[PATCH AUTOSEL 5.0 064/262] mt76: fix a leaked reference by adding a missing of_node_put

Sasha Levin
2019-03-27T18:03:58Z

From: Wen Yang <wen.yang99@zte.com.cn>

[ Upstream commit 34e022d8b780a03902d82fb3997ba7c7b1f40c81 ]

The call to of_find_node_by_phandle returns a node pointer with refcount
incremented thus it must be explicitly decremented after the last
usage.

Detected by coccinelle with the following warnings:
./drivers/net/wireless/mediatek/mt76/eeprom.c:58:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 48, but without a corresponding object release within this function.
./drivers/net/wireless/mediatek/mt76/eeprom.c:61:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 48, but without a corresponding object release within this function.
./drivers/net/wireless/mediatek/mt76/eeprom.c:67:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 48, but without a corresponding object release within this function.
./drivers/net/wireless/mediatek/mt76/eeprom.c:70:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 48, but without a corresponding object release within this function.
./drivers/net/wireless/mediatek/mt76/eeprom.c:72:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 48, but without a corresponding object release within this function.

Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
Cc: Felix Fietkau <nbd@nbd.name>
Cc: Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-mediatek@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/mediatek/mt76/eeprom.c | 24 ++++++++++++++-------
1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/eeprom.c b/drivers/net/wireless/mediatek/mt76/eeprom.c
index 530e5593765c..a1529920d877 100644
--- a/drivers/net/wireless/mediatek/mt76/eeprom.c
+++ b/drivers/net/wireless/mediatek/mt76/eeprom.c
@@ -54,22 +54,30 @@ mt76_get_of_eeprom(struct mt76_dev *dev, int len)
part = np->name;

mtd = get_mtd_device_nm(part);
- if (IS_ERR(mtd))
- return PTR_ERR(mtd);
+ if (IS_ERR(mtd)) {
+ ret = PTR_ERR(mtd);
+ goto out_put_node;
+ }

- if (size <= sizeof(*list))
- return -EINVAL;
+ if (size <= sizeof(*list)) {
+ ret = -EINVAL;
+ goto out_put_node;
+ }

offset = be32_to_cpup(list);
ret = mtd_read(mtd, offset, len, &retlen, dev->eeprom.data);
put_mtd_device(mtd);
if (ret)
- return ret;
+ goto out_put_node;

- if (retlen < len)
- return -EINVAL;
+ if (retlen < len) {
+ ret = -EINVAL;
+ goto out_put_node;
+ }

- return 0;
+out_put_node:
+ of_node_put(np);
+ return ret;
#else
return -ENOENT;
#endif
--
2.19.1