[PATCH 4/5] hwmon: Reject truncated attribute names

[Jihong Min]

Large channel numbers can produce truncated or conflicting attribute
names. Return -EOVERFLOW if a generated name does not fit its buffer.

Assisted-by: Codex:gpt-6-astra
Signed-off-by: Jihong Min <hurryman2212@xxxxxxxxx>
---
 drivers/hwmon/hwmon.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
index bed16cfd4f1c..288f356980e4 100644
--- a/drivers/hwmon/hwmon.c
+++ b/drivers/hwmon/hwmon.c
@@ -553,8 +553,12 @@ static const struct attribute *hwmon_genattr(const void *drvdata,
 	if (type == hwmon_chip) {
 		name = template;
 	} else {
-		scnprintf(hattr->name, sizeof(hattr->name), template,
-			  index + hwmon_attr_base(type));
+		if (snprintf(hattr->name, sizeof(hattr->name), template,
+			     index + hwmon_attr_base(type)) >=
+		    sizeof(hattr->name)) {
+			kfree(hattr);
+			return ERR_PTR(-EOVERFLOW);
+		}
 		name = hattr->name;
 	}