tree 55c13be43e0d6a09c50090d516f251f99cdbbfa6
parent 75c1edf23b95a9c66923d9269d8e86e4dbde151f
author liuyacan <liuyacan@corp.netease.com> 1653285056 +0800
committer David S. Miller <davem@davemloft.net> 1653296913 +0100

net/smc: fix listen processing for SMC-Rv2

In the process of checking whether RDMAv2 is available, the current
implementation first sets ini->smcrv2.ib_dev_v2, and then allocates
smc buf desc, but the latter may fail. Unfortunately, the caller
will only check the former. In this case, a NULL pointer reference
will occur in smc_clc_send_confirm_accept() when accessing
conn->rmb_desc.

This patch does two things:
1. Use the return code to determine whether V2 is available.
2. If the return code is NODEV, continue to check whether V1 is
available.

Fixes: e49300a6bf62 ("net/smc: add listen processing for SMC-Rv2")
Signed-off-by: liuyacan <liuyacan@corp.netease.com>
Signed-off-by: David S. Miller <davem@davemloft.net>