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net80211: fix a NULL deref in ieee80211_sta_join1()
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Authored by bz on Jan 16 2024, 7:00 PM.
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Details

Summary

When ieee80211_sta_join1() gets an obss without ni_nt trying to lock
that will cause a NULL pointer deref. Check for the table to be
valid and deal with the obss node accordingly.

This can happen if sta_newstate() calls ieee80211_reset_bss() for
nstate == INIT and ostate != INIT. ieee80211_reset_bss() itself
calls ieee80211_node_table_reset() which calls node_reclaim()
which ends up in ieee80211_del_node_nt() which does remove the
node from the table and sets ni_table to NULL.
That node (former iv_bss) can then be returned as obss in the
(*iv_update_bss)() call in join1().

MFC after: 3 days

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rG FreeBSD src repository
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