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    Subject[PATCH 5.17 079/298] net/smc: set ini->smcrv2.ib_dev_v2 to NULL if SMC-Rv2 is unavailable
    Date
    From: liuyacan <liuyacan@corp.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@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>
    ---
    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


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