general protection fault in xfrm_lookup_with_ifid

From: syzbot
Date: Mon Mar 11 2019 - 02:17:10 EST

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Hello,

syzbot found the following crash on:

HEAD commit: d9862cfb Merge tag 'mips_5.1' of git://git.kernel.org/pub/..
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1160d5db200000
kernel config: https://syzkaller.appspot.com/x/.config?x=73d88a42238825ad
dashboard link: https://syzkaller.appspot.com/bug?extid=2a7531cd068ddc9932f9
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
userspace arch: amd64

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+2a7531cd068ddc9932f9@xxxxxxxxxxxxxxxxxxxxxxxxx

netlink: 'syz-executor.3': attribute type 1 has an invalid length.
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 'syz-executor.3': attribute type 1 has an invalid length.
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 13518 Comm: syz-executor.0 Not tainted 5.0.0+ #97
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:xfrm_lookup_with_ifid+0xf0/0x1cd0 net/xfrm/xfrm_policy.c:3027
Code: c1 e8 03 42 80 3c 28 00 0f 85 c3 19 00 00 48 8b 85 f0 fe ff ff 4c 8b 68 08 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 01 0f 8e 93 15 00 00 41 0f b7 45 00 4d
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'.
RSP: 0018:ffff8880ae906d10 EFLAGS: 00010a06
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff8880429ecf00
RDX: 10c1072800000000 RSI: ffffffff85ff59da RDI: ffff8880a53d0040
RBP: ffff8880ae906e60 R08: 0000000000000006 R09: 0000000000000000
R10: ffffed1015d25bcf R11: 0000000000000000 R12: ffff8880429ecf00
R13: 8608394000000000 R14: ffff8880a11c769c R15: ffff8880ae906e38
FS: 00007f08dc344700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
kobject: 'loop4' (000000008af853b7): kobject_uevent_env
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kobject: 'loop4' (000000008af853b7): fill_kobj_path: path = '/devices/virtual/block/loop4'
CR2: 0000000000a5048d CR3: 000000009d7a7000 CR4: 00000000001406e0
Call Trace:
<IRQ>
kobject: 'loop1' (000000005d69384c): kobject_uevent_env
kobject: 'loop1' (000000005d69384c): fill_kobj_path: path = '/devices/virtual/block/loop1'
xfrm_lookup net/xfrm/xfrm_policy.c:3175 [inline]
xfrm_lookup_route+0x3b/0x1f0 net/xfrm/xfrm_policy.c:3186
ip6_dst_lookup_flow+0x189/0x220 net/ipv6/ip6_output.c:1098
sctp_v6_get_dst+0x785/0x1d80 net/sctp/ipv6.c:293
kobject: 'loop3' (0000000061a5c8dc): kobject_uevent_env
kobject: 'loop3' (0000000061a5c8dc): fill_kobj_path: path = '/devices/virtual/block/loop3'
sctp_transport_route+0x132/0x370 net/sctp/transport.c:312
sctp_assoc_add_peer+0x53e/0xfc0 net/sctp/associola.c:678
sctp_process_param net/sctp/sm_make_chunk.c:2548 [inline]
sctp_process_init+0x249f/0x2b20 net/sctp/sm_make_chunk.c:2361
kobject: 'loop4' (000000008af853b7): kobject_uevent_env
kobject: 'loop4' (000000008af853b7): fill_kobj_path: path = '/devices/virtual/block/loop4'
sctp_sf_do_5_1B_init+0x8ba/0xe50 net/sctp/sm_statefuns.c:416
sctp_do_sm+0x124/0x5390 net/sctp/sm_sideeffect.c:1188
kobject: 'loop2' (00000000daab3d23): kobject_uevent_env
kobject: 'loop2' (00000000daab3d23): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop5' (0000000023199259): kobject_uevent_env
kobject: 'loop5' (0000000023199259): fill_kobj_path: path = '/devices/virtual/block/loop5'
sctp_endpoint_bh_rcv+0x451/0x950 net/sctp/endpointola.c:456
sctp_inq_push+0x1ea/0x290 net/sctp/inqueue.c:95
sctp_rcv+0x27d9/0x3550 net/sctp/input.c:271
sctp6_rcv+0x17/0x30 net/sctp/ipv6.c:1063
ip6_protocol_deliver_rcu+0x303/0x16c0 net/ipv6/ip6_input.c:394
ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:434
NF_HOOK include/linux/netfilter.h:289 [inline]
NF_HOOK include/linux/netfilter.h:283 [inline]
ip6_input+0xe4/0x3f0 net/ipv6/ip6_input.c:443
dst_input include/net/dst.h:450 [inline]
ip6_rcv_finish+0x1e7/0x320 net/ipv6/ip6_input.c:76
