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Alexander Hölzl 44de577e61 can: j1939: j1939_sk_send_loop(): fix unable to send messages with data length zero 
The J1939 standard requires the transmission of messages of length 0.

For example proprietary messages are specified with a data length of 0
to 1785. The transmission of such messages is not possible. Sending
results in no error being returned but no corresponding can frame
being generated.

Enable the transmission of zero length J1939 messages. In order to
facilitate this two changes are necessary:

1) If the transmission of a new message is requested from user space
the message is segmented in j1939_sk_send_loop(). Let the segmentation
take into account zero length messages, do not terminate immediately,
queue the corresponding skb.

2) j1939_session_skb_get_by_offset() selects the next skb to transmit
for a session. Take into account that there might be zero length skbs
in the queue.

Signed-off-by: Alexander Hölzl <alexander.hoelzl@gmx.net>
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://patch.msgid.link/20250205174651.103238-1-alexander.hoelzl@gmx.net
Fixes: 9d71dd0c70 ("can: add support of SAE J1939 protocol")
Cc: stable@vger.kernel.org
[mkl: commit message rephrased]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2025-02-08 11:28:57 +01:00
..
6lowpan ipv6: eliminate ndisc_ops_is_useropt() 2024-08-12 17:23:57 -07:00
9p net/9p/usbg: allow building as standalone module 2024-11-22 23:48:14 +09:00
802 net: 802: LLC+SNAP OID:PID lookup on start of skb data 2025-01-04 08:06:24 -08:00
8021q net: convert to nla_get_*_default() 2024-11-11 10:32:06 -08:00
appletalk net: appletalk: Drop aarp_send_probe_phase1() 2025-01-20 10:08:19 +00:00
atm atm: clean up a put_user() calls 2024-06-14 19:08:50 -07:00
ax25 ax25: Fix refcount leak caused by setting SO_BINDTODEVICE sockopt 2025-02-06 17:02:40 -08:00
batman-adv This cleanup patchset includes the following patches: 2025-01-18 17:57:31 -08:00
bluetooth First batch of fixes for 6.14. Nothing really stands out, 2025-01-30 12:24:20 -08:00
bpf bpf-next-6.14 2025-01-23 08:04:07 -08:00
bridge netfilter: br_netfilter: remove unused conditional and dead code 2025-01-19 16:41:52 +01:00
caif caif: Remove unused cfsrvl_getphyid 2024-10-08 15:33:49 -07:00
can can: j1939: j1939_sk_send_loop(): fix unable to send messages with data length zero 2025-02-08 11:28:57 +01:00
ceph ceph: allocate sparse_ext map only for sparse reads 2024-12-16 23:25:44 +01:00
core rtnetlink: fix netns leak with rtnl_setlink() 2025-02-06 17:17:44 -08:00
dcb dcb: Use rtnl_register_many(). 2024-10-15 18:52:26 -07:00
dccp sysctl net: Remove macro checks for CONFIG_SYSCTL 2025-01-20 12:01:34 -08:00
devlink devlink: Improve the port attributes description 2025-01-02 17:10:57 -08:00
dns_resolver Networking changes for 6.8. 2024-01-11 10:07:29 -08:00
dsa Driver core and debugfs updates 2025-01-28 12:25:12 -08:00
ethernet netkit: Fix pkt_type override upon netkit pass verdict 2024-05-25 10:48:57 -07:00
ethtool net: ethtool: tsconfig: Fix netlink type of hwtstamp flags 2025-02-06 16:35:21 -08:00
handshake module: Convert symbol namespace to string literal 2024-12-02 11:34:44 -08:00
hsr First batch of fixes for 6.14. Nothing really stands out, 2025-01-30 12:24:20 -08:00
ieee802154 net: convert to nla_get_*_default() 2024-11-11 10:32:06 -08:00
ife net: sched: ife: fix potential use-after-free 2023-12-15 10:50:18 +00:00
ipv4 ipv4: icmp: convert to dev_net_rcu() 2025-02-06 16:14:15 -08:00
ipv6 ipv6: Use RCU in ip6_input() 2025-02-06 16:14:15 -08:00
iucv s390/iucv: MSG_PEEK causes memory leak in iucv_sock_destruct() 2024-11-26 10:02:53 +01:00
kcm kcm: replace call_rcu by kfree_rcu for simple kmem_cache_free callback 2024-10-15 10:50:21 -07:00
