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