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From: Dan Carpenter <dan.carpenter@oracle.com>
To: nbd@nbd.name
Cc: linux-wireless@vger.kernel.org, linux-mediatek@lists.infradead.org
Subject: [bug report] mt76: implement functions to get the response skb for MCU calls
Date: Fri, 8 Oct 2021 16:00:07 +0300	[thread overview]
Message-ID: <20211008130007.GA23161@kili> (raw)

Hello Felix Fietkau,

The patch ae5ad6272d25: "mt76: implement functions to get the
response skb for MCU calls" from Sep 30, 2020, leads to the following
Smatch static checker warning:

	drivers/net/wireless/mediatek/mt76/mt7921/mcu.c:1151 mt7921_mcu_get_eeprom()
	error: potentially dereferencing uninitialized 'skb'.

drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
    1136 int mt7921_mcu_get_eeprom(struct mt7921_dev *dev, u32 offset)
    1137 {
    1138         struct mt7921_mcu_eeprom_info req = {
    1139                 .addr = cpu_to_le32(round_down(offset, 16)),
    1140         };
    1141         struct mt7921_mcu_eeprom_info *res;
    1142         struct sk_buff *skb;
    1143         int ret;
    1144         u8 *buf;
    1145 
    1146         ret = mt76_mcu_send_and_get_msg(&dev->mt76, MCU_EXT_CMD_EFUSE_ACCESS, &req,
    1147                                         sizeof(req), true, &skb);

If mt76_mcu_send_and_get_msg() calls the dev->mcu_ops->mcu_send_msg()
then "skb" is not initialized.

    1148         if (ret)
    1149                 return ret;
    1150 
--> 1151         res = (struct mt7921_mcu_eeprom_info *)skb->data;
    1152         buf = dev->mt76.eeprom.data + le32_to_cpu(res->addr);
    1153         memcpy(buf, res->data, 16);
    1154         dev_kfree_skb(skb);
    1155 
    1156         return 0;
    1157 }

regards,
dan carpenter

_______________________________________________
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Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek

WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter@oracle.com>
To: nbd@nbd.name
Cc: linux-wireless@vger.kernel.org, linux-mediatek@lists.infradead.org
Subject: [bug report] mt76: implement functions to get the response skb for MCU calls
Date: Fri, 8 Oct 2021 16:00:07 +0300	[thread overview]
Message-ID: <20211008130007.GA23161@kili> (raw)

Hello Felix Fietkau,

The patch ae5ad6272d25: "mt76: implement functions to get the
response skb for MCU calls" from Sep 30, 2020, leads to the following
Smatch static checker warning:

	drivers/net/wireless/mediatek/mt76/mt7921/mcu.c:1151 mt7921_mcu_get_eeprom()
	error: potentially dereferencing uninitialized 'skb'.

drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
    1136 int mt7921_mcu_get_eeprom(struct mt7921_dev *dev, u32 offset)
    1137 {
    1138         struct mt7921_mcu_eeprom_info req = {
    1139                 .addr = cpu_to_le32(round_down(offset, 16)),
    1140         };
    1141         struct mt7921_mcu_eeprom_info *res;
    1142         struct sk_buff *skb;
    1143         int ret;
    1144         u8 *buf;
    1145 
    1146         ret = mt76_mcu_send_and_get_msg(&dev->mt76, MCU_EXT_CMD_EFUSE_ACCESS, &req,
    1147                                         sizeof(req), true, &skb);

If mt76_mcu_send_and_get_msg() calls the dev->mcu_ops->mcu_send_msg()
then "skb" is not initialized.

    1148         if (ret)
    1149                 return ret;
    1150 
--> 1151         res = (struct mt7921_mcu_eeprom_info *)skb->data;
    1152         buf = dev->mt76.eeprom.data + le32_to_cpu(res->addr);
    1153         memcpy(buf, res->data, 16);
    1154         dev_kfree_skb(skb);
    1155 
    1156         return 0;
    1157 }

regards,
dan carpenter

             reply	other threads:[~2021-10-08 13:00 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-08 13:00 Dan Carpenter [this message]
2021-10-08 13:00 ` [bug report] mt76: implement functions to get the response skb for MCU calls Dan Carpenter
2021-10-08 14:03 ` Johannes Berg
2021-10-08 14:03   ` Johannes Berg
2021-10-08 14:27   ` Dan Carpenter
2021-10-08 14:27     ` Dan Carpenter
2021-10-08 14:35     ` Dan Carpenter
2021-10-08 14:35       ` Dan Carpenter
2022-10-13 13:04     ` Dan Carpenter
2022-10-13 16:25       ` Lorenzo Bianconi
2022-10-14  7:30         ` Dan Carpenter
2022-10-14  8:11           ` Lorenzo Bianconi

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