NF_HOOK include/linux/netfilter.h:289 [inline]
NF_HOOK include/linux/netfilter.h:283 [inline]
ipv6_rcv+0x10e/0x420 net/ipv6/ip6_input.c:272
__netif_receive_skb_one_core+0x115/0x1a0 net/core/dev.c:4973
__netif_receive_skb+0x2c/0x1c0 net/core/dev.c:5083
process_backlog+0x206/0x750 net/core/dev.c:5923
napi_poll net/core/dev.c:6346 [inline]
net_rx_action+0x4fa/0x1070 net/core/dev.c:6412
__do_softirq+0x266/0x95a kernel/softirq.c:292
do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1027
</IRQ>
do_softirq.part.0+0x11a/0x170 kernel/softirq.c:337
do_softirq kernel/softirq.c:329 [inline]
__local_bh_enable_ip+0x211/0x270 kernel/softirq.c:189
local_bh_enable include/linux/bottom_half.h:32 [inline]
rcu_read_unlock_bh include/linux/rcupdate.h:696 [inline]
ip6_finish_output2+0xbcf/0x2550 net/ipv6/ip6_output.c:121
ip6_finish_output+0x577/0xc30 net/ipv6/ip6_output.c:154
NF_HOOK_COND include/linux/netfilter.h:278 [inline]
ip6_output+0x235/0x7f0 net/ipv6/ip6_output.c:171
dst_output include/net/dst.h:444 [inline]
NF_HOOK include/linux/netfilter.h:289 [inline]
NF_HOOK include/linux/netfilter.h:283 [inline]
ip6_xmit+0xe41/0x20c0 net/ipv6/ip6_output.c:275
sctp_v6_xmit+0x313/0x660 net/sctp/ipv6.c:232
sctp_packet_transmit+0x1b8b/0x3660 net/sctp/output.c:641
sctp_packet_singleton net/sctp/outqueue.c:787 [inline]
sctp_outq_flush_ctrl.constprop.0+0x741/0xd40 net/sctp/outqueue.c:918
sctp_outq_flush+0xe8/0x2790 net/sctp/outqueue.c:1200
sctp_outq_uncork+0x6c/0x80 net/sctp/outqueue.c:772
sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1820 [inline]
sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline]
sctp_do_sm+0x513/0x5390 net/sctp/sm_sideeffect.c:1191
sctp_primitive_ASSOCIATE+0x9d/0xd0 net/sctp/primitive.c:88
__sctp_connect+0x8cd/0xce0 net/sctp/socket.c:1226
__sctp_setsockopt_connectx+0x133/0x1a0 net/sctp/socket.c:1349
sctp_setsockopt_connectx_old net/sctp/socket.c:1365 [inline]
sctp_setsockopt net/sctp/socket.c:4617 [inline]
sctp_setsockopt+0x22cc/0x68a0 net/sctp/socket.c:4581
sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:3120
__sys_setsockopt+0x180/0x280 net/socket.c:1923
__do_sys_setsockopt net/socket.c:1934 [inline]
__se_sys_setsockopt net/socket.c:1931 [inline]
__x64_sys_setsockopt+0xbe/0x150 net/socket.c:1931
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457f29
Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f08dc343c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457f29
RDX: 000000000000006b RSI: 0000000000000084 RDI: 0000000000000006
RBP: 000000000073bfa0 R08: 000000000000001c R09: 0000000000000000
R10: 000000002055bfe4 R11: 0000000000000246 R12: 00007f08dc3446d4
R13: 00000000004ccac8 R14: 00000000004da830 R15: 00000000ffffffff
Modules linked in:
---[ end trace 7de77d1b835299f5 ]---
RIP: 0010:xfrm_lookup_with_ifid+0xf0/0x1cd0 net/xfrm/xfrm_policy.c:3027
Code: c1 e8 03 42 80 3c 28 00 0f 85 c3 19 00 00 48 8b 85 f0 fe ff ff 4c 8b 68 08 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 01 0f 8e 93 15 00 00 41 0f b7 45 00 4d
RSP: 0018:ffff8880ae906d10 EFLAGS: 00010a06
kobject: 'loop1' (000000005d69384c): kobject_uevent_env
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff8880429ecf00
RDX: 10c1072800000000 RSI: ffffffff85ff59da RDI: ffff8880a53d0040
RBP: ffff8880ae906e60 R08: 0000000000000006 R09: 0000000000000000
R10: ffffed1015d25bcf R11: 0000000000000000 R12: ffff8880429ecf00
kobject: 'loop1' (000000005d69384c): fill_kobj_path: path = '/devices/virtual/block/loop1'
R13: 8608394000000000 R14: ffff8880a11c769c R15: ffff8880ae906e38
FS: 00007f08dc344700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000a5048d CR3: 000000009d7a7000 CR4: 00000000001406e0

---
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Next message: Kangjie Lu: "[PATCH] net: fm10k: fix a potential NULL pointer dereference"
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