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can: flexcan: don't touch skb after netif_receive_skb()

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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.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde 2015-05-08 11:30:29 +02:00
parent 6ae3673deb
commit a18ec1b6c7
1 changed files with 3 additions and 4 deletions
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7
drivers/net/can/flexcan.c
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@ -577,10 +577,10 @@ static int flexcan_poll_bus_err(struct net_device *dev, u32 reg_esr)
return 0; return 0;
do_bus_err(dev, cf, reg_esr); do_bus_err(dev, cf, reg_esr);
netif_receive_skb(skb);
dev->stats.rx_packets++; dev->stats.rx_packets++;
dev->stats.rx_bytes += cf->can_dlc; dev->stats.rx_bytes += cf->can_dlc;
netif_receive_skb(skb);
return 1; return 1;
} }
@ -622,10 +622,9 @@ static int flexcan_poll_state(struct net_device *dev, u32 reg_esr)
if (unlikely(new_state == CAN_STATE_BUS_OFF)) if (unlikely(new_state == CAN_STATE_BUS_OFF))
can_bus_off(dev); can_bus_off(dev);
netif_receive_skb(skb);
dev->stats.rx_packets++; dev->stats.rx_packets++;
dev->stats.rx_bytes += cf->can_dlc; dev->stats.rx_bytes += cf->can_dlc;
netif_receive_skb(skb);
return 1; return 1;
} }
@ -670,10 +669,10 @@ static int flexcan_read_frame(struct net_device *dev)
} }
flexcan_read_fifo(dev, cf); flexcan_read_fifo(dev, cf);
netif_receive_skb(skb);
stats->rx_packets++; stats->rx_packets++;
stats->rx_bytes += cf->can_dlc; stats->rx_bytes += cf->can_dlc;
netif_receive_skb(skb);
can_led_event(dev, CAN_LED_EVENT_RX); can_led_event(dev, CAN_LED_EVENT_RX);