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can: esd_usb2: 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: Thomas Körper <thomas.koerper@esd.eu>
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 889dd06e10
commit 296decb693
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/esd_usb2.c
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@ -301,13 +301,12 @@ static void esd_usb2_rx_event(struct esd_usb2_net_priv *priv,
cf->data[7] = rxerr; cf->data[7] = rxerr;
} }
netif_rx(skb);
priv->bec.txerr = txerr; priv->bec.txerr = txerr;
priv->bec.rxerr = rxerr; priv->bec.rxerr = rxerr;
stats->rx_packets++; stats->rx_packets++;
stats->rx_bytes += cf->can_dlc; stats->rx_bytes += cf->can_dlc;
netif_rx(skb);
} }
} }
@ -347,10 +346,9 @@ static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv,
cf->data[i] = msg->msg.rx.data[i]; cf->data[i] = msg->msg.rx.data[i];
} }
netif_rx(skb);
stats->rx_packets++; stats->rx_packets++;
stats->rx_bytes += cf->can_dlc; stats->rx_bytes += cf->can_dlc;
netif_rx(skb);
} }
return; return;