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can: gs_usb: fixed disconnect bug by removing erroneous use of kfree() 

gs_destroy_candev() erroneously calls kfree() on a struct gs_can *, which is
allocated through alloc_candev() and should instead be freed using
free_candev() alone.

The inappropriate use of kfree() causes the kernel to hang when
gs_destroy_candev() is called.

Only the struct gs_usb * which is allocated through kzalloc() should be freed
using kfree() when the device is disconnected.

Signed-off-by: Maximilian Schneider <max@schneidersoft.net>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Maximilain Schneider 2016-02-23 01:17:28 +00:00 committed by Marc Kleine-Budde
parent 4c0b6eaf37
commit e9a2d81b17
1 changed files with 11 additions and 13 deletions
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24
drivers/net/can/usb/gs_usb.c
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@ -826,9 +826,8 @@ static struct gs_can *gs_make_candev(unsigned int channel, struct usb_interface
static void gs_destroy_candev(struct gs_can *dev)
{
unregister_candev(dev->netdev);
free_candev(dev->netdev);
usb_kill_anchored_urbs(&dev->tx_submitted);
kfree(dev);
free_candev(dev->netdev);
}
static int gs_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
@ -913,12 +912,15 @@ static int gs_usb_probe(struct usb_interface *intf, const struct usb_device_id *
for (i = 0; i < icount; i++) {
dev->canch[i] = gs_make_candev(i, intf);
if (IS_ERR_OR_NULL(dev->canch[i])) {
/* save error code to return later */
rc = PTR_ERR(dev->canch[i]);
/* on failure destroy previously created candevs */
icount = i;
for (i = 0; i < icount; i++) {
for (i = 0; i < icount; i++)
gs_destroy_candev(dev->canch[i]);
dev->canch[i] = NULL;
}
usb_kill_anchored_urbs(&dev->rx_submitted);
kfree(dev);
return rc;
}
@ -939,16 +941,12 @@ static void gs_usb_disconnect(struct usb_interface *intf)
return;
}
for (i = 0; i < GS_MAX_INTF; i++) {
struct gs_can *can = dev->canch[i];
if (!can)
continue;
gs_destroy_candev(can);
}
for (i = 0; i < GS_MAX_INTF; i++)
if (dev->canch[i])
gs_destroy_candev(dev->canch[i]);
usb_kill_anchored_urbs(&dev->rx_submitted);
kfree(dev);
}
static const struct usb_device_id gs_usb_table[] = {