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linux/net/sctp
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Eric Dumazet 0f56180a8f sctp: sctp_sockaddr_af must check minimal addr length for AF_INET6 
[ Upstream commit 81e9837029 ]

Check must happen before call to ipv6_addr_v4mapped()

syzbot report was :

BUG: KMSAN: uninit-value in sctp_sockaddr_af net/sctp/socket.c:359 [inline]
BUG: KMSAN: uninit-value in sctp_do_bind+0x60f/0xdc0 net/sctp/socket.c:384
CPU: 0 PID: 3576 Comm: syzkaller968804 Not tainted 4.16.0+ #82
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676
 sctp_sockaddr_af net/sctp/socket.c:359 [inline]
 sctp_do_bind+0x60f/0xdc0 net/sctp/socket.c:384
 sctp_bind+0x149/0x190 net/sctp/socket.c:332
 inet6_bind+0x1fd/0x1820 net/ipv6/af_inet6.c:293
 SYSC_bind+0x3f2/0x4b0 net/socket.c:1474
 SyS_bind+0x54/0x80 net/socket.c:1460
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x43fd49
RSP: 002b:00007ffe99df3d28 EFLAGS: 00000213 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd49
RDX: 0000000000000010 RSI: 0000000020000000 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000004002c8 R11: 0000000000000213 R12: 0000000000401670
R13: 0000000000401700 R14: 0000000000000000 R15: 0000000000000000

Local variable description: ----address@SYSC_bind
Variable was created at:
 SYSC_bind+0x6f/0x4b0 net/socket.c:1461
 SyS_bind+0x54/0x80 net/socket.c:1460

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Vlad Yasevich <vyasevich@gmail.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2018-04-12 12:30:00 +02:00
..
associola.c sctp: implement enqueue_event for sctp_stream_interleave 2017-12-11 11:23:05 -05:00
auth.c sctp: remove the typedef sctp_hmac_algo_param_t 2017-07-16 20:52:14 -07:00
bind_addr.c sctp: remove the typedef sctp_scope_t 2017-08-06 21:33:41 -07:00
chunk.c sctp: implement enqueue_event for sctp_stream_interleave 2017-12-11 11:23:05 -05:00
debug.c sctp: add SCTP_CID_I_DATA and SCTP_CID_I_FWD_TSN conversion in sctp_cname 2018-02-12 11:40:01 -05:00
endpointola.c net: tracepoint: using sock_set_state tracepoint to trace SCTP state transition 2017-12-20 14:00:25 -05:00
input.c net: use skb_is_gso_sctp() instead of open-coding 2018-03-09 11:41:47 -05:00
inqueue.c net: use skb_is_gso_sctp() instead of open-coding 2018-03-09 11:41:47 -05:00
ipv6.c sctp: do not leak kernel memory to user space 2018-04-12 12:30:00 +02:00
Kconfig net: sctp: Remove debug SCTP probe module 2018-01-02 14:27:29 -05:00
Makefile net: sctp: Remove debug SCTP probe module 2018-01-02 14:27:29 -05:00
objcnt.c sctp: remove the typedef sctp_dbg_objcnt_entry_t 2017-08-11 10:02:43 -07:00
offload.c net: use skb_is_gso_sctp() instead of open-coding 2018-03-09 11:41:47 -05:00
output.c sctp: implement assign_number for sctp_stream_interleave 2017-12-11 11:23:04 -05:00
outqueue.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-01-17 00:10:42 -05:00
primitive.c sctp: remove the typedef sctp_subtype_t 2017-08-06 21:33:42 -07:00
proc.c net: delete /proc THIS_MODULE references 2018-01-16 15:01:33 -05:00
protocol.c sctp: fix dst refcnt leak in sctp_v4_get_dst 2018-02-05 21:21:51 -05:00
sctp_diag.c sctp: Fix a big endian bug in sctp_diag_dump() 2017-09-26 21:16:29 -07:00
sm_make_chunk.c sctp: verify size of a new chunk in _sctp_make_chunk() 2018-02-09 14:31:38 -05:00
sm_sideeffect.c net: tracepoint: using sock_set_state tracepoint to trace SCTP state transition 2017-12-20 14:00:25 -05:00
sm_statefuns.c net: sctp: Add SCTP ACK tracking trace event 2018-01-02 14:27:29 -05:00
sm_statetable.c sctp: implement validate_ftsn for sctp_stream_interleave 2017-12-15 13:52:22 -05:00
socket.c sctp: sctp_sockaddr_af must check minimal addr length for AF_INET6 2018-04-12 12:30:00 +02:00
stream.c sctp: fix some copy-paste errors for file comments 2018-02-14 14:18:32 -05:00
stream_interleave.c sctp: remove the left unnecessary check for chunk in sctp_renege_events 2018-02-16 16:32:37 -05:00
stream_sched.c sctp: add stream interleave support in stream scheduler 2017-12-15 13:52:22 -05:00
stream_sched_prio.c sctp: remove extern from stream sched 2017-11-28 11:00:13 -05:00
stream_sched_rr.c sctp: remove extern from stream sched 2017-11-28 11:00:13 -05:00
sysctl.c sctp: support sysctl to allow users to use stream interleave 2017-12-15 13:52:22 -05:00
transport.c sctp: fix the handling of ICMP Frag Needed for too small MTUs 2018-01-08 14:19:13 -05:00
tsnmap.c sctp: Fix FSF address in file headers 2013-12-06 12:37:56 -05:00
ulpevent.c sctp: implement abort_pd for sctp_stream_interleave 2017-12-11 11:23:05 -05:00
ulpqueue.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-12-22 11:16:31 -05:00