mlxsw: spectrum_router: Fix handling of neighbour structure
__neigh_create function works in a different way than assumed. It passes "n" as a parameter to ndo_neigh_construct. But this "n" might be destroyed right away before __neigh_create() returns in case there is already another neighbour struct in the hashtable with the same dev and primary key. That is not expected by mlxsw_sp_router_neigh_construct() and the stored "n" points to freed memory, eventually leading to crash. Fix this by doing tight 1:1 coupling between neighbour struct and internal driver neigh_entry. That allows to narrow down the key in internal driver hashtable to do lookups by "n" only. Fixes: 6cf3c971 ("mlxsw: spectrum_router: Add private neigh table") Signed-off-by: NJiri Pirko <jiri@mellanox.com> Acked-by: NIdo Schimmel <idosch@mellanox.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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