netdev - [PATCH net] pds_core: limit loop over fw name list

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Message-ID: <20250103195147.7408-1-shannon.nelson@amd.com>
Date: Fri, 3 Jan 2025 11:51:47 -0800
From: Shannon Nelson <shannon.nelson@....com>
To: <netdev@...r.kernel.org>, <davem@...emloft.net>, <kuba@...nel.org>,
	<edumazet@...gle.com>, <pabeni@...hat.com>, <andrew+netdev@...n.ch>,
	<jacob.e.keller@...el.com>
CC: <brett.creeley@....com>, Shannon Nelson <shannon.nelson@....com>
Subject: [PATCH net] pds_core: limit loop over fw name list

Add an array size limit to the for-loop to be sure we don't try
to reference a fw_version string off the end of the fw info names
array.  We know that our firmware only has a limited number
of firmware slot names, but we shouldn't leave this unchecked.

Fixes: 45d76f492938 ("pds_core: set up device and adminq")
Signed-off-by: Shannon Nelson <shannon.nelson@....com>
---
 drivers/net/ethernet/amd/pds_core/devlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/amd/pds_core/devlink.c b/drivers/net/ethernet/amd/pds_core/devlink.c
index 2681889162a2..44971e71991f 100644
--- a/drivers/net/ethernet/amd/pds_core/devlink.c
+++ b/drivers/net/ethernet/amd/pds_core/devlink.c
@@ -118,7 +118,7 @@ int pdsc_dl_info_get(struct devlink *dl, struct devlink_info_req *req,
 	if (err && err != -EIO)
 		return err;
 
-	listlen = fw_list.num_fw_slots;
+	listlen = min(fw_list.num_fw_slots, ARRAY_SIZE(fw_list.fw_names));
 	for (i = 0; i < listlen; i++) {
 		if (i < ARRAY_SIZE(fw_slotnames))
 			strscpy(buf, fw_slotnames[i], sizeof(buf));
-- 
2.17.1