linux-kernel - [PATCH V2 1/2] OPP: debugfs: Fix warning with W=1 builds

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Message-Id: <ab75239d2280e506e5b9386b8aeb9edf97cd3294.1709551295.git.viresh.kumar@linaro.org>
Date: Mon,  4 Mar 2024 16:52:38 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Viresh Kumar <vireshk@...nel.org>,
	Nishanth Menon <nm@...com>,
	Stephen Boyd <sboyd@...nel.org>
Cc: Viresh Kumar <viresh.kumar@...aro.org>,
	linux-pm@...r.kernel.org,
	Vincent Guittot <vincent.guittot@...aro.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Dhruva Gole <d-gole@...com>,
	kernel test robot <lkp@...el.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH V2 1/2] OPP: debugfs: Fix warning with W=1 builds

We currently get the following warning:

debugfs.c:105:54: error: '%d' directive output may be truncated writing between 1 and 11 bytes into a region of size 8 [-Werror=format-truncation=]
                 snprintf(name, sizeof(name), "supply-%d", i);
                                                      ^~
debugfs.c:105:46: note: directive argument in the range [-2147483644, 2147483646]
                 snprintf(name, sizeof(name), "supply-%d", i);
                                              ^~~~~~~~~~~
debugfs.c:105:17: note: 'snprintf' output between 9 and 19 bytes into a destination of size 15
                 snprintf(name, sizeof(name), "supply-%d", i);

Fix this and another potential issues it by allocating larger arrays.
Use the exact string format to allocate the arrays without getting into
these issues again.

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202402141313.81ltVF5g-lkp@intel.com/
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
V2: Use string name while allocating memory for the array to fix potential
issues later on.

 drivers/opp/debugfs.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/opp/debugfs.c b/drivers/opp/debugfs.c
index ec030b19164a..27c3748347af 100644
--- a/drivers/opp/debugfs.c
+++ b/drivers/opp/debugfs.c
@@ -56,11 +56,11 @@ static void opp_debug_create_bw(struct dev_pm_opp *opp,
 				struct dentry *pdentry)
 {
 	struct dentry *d;
-	char name[20];
+	char name[] = "icc-path-XXXXXXXXXX"; /* Integers can take 10 chars max */
 	int i;
 
 	for (i = 0; i < opp_table->path_count; i++) {
-		snprintf(name, sizeof(name), "icc-path-%.1d", i);
+		snprintf(name, sizeof(name), "icc-path-%d", i);
 
 		/* Create per-path directory */
 		d = debugfs_create_dir(name, pdentry);
@@ -78,7 +78,7 @@ static void opp_debug_create_clks(struct dev_pm_opp *opp,
 				  struct opp_table *opp_table,
 				  struct dentry *pdentry)
 {
-	char name[12];
+	char name[] = "rate_hz_XXXXXXXXXX"; /* Integers can take 10 chars max */
 	int i;
 
 	if (opp_table->clk_count == 1) {
@@ -100,7 +100,7 @@ static void opp_debug_create_supplies(struct dev_pm_opp *opp,
 	int i;
 
 	for (i = 0; i < opp_table->regulator_count; i++) {
-		char name[15];
+		char name[] = "supply-XXXXXXXXXX"; /* Integers can take 10 chars max */
 
 		snprintf(name, sizeof(name), "supply-%d", i);
 
-- 
2.31.1.272.g89b43f80a514