Patch "wifi: mt76: mt7996: check return value before accessing free_block_num" has been added to the 6.2-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    wifi: mt76: mt7996: check return value before accessing free_block_num

to the 6.2-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     wifi-mt76-mt7996-check-return-value-before-accessing.patch
and it can be found in the queue-6.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 0f61c8efd3cec99981be8c50a0d454d9c2c95428
Author: Ryder Lee <ryder.lee@xxxxxxxxxxxx>
Date:   Sun Dec 4 05:33:18 2022 +0800

    wifi: mt76: mt7996: check return value before accessing free_block_num
    
    [ Upstream commit 783ef7da7a53c7ab98471f47fbabab6cf6f45c8f ]
    
    Check return value of mt7996_mcu_get_eeprom_free_block() first before
    accessing free_block_num.
    
    Fixes: 98686cd21624 ("wifi: mt76: mt7996: add driver for MediaTek Wi-Fi 7 (802.11be) devices")
    Signed-off-by: Ryder Lee <ryder.lee@xxxxxxxxxxxx>
    Signed-off-by: Felix Fietkau <nbd@xxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/eeprom.c b/drivers/net/wireless/mediatek/mt76/mt7996/eeprom.c
index b9f62bedbc485..5d8e0353627e1 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/eeprom.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/eeprom.c
@@ -65,17 +65,23 @@ static int mt7996_eeprom_load(struct mt7996_dev *dev)
 	} else {
 		u8 free_block_num;
 		u32 block_num, i;
+		u32 eeprom_blk_size = MT7996_EEPROM_BLOCK_SIZE;
 
-		/* TODO: check free block event */
-		mt7996_mcu_get_eeprom_free_block(dev, &free_block_num);
-		/* efuse info not enough */
+		ret = mt7996_mcu_get_eeprom_free_block(dev, &free_block_num);
+		if (ret < 0)
+			return ret;
+
+		/* efuse info isn't enough */
 		if (free_block_num >= 59)
 			return -EINVAL;
 
 		/* read eeprom data from efuse */
-		block_num = DIV_ROUND_UP(MT7996_EEPROM_SIZE, MT7996_EEPROM_BLOCK_SIZE);
-		for (i = 0; i < block_num; i++)
-			mt7996_mcu_get_eeprom(dev, i * MT7996_EEPROM_BLOCK_SIZE);
+		block_num = DIV_ROUND_UP(MT7996_EEPROM_SIZE, eeprom_blk_size);
+		for (i = 0; i < block_num; i++) {
+			ret = mt7996_mcu_get_eeprom(dev, i * eeprom_blk_size);
+			if (ret < 0)
+				return ret;
+		}
 	}
 
 	return mt7996_check_eeprom(dev);
diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
index efb245c8ac840..da72684e43083 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
@@ -2927,8 +2927,9 @@ int mt7996_mcu_get_eeprom(struct mt7996_dev *dev, u32 offset)
 	bool valid;
 	int ret;
 
-	ret = mt76_mcu_send_and_get_msg(&dev->mt76, MCU_WM_UNI_CMD_QUERY(EFUSE_CTRL), &req,
-					sizeof(req), true, &skb);
+	ret = mt76_mcu_send_and_get_msg(&dev->mt76,
+					MCU_WM_UNI_CMD_QUERY(EFUSE_CTRL),
+					&req, sizeof(req), true, &skb);
 	if (ret)
 		return ret;