linux-kernel - [PATCH v4 1/2] RDMA/hfi1: Fix error return code in parse_platform

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Date:   Tue, 29 Nov 2022 10:04:18 +0800
From:   Wang Yufen <wangyufen@...wei.com>
To:     <bvanassche@....org>, <jgg@...pe.ca>, <leon@...nel.org>,
        <dennis.dalessandro@...nelisnetworks.com>
CC:     <linux-rdma@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <andriy.shevchenko@...ux.intel.com>, <bart.vanassche@....com>,
        <easwar.hariharan@...el.com>, Wang Yufen <wangyufen@...wei.com>
Subject: [PATCH v4 1/2] RDMA/hfi1: Fix error return code in parse_platform_config()

In the previous while loop, "ret" may be assigned zero, so the error
return code may be incorrectly set to 0 instead of -EINVAL.

Fixes: 97167e813415 ("staging/rdma/hfi1: Tune for unknown channel if configuration file is absent")
Signed-off-by: Wang Yufen <wangyufen@...wei.com>
---
 drivers/infiniband/hw/hfi1/firmware.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/hfi1/firmware.c b/drivers/infiniband/hw/hfi1/firmware.c
index 1d77514..9a08c1a 100644
--- a/drivers/infiniband/hw/hfi1/firmware.c
+++ b/drivers/infiniband/hw/hfi1/firmware.c
@@ -1730,7 +1730,7 @@ int parse_platform_config(struct hfi1_devdata *dd)
 	u32 *ptr = NULL;
 	u32 header1 = 0, header2 = 0, magic_num = 0, crc = 0, file_length = 0;
 	u32 record_idx = 0, table_type = 0, table_length_dwords = 0;
-	int ret = -EINVAL; /* assume failure */
+	int ret;
 
 	/*
 	 * For integrated devices that did not fall back to the default file,
@@ -1743,6 +1743,7 @@ int parse_platform_config(struct hfi1_devdata *dd)
 
 	if (!dd->platform_config.data) {
 		dd_dev_err(dd, "%s: Missing config file\n", __func__);
+		ret = -EINVAL;
 		goto bail;
 	}
 	ptr = (u32 *)dd->platform_config.data;
@@ -1751,6 +1752,7 @@ int parse_platform_config(struct hfi1_devdata *dd)
 	ptr++;
 	if (magic_num != PLATFORM_CONFIG_MAGIC_NUM) {
 		dd_dev_err(dd, "%s: Bad config file\n", __func__);
+		ret = -EINVAL;
 		goto bail;
 	}
 
@@ -1774,6 +1776,7 @@ int parse_platform_config(struct hfi1_devdata *dd)
 	if (file_length > dd->platform_config.size) {
 		dd_dev_info(dd, "%s:File claims to be larger than read size\n",
 			    __func__);
+		ret = -EINVAL;
 		goto bail;
 	} else if (file_length < dd->platform_config.size) {
 		dd_dev_info(dd,
@@ -1794,6 +1797,7 @@ int parse_platform_config(struct hfi1_devdata *dd)
 			dd_dev_err(dd, "%s: Failed validation at offset %ld\n",
 				   __func__, (ptr - (u32 *)
 					      dd->platform_config.data));
+			ret = -EINVAL;
 			goto bail;
 		}
 
@@ -1837,6 +1841,7 @@ int parse_platform_config(struct hfi1_devdata *dd)
 					   __func__, table_type,
 					   (ptr - (u32 *)
 					    dd->platform_config.data));
+				ret = -EINVAL;
 				goto bail; /* We don't trust this file now */
 			}
 			pcfgcache->config_tables[table_type].table = ptr;
@@ -1856,6 +1861,7 @@ int parse_platform_config(struct hfi1_devdata *dd)
 					   __func__, table_type,
 					   (ptr -
 					    (u32 *)dd->platform_config.data));
+				ret = -EINVAL;
 				goto bail; /* We don't trust this file now */
 			}
 			pcfgcache->config_tables[table_type].table_metadata =
-- 
1.8.3.1