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Differential D41903

ndp: cope with unresolved neighbours
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Authored by kp on Sep 18 2023, 5:03 PM.
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Reviewers
melifaro
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pfsense
network
Commits
rGa9326cd7656b: ndp: cope with unresolved neighbours
rG100bed131d76: ndp: cope with unresolved neighbours
rGb57df6fbcc48: ndp: cope with unresolved neighbours
Summary

If we've not (yet) resolved a neighbour nda_lladdr will be NULL, and
NLA_DATA_LEN(neigh->nda_lladdr) will dereference a NULL pointer.

Avoid that by checking nda_lladdr first, and only dereferencing if it's
not NULL.

Test case:
ping6 -c 1 <non-existant neighbour>
ndp -a

MFC after: 3 days
Sponsored by: Rubicon Communications, LLC ("Netgate")

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Repository
rG FreeBSD src repository
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Build Status
Buildable 53631
Build 50522: arc lint + arc unit

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PathSize
usr.sbin/
ndp/
7 lines

Diff 127507

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usr.sbin/ndp/ndp_netlink.c

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