linux-kernel - [PATCH v2 1/1] fpga: m10bmc-sec: Fix probe rollback

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Date:   Wed, 14 Dec 2022 16:49:52 +0200
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Russ Weight <russell.h.weight@...el.com>,
        Moritz Fischer <mdf@...nel.org>, Wu Hao <hao.wu@...el.com>,
        Xu Yilun <yilun.xu@...el.com>, Tom Rix <trix@...hat.com>,
        linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Matthew Gerlach <matthew.gerlach@...ux.intel.com>,
        Marco Pagani <marpagan@...hat.com>
Subject: [PATCH v2 1/1] fpga: m10bmc-sec: Fix probe rollback

Handle probe error rollbacks properly to avoid leaks.

Fixes: 5cd339b370e2 ("fpga: m10bmc-sec: add max10 secure update functions")
Reviewed-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
Reviewed-by: Russ Weight <russell.h.weight@...el.com>
Reviewed-by: Marco Pagani <marpagan@...hat.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
I don't know if the previous one fell through cracks so resending this.

v2:
- Resending v1 with Marco's Rev-by

 drivers/fpga/intel-m10-bmc-sec-update.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/fpga/intel-m10-bmc-sec-update.c b/drivers/fpga/intel-m10-bmc-sec-update.c
index 79d48852825e..03f1bd81c434 100644
--- a/drivers/fpga/intel-m10-bmc-sec-update.c
+++ b/drivers/fpga/intel-m10-bmc-sec-update.c
@@ -574,20 +574,27 @@ static int m10bmc_sec_probe(struct platform_device *pdev)
 	len = scnprintf(buf, SEC_UPDATE_LEN_MAX, "secure-update%d",
 			sec->fw_name_id);
 	sec->fw_name = kmemdup_nul(buf, len, GFP_KERNEL);
-	if (!sec->fw_name)
-		return -ENOMEM;
+	if (!sec->fw_name) {
+		ret = -ENOMEM;
+		goto fw_name_fail;
+	}
 
 	fwl = firmware_upload_register(THIS_MODULE, sec->dev, sec->fw_name,
 				       &m10bmc_ops, sec);
 	if (IS_ERR(fwl)) {
 		dev_err(sec->dev, "Firmware Upload driver failed to start\n");
-		kfree(sec->fw_name);
-		xa_erase(&fw_upload_xa, sec->fw_name_id);
-		return PTR_ERR(fwl);
+		ret = PTR_ERR(fwl);
+		goto fw_uploader_fail;
 	}
 
 	sec->fwl = fwl;
 	return 0;
+
+fw_uploader_fail:
+	kfree(sec->fw_name);
+fw_name_fail:
+	xa_erase(&fw_upload_xa, sec->fw_name_id);
+	return ret;
 }
 
 static int m10bmc_sec_remove(struct platform_device *pdev)
-- 
2.30.2