[SRU][J][PATCH 0/1] CVE-2024-36945

[Massimiliano Pellizzer]

BugLink: https://bugs.launchpad.net/bugs/2109601
https://ubuntu.com/security/CVE-2024-36945

[Impact]

net/smc: fix neighbour and rtable leak in smc_ib_find_route()

In smc_ib_find_route(), the neighbour found by neigh_lookup() and rtable
resolved by ip_route_output_flow() are not released or put before return.
It may cause the refcount leak, so fix it.


[Fix]

Cherry pick the fix commit in Jammy:
- 2ddc0dd7fec8 net/smc: fix neighbour and rtable leak in smc_ib_find_route()

[Test Plan]

Compile tested only.


[Where Problems Could Occur]

The fix affects the SMC-R RDMA route resolution subsystem.
An issue with this fix may lead to incorrect handling of
reference counting neighbor and routing table objects
during RDMA path establishment.
A user might experience problems such asfailed RDMA connection setups
resulting in fallback to TCP even on capable hardware.