From: liuyacan <liuyacan@corp.netease.com>
Date: Wed, 25 May 2022 08:54:08 +0000 (+0800)
Subject: net/smc: set ini->smcrv2.ib_dev_v2 to NULL if SMC-Rv2 is unavailable
X-Git-Tag: v5.17.15~225
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d4057803a84112ffd17535fa535d74bf69c3b969;p=thirdparty%2Fkernel%2Fstable.git

net/smc: set ini->smcrv2.ib_dev_v2 to NULL if SMC-Rv2 is unavailable

[ Upstream commit b3b1a17538d3ef6a9667b2271216fd16d7678ab5 ]

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 and register rmb, but the latter may fail. In this case,
the pointer should be reset.

Fixes: e49300a6bf62 ("net/smc: add listen processing for SMC-Rv2")
Signed-off-by: liuyacan <liuyacan@corp.netease.com>
Reviewed-by: Karsten Graul <kgraul@linux.ibm.com>
Link: https://lore.kernel.org/r/20220525085408.812273-1-liuyacan@corp.netease.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index b9fe31834354d..4bc6b16669f35 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -1973,6 +1973,7 @@ static void smc_find_rdma_v2_device_serv(struct smc_sock *new_smc,
 
 not_found:
 	ini->smcr_version &= ~SMC_V2;
+	ini->smcrv2.ib_dev_v2 = NULL;
 	ini->check_smcrv2 = false;
 }