linux-kernel - [PATCH 5.17 079/298] net/smc: set ini->smcrv2.ib_dev

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Date:   Mon, 13 Jun 2022 12:09:33 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, liuyacan <liuyacan@...p.netease.com>,
        Karsten Graul <kgraul@...ux.ibm.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.17 079/298] net/smc: set ini->smcrv2.ib_dev_v2 to NULL if SMC-Rv2 is unavailable

From: liuyacan <liuyacan@...p.netease.com>

[ 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@...p.netease.com>
Reviewed-by: Karsten Graul <kgraul@...ux.ibm.com>
Link: https://lore.kernel.org/r/20220525085408.812273-1-liuyacan@corp.netease.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/smc/af_smc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index b9fe31834354..4bc6b16669f3 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;
 }
 
-- 
2.35.1