Merge branch 'net-enetc-sr-iov-robustness-and-security-fixes'

Wei Fang says:

====================
net: enetc: SR-IOV robustness and security fixes

This patch series addresses a number of robustness, security, and
correctness issues in the ENETC driver's SR-IOV subsystem, focusing
primarily on the VF-to-PF mailbox communication path.

The series can be grouped into the following categories:

1. DoS and security fixes:
   - Prevent an unbounded loop DoS in the VF-to-PF message handler,
     which could be triggered by a malicious or misbehaving VF.
   - Fix a TOCTOU (Time-of-Check-Time-of-Use) race and add proper
     validation of VF MAC addresses to prevent spoofing or invalid
     configuration from being applied.

2. Race condition fixes:
   - Fix a race condition in VF MAC address configuration that could
     lead to inconsistent state between the VF request and PF
     application.
   - Fix a race condition during SR-IOV teardown that could cause
     VF->PF mailbox operations to time out, resulting in unnecessary
     errors during shutdown.

3. Memory safety fixes:
   - Fix a DMA write to freed memory in enetc_msg_free_mbx(), which
     could cause silent memory corruption or system instability.

4. Error handling and initialization fixes:
   - Fix missing error code propagation when pf->vf_state allocation
     fails, ensuring callers receive a proper errno instead of
     succeeding silently.
   - Fix incorrect mailbox message status values returned to VFs,
     which could cause VFs to misinterpret PF responses.
   - Fix initialization order to prevent the use of uninitialized
     resources during driver probe, which could cause undefined
     behavior on certain configurations.

5. Diagnostics improvement:
   - Add rate limiting to VF mailbox error messages to prevent log
     flooding in the presence of a misbehaving VF.

These fixes improve the overall stability and security of the ENETC
SR-IOV implementation, particularly in multi-tenant environments where
VFs may be assigned to untrusted guests.
====================

Link: https://patch.msgid.link/20260520064421.91569-1-wei.fang@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>