1 files changed, 14 insertions, 7 deletions

diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c
index 5e6a0cef2a06..32b711723f2a 100644
--- a/drivers/hid/hid-lg4ff.c
+++ b/drivers/hid/hid-lg4ff.c
@@ -823,7 +823,7 @@ static ssize_t lg4ff_alternate_modes_show(struct device *dev, struct device_attr
 	for (i = 0; i < LG4FF_MODE_MAX_IDX; i++) {
 		if (entry->wdata.alternate_modes & BIT(i)) {
 			/* Print tag and full name */
-			count += scnprintf(buf + count, PAGE_SIZE - count, "%s: %s",
+			count += sysfs_emit_at(buf, count, "%s: %s",
 					   lg4ff_alternate_modes[i].tag,
 					   !lg4ff_alternate_modes[i].product_id ? entry->wdata.real_name : lg4ff_alternate_modes[i].name);
 			if (count >= PAGE_SIZE - 1)
@@ -832,9 +832,9 @@ static ssize_t lg4ff_alternate_modes_show(struct device *dev, struct device_attr
 			/* Mark the currently active mode with an asterisk */
 			if (lg4ff_alternate_modes[i].product_id == entry->wdata.product_id ||
 			    (lg4ff_alternate_modes[i].product_id == 0 && entry->wdata.product_id == entry->wdata.real_product_id))
-				count += scnprintf(buf + count, PAGE_SIZE - count, " *\n");
+				count += sysfs_emit_at(buf, count, " *\n");
 			else
-				count += scnprintf(buf + count, PAGE_SIZE - count, "\n");
+				count += sysfs_emit_at(buf, count, "\n");
 
 			if (count >= PAGE_SIZE - 1)
 				return count;
@@ -872,6 +872,12 @@ static ssize_t lg4ff_alternate_modes_store(struct device *dev, struct device_att
 		return -ENOMEM;
 
 	i = strlen(lbuf);
+
+	if (i == 0) {
+		kfree(lbuf);
+		return -EINVAL;
+	}
+
 	if (lbuf[i-1] == '\n') {
 		if (i == 1) {
 			kfree(lbuf);
@@ -950,7 +956,7 @@ static ssize_t lg4ff_combine_show(struct device *dev, struct device_attribute *a
 		return 0;
 	}
 
-	count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->wdata.combine);
+	count = sysfs_emit(buf, "%u\n", entry->wdata.combine);
 	return count;
 }
 
@@ -1003,7 +1009,7 @@ static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *att
 		return 0;
 	}
 
-	count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->wdata.range);
+	count = sysfs_emit(buf, "%u\n", entry->wdata.range);
 	return count;
 }
 
@@ -1067,7 +1073,7 @@ static ssize_t lg4ff_real_id_show(struct device *dev, struct device_attribute *a
 		return 0;
 	}
 
-	count = scnprintf(buf, PAGE_SIZE, "%s: %s\n", entry->wdata.real_tag, entry->wdata.real_name);
+	count = sysfs_emit(buf, "%s: %s\n", entry->wdata.real_tag, entry->wdata.real_name);
 	return count;
 }
 
@@ -1344,7 +1350,8 @@ int lg4ff_init(struct hid_device *hid)
 
 	/* Initialize device properties */
 	if (mmode_ret == LG4FF_MMODE_IS_MULTIMODE) {
-		BUG_ON(mmode_idx == -1);
+		if (WARN_ON(mmode_idx == -1))
+			return -EINVAL;
 		mmode_wheel = &lg4ff_multimode_wheels[mmode_idx];
 	}
 	lg4ff_init_wheel_data(&entry->wdata, &lg4ff_devices[i], mmode_wheel, real_product_id);