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| author | Marc Kleine-Budde <mkl@pengutronix.de> | 2015-07-11 21:16:08 +0200 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2015-07-15 09:04:27 +0200 |
| commit | 83537b6fd6c3752bcb578d2bd46312d1e2c4a73a (patch) | |
| tree | 8c2dd4ded1e212e2190bdbb8adddb348cc54ae4f /drivers/net/can | |
| parent | 20926d79244de4e9c698ae429fdc1e7e5832b081 (diff) | |
| download | linux-83537b6fd6c3752bcb578d2bd46312d1e2c4a73a.tar.gz linux-83537b6fd6c3752bcb578d2bd46312d1e2c4a73a.tar.bz2 linux-83537b6fd6c3752bcb578d2bd46312d1e2c4a73a.zip | |
can: grcan: 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: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'drivers/net/can')
| -rw-r--r-- | drivers/net/can/grcan.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/net/can/grcan.c b/drivers/net/can/grcan.c index e3d7e22a4fa0..db9538d4b358 100644 --- a/drivers/net/can/grcan.c +++ b/drivers/net/can/grcan.c @@ -1216,11 +1216,12 @@ static int grcan_receive(struct net_device *dev, int budget) cf->data[i] = (u8)(slot[j] >> shift); } } - netif_receive_skb(skb); /* Update statistics and read pointer */ stats->rx_packets++; stats->rx_bytes += cf->can_dlc; + netif_receive_skb(skb); + rd = grcan_ring_add(rd, GRCAN_MSG_SIZE, dma->rx.size); } |