = stream_new_expandable(ZEBRA_MAX_PACKET_SIZ);
zclient_create_header(s, ZEBRA_NEXTHOP_UPDATE, vrf_id);