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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Johannes Berg <johannes.berg@intel.com>,
        Luca Coelho <luciano.coelho@intel.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 130/187] iwlwifi: mvm: fix RFH config command with >=10 CPUs
Date:   Thu,  4 Apr 2019 10:47:47 +0200
Message-Id: <20190404084609.332234205@linuxfoundation.org>
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4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit dbf592f3d14fb7d532cb7c820b1065cf33e02aaa ]

If we have >=10 (logical) CPUs, our command size exceeds the
internal buffer size and the command fails; fix that by using
IWL_HCMD_DFL_NOCOPY for the command that's allocated anyway.

While at it, also fix the leak of cmd, and use struct_size()
to calculate its size.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Fixes: 8edbfaa19835 ("iwlwifi: mvm: configure multi RX queue")
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/wireless/intel/iwlwifi/mvm/fw.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
index 16c6c7f921a8..8b7d70e3a379 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
@@ -132,13 +132,17 @@ static int iwl_send_rss_cfg_cmd(struct iwl_mvm *mvm)
 
 static int iwl_configure_rxq(struct iwl_mvm *mvm)
 {
-	int i, num_queues, size;
+	int i, num_queues, size, ret;
 	struct iwl_rfh_queue_config *cmd;
+	struct iwl_host_cmd hcmd = {
+		.id = WIDE_ID(DATA_PATH_GROUP, RFH_QUEUE_CONFIG_CMD),
+		.dataflags[0] = IWL_HCMD_DFL_NOCOPY,
+	};
 
 	/* Do not configure default queue, it is configured via context info */
 	num_queues = mvm->trans->num_rx_queues - 1;
 
-	size = sizeof(*cmd) + num_queues * sizeof(struct iwl_rfh_queue_data);
+	size = struct_size(cmd, data, num_queues);
 
 	cmd = kzalloc(size, GFP_KERNEL);
 	if (!cmd)
@@ -159,10 +163,14 @@ static int iwl_configure_rxq(struct iwl_mvm *mvm)
 		cmd->data[i].fr_bd_wid = cpu_to_le32(data.fr_bd_wid);
 	}
 
-	return iwl_mvm_send_cmd_pdu(mvm,
-				    WIDE_ID(DATA_PATH_GROUP,
-					    RFH_QUEUE_CONFIG_CMD),
-				    0, size, cmd);
+	hcmd.data[0] = cmd;
+	hcmd.len[0] = size;
+
+	ret = iwl_mvm_send_cmd(mvm, &hcmd);
+
+	kfree(cmd);
+
+	return ret;
 }
 
 static int iwl_mvm_send_dqa_cmd(struct iwl_mvm *mvm)
-- 
2.19.1