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Tetsuo Handa d31a56d23e net/nfc: Avoid stalls when nfc_alloc_send_skb() returned NULL. 
commit 3bc53be9db upstream.

syzbot is reporting stalls at nfc_llcp_send_ui_frame() [1]. This is
because nfc_llcp_send_ui_frame() is retrying the loop without any delay
when nonblocking nfc_alloc_send_skb() returned NULL.

Since there is no need to use MSG_DONTWAIT if we retry until
sock_alloc_send_pskb() succeeds, let's use blocking call.
Also, in case an unexpected error occurred, let's break the loop
if blocking nfc_alloc_send_skb() failed.

[1] https://syzkaller.appspot.com/bug?id=4a131cc571c3733e0eff6bc673f4e36ae48f19c6

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reported-by: syzbot <syzbot+d29d18215e477cfbfbdd@syzkaller.appspotmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-07-22 14:27:40 +02:00
..
6lowpan
…
9p
9p/trans_virtio: discard zero-length reply
2018-02-22 15:43:50 +01:00
802
…
8021q
vlan: also check phy_driver ts_info for vlan's real device
2018-04-13 19:48:34 +02:00
appletalk
…
atm
net: atm: Fix potential Spectre v1
2018-05-16 10:08:44 +02:00
ax25
…
batman-adv
batman-adv: fix packet loss for broadcasted DHCP packets to a server
2018-05-30 07:50:38 +02:00
bluetooth
Bluetooth: Fix connection if directed advertising and privacy is used
2018-04-20 08:21:07 +02:00
bridge
netfilter: ebtables: reject non-bridge targets
2018-07-22 14:27:39 +02:00
caif
…
can
can: af_can: canfd_rcv(): replace WARN_ONCE by pr_warn_once
2018-01-31 12:55:50 +01:00
ceph
libceph: validate con->state at the top of try_write()
2018-05-01 15:13:09 -07:00
core
rtnetlink: validate attributes in do_setlink()
2018-06-13 16:16:43 +02:00
dcb
…
dccp
net: dccp: switch rx_tstamp_last_feedback to monotonic clock
2018-07-22 14:27:36 +02:00
decnet
dn_getsockoptdecnet: move nf_{get/set}sockopt outside sock lock
2018-02-25 11:05:44 +01:00
dns_resolver
KEYS: DNS: fix parsing multiple options
2018-07-22 14:27:39 +02:00
dsa
…
ethernet
…
hsr
hsr: fix incorrect warning
2018-04-13 19:48:29 +02:00
ieee802154
net: ieee802154: fix net_device reference release too early
2018-04-13 19:48:04 +02:00
ipv4
tcp: prevent bogus FRTO undos with non-SACK flows
2018-07-22 14:27:37 +02:00
ipv6
netfilter: ipv6: nf_defrag: drop skb dst before queueing
2018-07-22 14:27:39 +02:00
ipx
…
irda
…
iucv
net/iucv: Free memory obtained by kzalloc
2018-03-31 18:11:34 +02:00
kcm
kcm: Fix use-after-free caused by clonned sockets
2018-06-13 16:16:42 +02:00
key
af_key: Always verify length of provided sadb_key
2018-06-16 09:52:32 +02:00
l2tp
l2tp: revert "l2tp: fix missing print session offset info"
2018-05-19 10:27:00 +02:00
l3mdev
…
lapb
…
llc
llc: properly handle dev_queue_xmit() return value
2018-05-30 07:50:39 +02:00
mac80211
mac80211: drop frames with unexpected DS bits from fast-rx to slow path
2018-05-30 07:50:30 +02:00
mac802154
…
mpls
mpls, nospec: Sanitize array index in mpls_label_ok()
2018-03-11 16:21:34 +01:00
ncsi
…
netfilter
netfilter: nf_queue: augment nfqa_cfg_policy
2018-07-17 11:37:54 +02:00
netlabel
netlabel: If PF_INET6, check sk_buff ip header version
2018-05-30 07:50:51 +02:00
netlink
netlink: fix uninit-value in netlink_sendmsg
2018-05-16 10:08:40 +02:00
netrom
…
nfc
net/nfc: Avoid stalls when nfc_alloc_send_skb() returned NULL.
2018-07-22 14:27:40 +02:00
openvswitch
openvswitch: Remove padding from packet before L3+ conntrack processing
2018-05-30 07:50:23 +02:00
packet
net/packet: fix use-after-free
2018-07-22 14:27:38 +02:00
phonet
…
qrtr
qrtr: add MODULE_ALIAS macro to smd
2018-05-30 07:50:32 +02:00
rds
rds: avoid unenecessary cong_update in loop transport
2018-07-22 14:27:39 +02:00
rfkill
rfkill: gpio: fix memory leak in probe error path
2018-05-16 10:08:43 +02:00
rose
…
rxrpc
rxrpc: Don't treat call aborts as conn aborts
2018-05-30 07:50:42 +02:00
sched
net_sched: blackhole: tell upper qdisc about dropped packets
2018-07-22 14:27:36 +02:00
sctp
sctp: not allow transport timeout value less than HZ/5 for hb_timer
2018-06-13 16:16:43 +02:00
strparser
strparser: Fix incorrect strp->need_bytes value.
2018-04-29 11:32:02 +02:00
sunrpc
rpc_pipefs: fix double-dput()
2018-04-24 09:34:17 +02:00
switchdev
…
tipc
tipc: add policy for TIPC_NLA_NET_ADDR
2018-04-29 11:32:01 +02:00
unix
…
vmw_vsock
vsock: cancel packets when failing to connect
2017-12-25 14:23:38 +01:00
wimax
…
wireless
cfg80211: limit wiphy names to 128 bytes
2018-05-25 16:12:59 +02:00
x25
net: x25: fix one potential use-after-free issue
2018-04-13 19:48:00 +02:00
xfrm
xfrm: fix xfrm_do_migrate() with AEAD e.g(AES-GCM)
2018-05-19 10:27:00 +02:00
compat.c
net: support compat 64-bit time in {s,g}etsockopt
2018-05-19 10:26:58 +02:00
Kconfig
…
Makefile
…
socket.c
bpf: introduce BPF_JIT_ALWAYS_ON config
2018-01-31 12:55:56 +01:00
sysctl_net.c
…