Ying Xue 8b66fee7f8 tipc: fix uninit-value in tipc_nl_compat_link_reset_stats ... syzbot reports following splat: BUG: KMSAN: uninit-value in strlen+0x3b/0xa0 lib/string.c:486 CPU: 1 PID: 11057 Comm: syz-executor0 Not tainted 4.20.0-rc7+ #2 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x173/0x1d0 lib/dump_stack.c:113 kmsan_report+0x12e/0x2a0 mm/kmsan/kmsan.c:613 __msan_warning+0x82/0xf0 mm/kmsan/kmsan_instr.c:295 strlen+0x3b/0xa0 lib/string.c:486 nla_put_string include/net/netlink.h:1154 [inline] tipc_nl_compat_link_reset_stats+0x1f0/0x360 net/tipc/netlink_compat.c:760 __tipc_nl_compat_doit net/tipc/netlink_compat.c:311 [inline] tipc_nl_compat_doit+0x3aa/0xaf0 net/tipc/netlink_compat.c:344 tipc_nl_compat_handle net/tipc/netlink_compat.c:1107 [inline] tipc_nl_compat_recv+0x14d7/0x2760 net/tipc/netlink_compat.c:1210 genl_family_rcv_msg net/netlink/genetlink.c:601 [inline] genl_rcv_msg+0x185f/0x1a60 net/netlink/genetlink.c:626 netlink_rcv_skb+0x444/0x640 net/netlink/af_netlink.c:2477 genl_rcv+0x63/0x80 net/netlink/genetlink.c:637 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0xf40/0x1020 net/netlink/af_netlink.c:1336 netlink_sendmsg+0x127f/0x1300 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg net/socket.c:631 [inline] ___sys_sendmsg+0xdb9/0x11b0 net/socket.c:2116 __sys_sendmsg net/socket.c:2154 [inline] __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg+0x305/0x460 net/socket.c:2161 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2161 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x457ec9 Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f2557338c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f25573396d4 R13: 00000000004cb478 R14: 00000000004d86c8 R15: 00000000ffffffff Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:204 [inline] kmsan_internal_poison_shadow+0x92/0x150 mm/kmsan/kmsan.c:158 kmsan_kmalloc+0xa6/0x130 mm/kmsan/kmsan_hooks.c:176 kmsan_slab_alloc+0xe/0x10 mm/kmsan/kmsan_hooks.c:185 slab_post_alloc_hook mm/slab.h:446 [inline] slab_alloc_node mm/slub.c:2759 [inline] __kmalloc_node_track_caller+0xe18/0x1030 mm/slub.c:4383 __kmalloc_reserve net/core/skbuff.c:137 [inline] __alloc_skb+0x309/0xa20 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:998 [inline] netlink_alloc_large_skb net/netlink/af_netlink.c:1182 [inline] netlink_sendmsg+0xb82/0x1300 net/netlink/af_netlink.c:1892 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg net/socket.c:631 [inline] ___sys_sendmsg+0xdb9/0x11b0 net/socket.c:2116 __sys_sendmsg net/socket.c:2154 [inline] __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg+0x305/0x460 net/socket.c:2161 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2161 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 The uninitialised access happened in tipc_nl_compat_link_reset_stats: nla_put_string(skb, TIPC_NLA_LINK_NAME, name) This is because name string is not validated before it's used. Reported-by: syzbot+e01d94b5a4c266be6e4c@syzkaller.appspotmail.com Signed-off-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2019-01-15 20:29:20 -08:00
..
