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d0caa7218d
linux/net/core
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Felix Maurer d0caa7218d bpf: Do not try bpf_msg_push_data with len 0 
commit 4a11678f68 upstream.

If bpf_msg_push_data() is called with len 0 (as it happens during
selftests/bpf/test_sockmap), we do not need to do anything and can
return early.

Calling bpf_msg_push_data() with len 0 previously lead to a wrong ENOMEM
error: we later called get_order(copy + len); if len was 0, copy + len
was also often 0 and get_order() returned some undefined value (at the
moment 52). alloc_pages() caught that and failed, but then bpf_msg_push_data()
returned ENOMEM. This was wrong because we are most probably not out of
memory and actually do not need any additional memory.

Fixes: 6fff607e2f ("bpf: sk_msg program helper bpf_msg_push_data")
Signed-off-by: Felix Maurer <fmaurer@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yhs@fb.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/df69012695c7094ccb1943ca02b4920db3537466.1644421921.git.fmaurer@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-03-02 11:42:48 +01:00
..
bpf_sk_storage.c bpf: Change bpf_sk_storage_*() to accept ARG_PTR_TO_BTF_ID_SOCK_COMMON 2020-09-25 13:58:01 -07:00
datagram.c udp: fix skb_copy_and_csum_datagram with odd segment sizes 2021-02-17 11:02:28 +01:00
datagram.h
dev_addr_lists.c net: core: add nested_level variable in net_device 2020-09-28 15:00:15 -07:00
dev_ioctl.c net: fix dev_ifsioc_locked() race condition 2021-03-07 12:34:07 +01:00
dev.c xdp: check prog type before updating BPF link 2022-01-27 10:54:30 +01:00
devlink.c devlink: Remove misleading internal_flags from health reporter dump 2022-01-27 10:54:34 +01:00
drop_monitor.c drop_monitor: fix data-race in dropmon_net_event / trace_napi_poll_hit 2022-02-23 12:01:02 +01:00
dst_cache.c wireguard: device: reset peer src endpoint when netns exits 2021-12-08 09:03:22 +01:00
dst.c net, bpf: Fix ip6ip6 crash with collect_md populated skbs 2021-03-30 14:32:05 +02:00
failover.c
fib_notifier.c
fib_rules.c ipv6: fix memory leak in fib6_rule_suppress 2021-12-08 09:03:21 +01:00
filter.c bpf: Do not try bpf_msg_push_data with len 0 2022-03-02 11:42:48 +01:00
flow_dissector.c flow_dissector: Fix out-of-bounds warnings 2021-09-18 13:40:22 +02:00
flow_offload.c net: Fix offloading indirect devices dependency on qdisc order creation 2021-09-18 13:40:30 +02:00
gen_estimator.c net_sched: gen_estimator: support large ewma log 2021-01-27 11:55:23 +01:00
gen_stats.c docs: networking: convert gen_stats.txt to ReST 2020-04-28 14:39:46 -07:00
gro_cells.c gro_cells: reduce number of synchronize_net() calls 2020-11-25 11:28:12 -08:00
hwbm.c
link_watch.c net: linkwatch: fix failure to restore device state across suspend/resume 2021-08-18 08:59:13 +02:00
lwt_bpf.c lwt_bpf: Replace preempt_disable() with migrate_disable() 2020-12-07 11:53:40 -08:00
lwtunnel.c lwtunnel: Validate RTA_ENCAP_TYPE attribute length 2022-01-11 15:25:00 +01:00
Makefile ethtool: move to its own directory 2019-12-12 17:07:05 -08:00
neighbour.c net, neigh: clear whole pneigh_entry at alloc time 2021-12-14 11:32:43 +01:00
net_namespace.c netns: add schedule point in ops_exit_list() 2022-01-27 10:54:33 +01:00
net-procfs.c net-procfs: show net devices bound packet types 2022-02-01 17:25:44 +01:00
net-sysfs.c net-sysfs: update the queue counts in the unregistration path 2022-01-27 10:54:15 +01:00
net-sysfs.h net-sysfs: add netdev_change_owner() 2020-02-26 20:07:25 -08:00
net-traces.c
netclassid_cgroup.c cgroup, netclassid: remove double cond_resched 2020-04-21 15:44:30 -07:00
netevent.c
netpoll.c net: Have netpoll bring-up DSA management interface 2020-11-18 11:04:11 -08:00
netprio_cgroup.c netprio_cgroup: Fix unlimited memory leak of v2 cgroups 2020-05-09 20:59:21 -07:00
page_pool.c mm: fix struct page layout on 32-bit systems 2021-05-19 10:13:17 +02:00
pktgen.c pktgen: fix misuse of BUG_ON() in pktgen_thread_worker() 2021-03-07 12:34:09 +01:00
ptp_classifier.c ptp: Add generic ptp v2 header parsing function 2020-08-19 16:07:49 -07:00
request_sock.c
rtnetlink.c net_sched: add __rcu annotation to netdev->qdisc 2022-02-23 12:01:02 +01:00
scm.c fs: Add receive_fd() wrapper for __receive_fd() 2020-07-13 11:03:44 -07:00
secure_seq.c crypto: lib/sha1 - remove unnecessary includes of linux/cryptohash.h 2020-05-08 15:32:17 +10:00
skbuff.c net: Fix double 0x prefix print in SKB dump 2021-12-22 09:30:55 +01:00
skmsg.c skmsg: Make sk_psock_destroy() static 2021-08-04 12:46:44 +02:00
sock_diag.c bpf, net: Rework cookie generator as per-cpu one 2020-09-30 11:50:35 -07:00
sock_map.c bpf: Fix integer overflow in argument calculation for bpf_map_area_alloc 2021-12-17 10:14:41 +01:00
sock_reuseport.c udp: Prevent reuseport_select_sock from reading uninitialized socks 2021-01-23 16:03:59 +01:00
sock.c sock: fix /proc/net/sockstat underflow in sk_clone_lock() 2021-11-26 10:39:14 +01:00
stream.c net: stream: don't purge sk_error_queue in sk_stream_kill_queues() 2021-11-18 14:04:08 +01:00
sysctl_net_core.c bpf: Prevent increasing bpf_jit_limit above max 2021-11-18 14:03:42 +01:00
timestamping.c net: Introduce a new MII time stamping interface. 2019-12-25 19:51:33 -08:00
tso.c net: tso: add UDP segmentation support 2020-06-18 20:46:23 -07:00
utils.c net: Fix skb->csum update in inet_proto_csum_replace16(). 2020-01-24 20:54:30 +01:00
xdp.c xdp: fix xdp_return_frame() kernel BUG throw for page_pool memory model 2021-04-14 08:42:09 +02:00