[PATCH net v2 0/2] smsc95xx: fix smsc95xx_bind

[PATCH net v2 0/2] smsc95xx: fix smsc95xx_bind

[Andre Edich]

The patchset fixes two problems in the function smsc95xx_bind:
 - return of false success
 - memory leak

Changes in v2:
- added "Fixes" tags to both patches

Andre Edich (2):
  smsc95xx: check return value of smsc95xx_reset
  smsc95xx: avoid memory leak in smsc95xx_bind

 drivers/net/usb/smsc95xx.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

-- 
2.27.0

[PATCH net v2 1/2] smsc95xx: check return value of smsc95xx_reset

[Andre Edich]

The return value of the function smsc95xx_reset() must be checked
to avoid returning false success from the function smsc95xx_bind().

Fixes: 2f7ca802bdae2 ("net: Add SMSC LAN9500 USB2.0 10/100 ethernet adapter driver")
Signed-off-by: Andre Edich <andre.edich@microchip.com>
Signed-off-by: Parthiban Veerasooran <Parthiban.Veerasooran@microchip.com>
---
 drivers/net/usb/smsc95xx.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
index 3cf4dc3433f9..eb404bb74e18 100644
--- a/drivers/net/usb/smsc95xx.c
+++ b/drivers/net/usb/smsc95xx.c
@@ -1287,6 +1287,8 @@ static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
 
 	/* Init all registers */
 	ret = smsc95xx_reset(dev);
+	if (ret)
+		goto free_pdata;
 
 	/* detect device revision as different features may be available */
 	ret = smsc95xx_read_reg(dev, ID_REV, &val);
@@ -1317,6 +1319,10 @@ static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
 	schedule_delayed_work(&pdata->carrier_check, CARRIER_CHECK_DELAY);
 
 	return 0;
+
+free_pdata:
+	kfree(pdata);
+	return ret;
 }
 
 static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
-- 
2.27.0

[PATCH net v2 2/2] smsc95xx: avoid memory leak in smsc95xx_bind

[Andre Edich]

In a case where the ID_REV register read is failed, the memory for a
private data structure has to be freed before returning error from the
function smsc95xx_bind.

Fixes: bbd9f9ee69242 ("smsc95xx: add wol support for more frame types")
Signed-off-by: Andre Edich <andre.edich@microchip.com>
Signed-off-by: Parthiban Veerasooran <Parthiban.Veerasooran@microchip.com>
---
 drivers/net/usb/smsc95xx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
index eb404bb74e18..bb4ccbda031a 100644
--- a/drivers/net/usb/smsc95xx.c
+++ b/drivers/net/usb/smsc95xx.c
@@ -1293,7 +1293,8 @@ static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
 	/* detect device revision as different features may be available */
 	ret = smsc95xx_read_reg(dev, ID_REV, &val);
 	if (ret < 0)
-		return ret;
+		goto free_pdata;
+
 	val >>= 16;
 	pdata->chip_id = val;
 	pdata->mdix_ctrl = get_mdix_status(dev->net);
-- 
2.27.0

Re: [PATCH net v2 0/2] smsc95xx: fix smsc95xx_bind

[David Miller]

From: Andre Edich <andre.edich@microchip.com>
Date: Mon, 6 Jul 2020 10:39:33 +0200

> The patchset fixes two problems in the function smsc95xx_bind:
>  - return of false success
>  - memory leak
> 
> Changes in v2:
> - added "Fixes" tags to both patches

Series applied, thank you.