addr.c	tipc: handle collisions of 32-bit node address hash values	2018-03-23 13:12:18 -04:00
addr.h	tipc: add 128-bit node identifier	2018-03-23 13:12:18 -04:00
bcast.c	tipc: correct spelling errors for struct tipc_bc_base's comment	2018-09-03 22:03:07 -07:00
bcast.h	tipc: make replicast a user selectable option	2017-01-20 12:10:17 -05:00
bearer.c	tipc: fix a double free in tipc_enable_bearer()	2018-12-27 16:16:17 -08:00
bearer.h	tipc: enable tracepoints in tipc	2018-12-19 11:49:24 -08:00
core.c	net: Drop pernet_operations::async	2018-03-27 13:18:09 -04:00
core.h	tipc: replace name table service range array with rb tree	2018-03-31 22:19:52 -04:00
diag.c	tipc: switch to rhashtable iterator	2018-08-29 18:04:54 -07:00
discover.c	tipc: fix lockdep warning when reinitilaizing sockets	2018-11-17 22:01:31 -08:00
discover.h	tipc: some cleanups in the file discover.c	2018-03-23 13:12:17 -04:00
eth_media.c	tipc: make media address offset a common define	2015-02-27 18:18:48 -05:00
group.c	tipc: fix info leak from kernel tipc_event	2018-10-18 16:49:53 -07:00
group.h	tipc: extend sock diag for group communication	2018-06-30 21:05:42 +09:00
ib_media.c	tipc: rename media/msg related definitions	2015-02-27 18:18:48 -05:00
Kconfig	tipc: implement socket diagnostics for AF_TIPC	2018-03-22 14:43:35 -04:00
link.c	tipc: fix uninitialized value for broadcast retransmission	2018-12-19 11:53:10 -08:00
link.h	tipc: add trace_events for tipc link	2018-12-19 11:49:24 -08:00
Makefile	tipc: enable tracepoints in tipc	2018-12-19 11:49:24 -08:00
monitor.c	tipc: make some functions static	2018-07-21 16:23:22 -07:00
monitor.h	tipc: dump monitor attributes	2016-07-26 14:26:42 -07:00
msg.c	tipc: buffer overflow handling in listener socket	2018-09-29 11:24:22 -07:00
msg.h	tipc: improve broadcast retransmission algorithm	2018-11-11 09:57:46 -08:00
name_distr.c	tipc: eliminate message disordering during binding table update	2018-10-22 19:29:12 -07:00
name_distr.h	tipc: permit overlapping service ranges in name table	2018-03-31 22:19:52 -04:00
name_table.c	tipc: eliminate message disordering during binding table update	2018-10-22 19:29:12 -07:00
name_table.h	tipc: eliminate message disordering during binding table update	2018-10-22 19:29:12 -07:00
net.c	tipc: fix lockdep warning when reinitilaizing sockets	2018-11-17 22:01:31 -08:00
net.h	tipc: fix lockdep warning when reinitilaizing sockets	2018-11-17 22:01:31 -08:00
netlink_compat.c	tipc: fix uninit-value in tipc_nl_compat_link_reset_stats	2019-01-15 20:29:20 -08:00
netlink.c	tipc: switch to rhashtable iterator	2018-08-29 18:04:54 -07:00
netlink.h	tipc: make cluster size threshold for monitoring configurable	2016-07-26 14:26:42 -07:00
node.c	tipc: add trace_events for tipc node	2018-12-19 11:49:24 -08:00
node.h	tipc: enable tracepoints in tipc	2018-12-19 11:49:24 -08:00
socket.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2018-12-20 11:53:36 -08:00
socket.h	tipc: add trace_events for tipc socket	2018-12-19 11:49:24 -08:00
subscr.c	tipc: fix unbalanced reference counter	2018-04-12 21:46:10 -04:00
subscr.h	tipc: replace name table service range array with rb tree	2018-03-31 22:19:52 -04:00
sysctl.c	tipc: add trace_events for tipc socket	2018-12-19 11:49:24 -08:00
topsrv.c	tipc: fix uninit-value in in tipc_conn_rcv_sub	2019-01-15 20:29:20 -08:00
topsrv.h	tipc: rename tipc_server to tipc_topsrv	2018-02-16 15:26:34 -05:00
trace.c	tipc: add trace_events for tipc socket	2018-12-19 11:49:24 -08:00
trace.h	tipc: add trace_events for tipc bearer	2018-12-19 11:49:25 -08:00
udp_media.c	tipc: compare remote and local protocols in tipc_udp_enable()	2018-12-14 13:28:03 -08:00
udp_media.h	tipc: implement configuration of UDP media MTU	2018-04-20 11:04:05 -04:00