linux-kernel - [PATCH] edac: Use scnprintf() for safer buffer handling

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Message-ID: <20250713025744.1091545-1-haoranwangsec@gmail.com>
Date: Sun, 13 Jul 2025 10:57:44 +0800
From: Wang Haoran <haoranwangsec@...il.com>
To: tony.luck@...el.com,
	bp@...en8.de
Cc: james.morse@....com,
	mchehab@...nel.org,
	rric@...nel.org,
	linux-edac@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Wang Haoran <haoranwangsec@...il.com>
Subject: [PATCH] edac: Use scnprintf() for safer buffer handling

snprintf() is fragile when its return value will be used to append additional data to a buffer. Use scnprintf() instead.

Signed-off-by: Wang Haoran (Vul337) <haoranwangsec@...il.com>
---
 drivers/edac/skx_common.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/edac/skx_common.c b/drivers/edac/skx_common.c
index c9ade45c1a99..39c733dbc5b9 100644
--- a/drivers/edac/skx_common.c
+++ b/drivers/edac/skx_common.c
@@ -670,12 +670,12 @@ static void skx_mce_output_error(struct mem_ctl_info *mci,
 	}
 
 	if (res->decoded_by_adxl) {
-		len = snprintf(skx_msg, MSG_SIZE, "%s%s err_code:0x%04x:0x%04x %s",
+		len = scnprintf(skx_msg, MSG_SIZE, "%s%s err_code:0x%04x:0x%04x %s",
 			 overflow ? " OVERFLOW" : "",
 			 (uncorrected_error && recoverable) ? " recoverable" : "",
 			 mscod, errcode, adxl_msg);
 	} else {
-		len = snprintf(skx_msg, MSG_SIZE,
+		len = scnprintf(skx_msg, MSG_SIZE,
 			 "%s%s err_code:0x%04x:0x%04x ProcessorSocketId:0x%x MemoryControllerId:0x%x PhysicalRankId:0x%x Row:0x%x Column:0x%x Bank:0x%x BankGroup:0x%x",
 			 overflow ? " OVERFLOW" : "",
 			 (uncorrected_error && recoverable) ? " recoverable" : "",
-- 
2.43.0