lkml.org 
[lkml]   [2013]   [Nov]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] staging: gdm724x: fix leak at failure path in gdm_usb_probe()
Date
Error handling code in gdm_usb_probe() deallocates all resources,
but calls usb_get_dev(usbdev) and returns error code after that.

The patch fixes it and, by the way, several other issues:
- no need to use GFP_ATOMIC in probe();
- return -ENODEV instead of -1;
- kmalloc+memset -> kzalloc

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
---
drivers/staging/gdm724x/gdm_usb.c | 40 +++++++++++++++++----------------------
1 file changed, 17 insertions(+), 23 deletions(-)

diff --git a/drivers/staging/gdm724x/gdm_usb.c b/drivers/staging/gdm724x/gdm_usb.c
index 781134af69d1..33458a583142 100644
--- a/drivers/staging/gdm724x/gdm_usb.c
+++ b/drivers/staging/gdm724x/gdm_usb.c
@@ -830,24 +830,19 @@ static int gdm_usb_probe(struct usb_interface *intf, const struct usb_device_id

if (bInterfaceNumber > NETWORK_INTERFACE) {
pr_info("not a network device\n");
- return -1;
+ return -ENODEV;
}

- phy_dev = kmalloc(sizeof(struct phy_dev), GFP_ATOMIC);
- if (!phy_dev) {
- ret = -ENOMEM;
- goto out;
- }
+ phy_dev = kzalloc(sizeof(struct phy_dev), GFP_KERNEL);
+ if (!phy_dev)
+ return -ENOMEM;

- udev = kmalloc(sizeof(struct lte_udev), GFP_ATOMIC);
+ udev = kzalloc(sizeof(struct lte_udev), GFP_KERNEL);
if (!udev) {
ret = -ENOMEM;
- goto out;
+ goto err_udev;
}

- memset(phy_dev, 0, sizeof(struct phy_dev));
- memset(udev, 0, sizeof(struct lte_udev));
-
phy_dev->priv_dev = (void *)udev;
phy_dev->send_hci_func = gdm_usb_hci_send;
phy_dev->send_sdu_func = gdm_usb_sdu_send;
@@ -858,7 +853,7 @@ static int gdm_usb_probe(struct usb_interface *intf, const struct usb_device_id
ret = init_usb(udev);
if (ret < 0) {
pr_err("init_usb func failed\n");
- goto out;
+ goto err_init_usb;
}
udev->intf = intf;

@@ -875,23 +870,22 @@ static int gdm_usb_probe(struct usb_interface *intf, const struct usb_device_id
ret = request_mac_address(udev);
if (ret < 0) {
pr_err("request Mac address failed\n");
- goto out;
+ goto err_mac_address;
}

start_rx_proc(phy_dev);
-out:
-
- if (ret < 0) {
- kfree(phy_dev);
- if (udev) {
- release_usb(udev);
- kfree(udev);
- }
- }
-
usb_get_dev(usbdev);
usb_set_intfdata(intf, phy_dev);

+ return 0;
+
+err_mac_address:
+ release_usb(udev);
+err_init_usb:
+ kfree(udev);
+err_udev:
+ kfree(phy_dev);
+
return ret;
}

--
1.8.1.2


\
 
 \ /
  Last update: 2013-11-15 22:01    [W:0.049 / U:6.596 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site