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Miklos Szeredi d74309db6c af_unix: fix garbage collect vs MSG_PEEK 
commit cbcf01128d0a92e131bd09f1688fe032480b65ca upstream.

unix_gc() assumes that candidate sockets can never gain an external
reference (i.e.  be installed into an fd) while the unix_gc_lock is
held.  Except for MSG_PEEK this is guaranteed by modifying inflight
count under the unix_gc_lock.

MSG_PEEK does not touch any variable protected by unix_gc_lock (file
count is not), yet it needs to be serialized with garbage collection.
Do this by locking/unlocking unix_gc_lock:

 1) increment file count

 2) lock/unlock barrier to make sure incremented file count is visible
    to garbage collection

 3) install file into fd

This is a lock barrier (unlike smp_mb()) that ensures that garbage
collection is run completely before or completely after the barrier.

Cc: <stable@vger.kernel.org>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Change-Id: I456debe82b5ce974949763a4770c63c6c6093c18
Git-commit: 1dabafa9f6
Git-repo: https://android.googlesource.com/kernel/msm
Signed-off-by: PavanKumar S.R <quic_pavasr@quicinc.com>
2021-12-14 10:35:34 +05:30
..
6lowpan 6lowpan: Off by one handling ->nexthdr 2020-01-27 14:50:41 +01:00
9p net: 9p: initialize sun_server.sun_path to have addr's value only when addr is valid 2020-11-05 11:08:44 +01:00
802
8021q
appletalk
atm atm: fix a memory leak of vcc->user_back 2020-10-01 13:14:43 +02:00
ax25 AX.25: Prevent integer overflows in connect and sendmsg 2020-07-31 18:37:48 +02:00
batman-adv batman-adv: mcast: fix duplicate mcast packets from BLA backbone to mesh 2020-10-01 13:14:52 +02:00
bluetooth Merge android-4.19-stable.157 (8ee67bc) into msm-4.19 2020-12-18 18:35:06 +05:30
bpf
bpfilter signal/bpfilter: Fix bpfilter_kernl to use send_sig not force_sig 2020-01-27 14:50:51 +01:00
bridge net: bridge: enfore alignment for ethernet address 2020-06-30 23:17:03 -04:00
caif
can
ceph Merge android-4.19-stable.157 (8ee67bc) into msm-4.19 2020-12-18 18:35:06 +05:30
core net/sched: fix race between deactivation and dequeue for NOLOCK qdisc 2021-03-15 21:01:16 +05:30
dcb net: DCB: Validate DCB_ATTR_DCB_BUFFER argument 2020-09-26 18:01:29 +02:00
dccp net: ipv6: add net argument to ip6_dst_lookup_flow 2020-04-29 16:31:16 +02:00
decnet
dns_resolver KEYS: Don't write out to userspace while holding key semaphore 2020-04-23 10:30:24 +02:00
dsa net: dsa: read mac address from DT for slave device 2020-11-10 12:36:02 +01:00
ethernet
hsr hsr: check protocol version in hsr_newlink() 2020-04-21 09:03:03 +02:00
ieee802154 nl802154: add missing attribute validation for dev_type 2020-03-18 07:14:15 +01:00
ife
ipv4 Revert "ANDROID: net: ipv4: sysfs_net_ipv4: Add sysfs-based knobs for controlling TCP window size" 2021-08-30 02:23:36 -07:00
ipv6 Merge android-4.19-stable.157 (8ee67bc) into msm-4.19 2020-12-18 18:35:06 +05:30
iucv net/af_iucv: always register net_device notifier 2020-01-27 14:50:56 +01:00
kcm
key af_key: pfkey_dump needs parameter validation 2020-09-26 18:01:28 +02:00
l2tp l2tp: remove skb_dst_set() from l2tp_xmit_skb() 2020-07-22 09:31:59 +02:00
l3mdev
lapb
llc net: silence data-races on sk_backlog.tail 2020-10-01 13:14:26 +02:00
mac80211 Merge android-4.19-stable.157 (8ee67bc) into msm-4.19 2020-12-18 18:35:06 +05:30
mac802154 Merge android-4.19-stable.149 (9ce79d9) into msm-4.19 2020-10-21 09:25:49 +05:30
mpls net: ipv6_stub: use ip6_dst_lookup_flow instead of ip6_dst_lookup 2020-04-29 16:31:17 +02:00
ncsi
netfilter ANDROID: xt_qtaguid: fix UAF race 2021-08-30 13:04:56 +05:30
netlabel netlabel: fix problems with mapping removal 2020-09-12 13:40:22 +02:00
netlink Revert "genetlink: remove genl_bind" 2020-07-23 10:12:18 -07:00
netrom net: netrom: Fix potential nr_neigh refcnt leak in nr_add_node 2020-04-29 16:31:21 +02:00
nfc nfc: Ensure presence of NFC_ATTR_FIRMWARE_NAME attribute in nfc_genl_fw_download() 2020-10-29 09:54:58 +01:00
nsh
openvswitch openvswitch: handle DNAT tuple collision 2020-10-14 10:31:24 +02:00
packet Merge android-4.19-stable.152 (13abe23) into msm-4.19 2020-10-28 17:52:20 +05:30
phonet
psample
qrtr net: qrtr: Use radix_tree_iter_delete to delete tx flow 2021-11-17 17:41:02 +05:30
rds rds: Prevent kernel-infoleak in rds_notify_queue_get() 2020-08-05 10:06:01 +02:00
rfkill Merge android-4.19-q.95 (138a4a6) into msm-4.19 2020-02-03 21:43:57 -08:00
rose
rxrpc Merge android-4.19-stable.152 (13abe23) into msm-4.19 2020-10-28 17:52:20 +05:30
sched net: sch_generic: fix the missing new qdisc assignment 2021-01-05 22:34:12 +05:30
sctp sctp: Fix COMM_LOST/CANT_STR_ASSOC err reporting on big-endian platforms 2020-11-10 12:35:54 +01:00
smc net/smc: fix valid DMBE buffer sizes 2020-10-29 09:54:55 +01:00
strparser
sunrpc Merge android-4.19-stable.157 (8ee67bc) into msm-4.19 2020-12-18 18:35:06 +05:30
switchdev
tipc tipc: fix use-after-free in tipc_bcast_get_mode 2020-11-10 12:35:53 +01:00
tls net/tls: sendfile fails with ktls offload 2020-10-29 09:54:56 +01:00
unix af_unix: fix garbage collect vs MSG_PEEK 2021-12-14 10:35:34 +05:30
vmw_vsock vsock: use ns_capable_noaudit() on socket create 2020-11-10 12:35:59 +01:00
wimax
wireless cfg80211: Adjust 6 GHz frequency to channel conversion 2021-03-17 21:38:12 -07:00
x25 net/x25: Fix null-ptr-deref in x25_disconnect 2020-08-05 10:06:02 +02:00
xdp xdp: Fix xsk_generic_xmit errno 2020-06-25 15:33:05 +02:00
xfrm ANDROID: Temporarily disable XFRM_USER_COMPAT filtering 2020-11-05 18:12:45 +00:00
compat.c net/compat: Add missing sock updates for SCM_RIGHTS 2020-08-21 11:05:32 +02:00
Kconfig Merge android-4.19.110 (1984fff) into msm-4.19 2020-05-23 05:08:22 -07:00
Makefile net: split out functions related to registering inflight socket files 2021-12-14 10:20:10 +05:30
socket.c Merge android-4.19-stable.146 (443485d) into msm-4.19 2020-10-16 11:06:31 +05:30
sysctl_net.c