| From | lizf@kernel ... | Subject | [PATCH 3.4 086/172] can: add missing initialisations in CAN related skbuffs | Date | Tue, 16 Jun 2015 16:35:40 +0800 |
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From: Oliver Hartkopp <socketcan@hartkopp.net>
3.4.108-rc1 review patch. If anyone has any objections, please let me know.
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commit 969439016d2cf61fef53a973d7e6d2061c3793b1 upstream.
When accessing CAN network interfaces with AF_PACKET sockets e.g. by dhclient this can lead to a skb_under_panic due to missing skb initialisations.
Add the missing initialisations at the CAN skbuff creation times on driver level (rx path) and in the network layer (tx path).
Reported-by: Austin Schuh <austin@peloton-tech.com> Reported-by: Daniel Steer <daniel.steer@mclaren.com> Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> [lizf: Backported to 3.4: - adjust context - drop changes to alloc_canfd_skb(), as there's no such function] Signed-off-by: Zefan Li <lizefan@huawei.com> --- drivers/net/can/dev.c | 5 +++++ net/can/af_can.c | 3 +++ 2 files changed, 8 insertions(+)
diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c index 88c39e4..81a00e4 100644 --- a/drivers/net/can/dev.c +++ b/drivers/net/can/dev.c @@ -475,6 +475,11 @@ struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf) skb->protocol = htons(ETH_P_CAN); skb->pkt_type = PACKET_BROADCAST; skb->ip_summed = CHECKSUM_UNNECESSARY; + + skb_reset_mac_header(skb); + skb_reset_network_header(skb); + skb_reset_transport_header(skb); + *cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame)); memset(*cf, 0, sizeof(struct can_frame)); diff --git a/net/can/af_can.c b/net/can/af_can.c index 0ce2ad0..7d9dff222 100644 --- a/net/can/af_can.c +++ b/net/can/af_can.c @@ -244,6 +244,9 @@ int can_send(struct sk_buff *skb, int loop) } skb->protocol = htons(ETH_P_CAN); + skb->ip_summed = CHECKSUM_UNNECESSARY; + + skb_reset_mac_header(skb); skb_reset_network_header(skb); skb_reset_transport_header(skb); -- 1.9.1
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