From: Oliver Hartkopp Date: Mon, 23 Feb 2015 19:37:54 +0000 (+0100) Subject: can: add missing initialisations in CAN related skbuffs X-Git-Tag: v3.4.108~88 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2932a0a1abaaab014a5698c26dc95956618b4286;p=thirdparty%2Fkernel%2Fstable.git can: add missing initialisations in CAN related skbuffs 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 Reported-by: Daniel Steer Signed-off-by: Oliver Hartkopp Signed-off-by: Marc Kleine-Budde [lizf: Backported to 3.4: - adjust context - drop changes to alloc_canfd_skb(), as there's no such function] Signed-off-by: Zefan Li --- diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c index 88c39e42cf5a0..81a00e4d6de68 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 0ce2ad0696da8..7d9dff2227d15 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);