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Use the neighbour lock when copying the MAC address from the neighbour
data struct in dst_fetch_ha.
When not using the lock, it is possible for the function to race with
neigh_update(), causing it to copy an torn MAC address:
rdma_resolve_addr()
rdma_resolve_ip()
addr_resolve()
addr_resolve_neigh()
fetch_ha()
dst_fetch_ha()
memcpy(dev_addr->dst_dev_addr, n->ha, MAX_ADDR_LEN)
and
net_ioctl()
arp_ioctl()
arp_rec_delete()
arp_invalidate()
neigh_update()
__neigh_update()
memcpy(&neigh->ha, lladdr, dev->addr_len)
It is possible to provoke this error by calling rdma_resolve_addr() in a
tight loop, while deleting the corresponding ARP entry in another tight
loop.
Fixes: 51d45974515c ("infiniband: addr: Consolidate code to fetch neighbour hardware address from dst.")
Signed-off-by: Dag Moxnes <dag.moxnes@oracle.com>
Signed-off-by: Håkon Bugge <haakon.bugge@oracle.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
d8d9ec7dc5