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can: kvaser_usb: Avoid double free on URB submission failures 

Upon a URB submission failure, the driver calls usb_free_urb()
but then manually frees the URB buffer by itself.  Meanwhile
usb_free_urb() has alredy freed out that transfer buffer since
we're the only code path holding a reference to this URB.

Remove two of such invalid manual free().

Signed-off-by: Ahmed S. Darwish <ahmed.darwish@valeo.com>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Ahmed S. Darwish 2015-02-26 10:20:11 -05:00 committed by Marc Kleine-Budde
parent b0d4724b8e
commit deb2701cf7
1 changed files with 8 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/net/can/usb/kvaser_usb.c
View File

@ -787,7 +787,6 @@ static int kvaser_usb_simple_msg_async(struct kvaser_usb_net_priv *priv,
netdev_err(netdev, "Error transmitting URB\n");
usb_unanchor_urb(urb);
usb_free_urb(urb);
kfree(buf);
return err;
}
@ -1615,8 +1614,7 @@ static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
struct urb *urb;
void *buf;
struct kvaser_msg *msg;
int i, err;
int ret = NETDEV_TX_OK;
int i, err, ret = NETDEV_TX_OK;
u8 *msg_tx_can_flags = NULL; /* GCC */
if (can_dropped_invalid_skb(netdev, skb))
@ -1634,7 +1632,7 @@ static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
if (!buf) {
stats->tx_dropped++;
dev_kfree_skb(skb);
goto nobufmem;
goto freeurb;
}
msg = buf;
@ -1681,8 +1679,10 @@ static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
/* This should never happen; it implies a flow control bug */
if (!context) {
netdev_warn(netdev, "cannot find free context\n");
kfree(buf);
ret = NETDEV_TX_BUSY;
goto releasebuf;
goto freeurb;
}
context->priv = priv;
@ -1719,16 +1719,12 @@ static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
else
netdev_warn(netdev, "Failed tx_urb %d\n", err);
goto releasebuf;
goto freeurb;
}
usb_free_urb(urb);
ret = NETDEV_TX_OK;
return NETDEV_TX_OK;
releasebuf:
kfree(buf);
nobufmem:
freeurb:
usb_free_urb(urb);
return ret;
}