key xfrm: Add support for per cpu xfrm state handling. 2024-10-29 11:56:00 +01:00
l2tp l2tp: Use inet_sk_init_flowi4() in l2tp_ip_sendmsg(). 2024-12-20 13:50:09 -08:00
l3mdev
lapb
llc sysctl net: Remove macro checks for CONFIG_SYSCTL 2025-01-20 12:01:34 -08:00
mac80211 Driver core and debugfs updates 2025-01-28 12:25:12 -08:00
mac802154 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-01-09 16:11:47 -08:00
mctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2024-12-19 11:35:07 -08:00
mpls rtnetlink: Return int from rtnl_af_register(). 2024-10-22 11:02:05 +02:00
mptcp mptcp: blackhole only if 1st SYN retrans w/o MPC is accepted 2025-01-30 14:02:19 +01:00
ncsi net/ncsi: use dev_set_mac_address() for Get MC MAC Address handling 2025-01-27 09:20:07 +00:00
netfilter First batch of fixes for 6.14. Nothing really stands out, 2025-01-30 12:24:20 -08:00
netlabel net: corrections for security_secid_to_secctx returns 2025-01-04 22:11:22 -05:00
netlink net: netlink: catch attempts to send empty messages 2024-12-19 18:06:28 -08:00
netrom netrom: check buffer length before accessing it 2024-12-23 10:04:55 -08:00
nfc NFC: nci: Add bounds checking in nci_hci_create_pipe() 2025-01-22 19:39:27 -08:00
nsh nsh: Restore skb->{protocol,data,mac_header} for outer header in nsh_gso_segment(). 2024-04-26 12:20:01 +02:00
openvswitch openvswitch: fix lockup on tx to unregistering netdev with carrier 2025-01-10 18:20:49 -08:00
packet Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-01-03 16:29:29 -08:00
phonet phonet: do not call synchronize_rcu() from phonet_route_del() 2024-11-07 20:34:16 -08:00
psample psample: adjust size if rate_as_probability is set 2024-12-18 19:23:04 -08:00
qrtr net: qrtr: Update packets cloning when broadcasting 2024-09-24 10:48:16 +02:00
rds rds: sysctl: rds_tcp_{rcv,snd}buf: avoid using current->nsproxy 2025-01-09 08:53:35 -08:00
rfkill Get rid of 'remove_new' relic from platform driver struct 2024-12-01 15:12:43 -08:00
rose net: rose: lock the socket in rose_bind() 2025-02-04 14:03:58 -08:00
rxrpc rxrpc: Fix race in call state changing vs recvmsg() 2025-02-05 18:47:46 -08:00
sched netem: Update sch->q.qlen before qdisc_tree_reduce_backlog() 2025-02-05 18:14:46 -08:00
sctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-01-09 16:11:47 -08:00
shaper net: add netdev_lock() / netdev_unlock() helpers 2025-01-15 19:13:33 -08:00
smc net/smc: fix data error when recvmsg with MSG_PEEK flag 2025-01-13 18:59:00 -08:00
strparser
sunrpc assorted stuff for this merge window 2025-02-01 15:07:56 -08:00
switchdev net: bridge: switchdev: Improve error message for port_obj_add/del functions 2024-05-08 12:19:12 +01:00
tipc tipc: re-order conditions in tipc_crypto_key_rcv() 2025-01-20 12:18:26 +00:00
tls tls: skip setting sk_write_space on rekey 2025-01-10 18:34:45 -08:00
unix af_unix: Use consume_skb() in connect() and sendmsg(). 2025-01-20 11:27:42 -08:00
vmw_vsock First batch of fixes for 6.14. Nothing really stands out, 2025-01-30 12:24:20 -08:00
wireless Driver core and debugfs updates 2025-01-28 12:25:12 -08:00
x25 net: change proto and proto_ops accept type 2024-05-13 18:19:09 -06:00
xdp xsk: Bring back busy polling support 2025-01-10 18:07:56 -08:00
xfrm ipsec-2025-01-27 2025-01-27 15:15:12 -08:00
compat.c file: stop exposing receive_fd_user() 2023-12-12 14:24:14 +01:00
devres.c
Kconfig netlink: spec: add shaper YAML spec 2024-10-10 08:30:21 -07:00
Kconfig.debug rtnetlink: Add per-netns RTNL. 2024-10-08 15:16:59 +02:00
Makefile netlink: spec: add shaper YAML spec 2024-10-10 08:30:21 -07:00
socket.c socket: Remove unused kernel_sendmsg_locked 2025-01-14 17:29:04 -08:00
sysctl_net.c sysctl: Remove check for sentinel element in ctl_table arrays 2024-06-13 10:50:52 +02:00