linux-kernel - [PATCH v2] staging: greybus: audio: avoid snprintf truncation warnings

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Message-ID: <20251229161346.188805-1-sun.jian.kdev@gmail.com>
Date: Tue, 30 Dec 2025 00:13:46 +0800
From: Sun Jian <sun.jian.kdev@...il.com>
To: Vaibhav Agarwal <vaibhav.sr@...il.com>,
	Johan Hovold <johan@...nel.org>
Cc: Mark Greer <mgreer@...malcreek.com>,
	Alex Elder <elder@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	David Laight <david.laight.linux@...il.com>,
	greybus-dev@...ts.linaro.org,
	linux-staging@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Sun Jian <sun.jian.kdev@...il.com>
Subject: [PATCH v2] staging: greybus: audio: avoid snprintf truncation warnings

W=1 reports possible truncation when formatting widget/control names
with snprintf() and a %s argument. Use a small helper and hide the %s
pointer from the compiler's truncation analysis via OPTIMIZER_HIDE_VAR(),
while keeping the existing snprintf() formatting.

No functional change intended.

Signed-off-by: Sun Jian <sun.jian.kdev@...il.com>
---
 drivers/staging/greybus/audio_topology.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/greybus/audio_topology.c b/drivers/staging/greybus/audio_topology.c
index 76146f91cddc..4293ab899390 100644
--- a/drivers/staging/greybus/audio_topology.c
+++ b/drivers/staging/greybus/audio_topology.c
@@ -1087,7 +1087,8 @@ static int gbaudio_tplg_create_widget(struct gbaudio_module_info *module,
 
 	/* Prefix dev_id to widget control_name */
 	strscpy(temp_name, w->name, sizeof(temp_name));
-	snprintf(w->name, sizeof(w->name), "GB %d %s", module->dev_id, temp_name);
+	scnprintf(w->name, sizeof(w->name), "GB %d ", module->dev_id);
+	strlcat(w->name, temp_name, sizeof(w->name));
 
 	switch (w->type) {
 	case snd_soc_dapm_spk:
@@ -1169,8 +1170,8 @@ static int gbaudio_tplg_process_kcontrols(struct gbaudio_module_info *module,
 		control->id = curr->id;
 		/* Prefix dev_id to widget_name */
 		strscpy(temp_name, curr->name, sizeof(temp_name));
-		snprintf(curr->name, sizeof(curr->name), "GB %d %s", module->dev_id,
-			 temp_name);
+		scnprintf(curr->name, sizeof(curr->name), "GB %d ", module->dev_id);
+		strlcat(curr->name, temp_name, sizeof(curr->name));
 		control->name = curr->name;
 		if (curr->info.type == GB_AUDIO_CTL_ELEM_TYPE_ENUMERATED) {
 			struct gb_audio_enumerated *gbenum =
-- 
2.43.0