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can: ems_usb: don't touch skb after netif_rx() 

There is no guarantee that the skb is in the same state after calling
net_receive_skb() or netif_rx(). It might be freed or reused. Not really
harmful as its a read access, except you turn on the proper debugging options
which catch a use after free.

Cc: Gerhard Uttenthaler <uttenthaler@ems-wuensche.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde 2015-07-11 21:16:08 +02:00
parent 296decb693
commit 43c021e8d6
1 changed files with 2 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/net/can/usb/ems_usb.c
View File

@ -324,10 +324,9 @@ static void ems_usb_rx_can_msg(struct ems_usb *dev, struct ems_cpc_msg *msg)
cf->data[i] = msg->msg.can_msg.msg[i];
}
netif_rx(skb);
stats->rx_packets++;
stats->rx_bytes += cf->can_dlc;
netif_rx(skb);
}
static void ems_usb_rx_err(struct ems_usb *dev, struct ems_cpc_msg *msg)
@ -400,10 +399,9 @@ static void ems_usb_rx_err(struct ems_usb *dev, struct ems_cpc_msg *msg)
stats->rx_errors++;
}
netif_rx(skb);
stats->rx_packets++;
stats->rx_bytes += cf->can_dlc;
netif_rx(skb);
}
/*