kasan: CONFIG_KASAN_INLINE enabled
==================================================================
BUG: KASAN: use-after-free in tipc_group_bc_cong+0x327/0x3f0 net/tipc/group.c:448
Read of size 2 at addr ffff8881cce3d774 by task syz-executor0/7729
kasan: GPF could be caused by NULL-ptr deref or user memory access
CPU: 0 PID: 7729 Comm: syz-executor0 Not tainted 4.20.0-rc6+ #347
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+0x244/0x39d lib/dump_stack.c:113
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 7724 Comm: syz-executor0 Not tainted 4.20.0-rc6+ #347
print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412
RIP: 0010:tipc_group_find_member net/tipc/group.c:239 [inline]
RIP: 0010:tipc_group_find_dest net/tipc/group.c:255 [inline]
RIP: 0010:tipc_group_cong+0xfb/0x5d0 net/tipc/group.c:416
Code: 85 63 04 00 00 48 8b 5b 10 e8 11 b2 d9 f9 48 85 db 0f 84 ba 00 00 00 e8 03 b2 d9 f9 48 8d bb 90 00 00 00 48 89 f8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 74 08 3c 03 0f 8e 23 04 00 00 48 8d bb 94 00
__asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:431
RSP: 0018:ffff88818faef1e8 EFLAGS: 00010202
tipc_group_bc_cong+0x327/0x3f0 net/tipc/group.c:448
RAX: 0000400160000052 RBX: 0002000b00000201 RCX: ffffc90005df6000
RDX: 00000000000004ad RSI: ffffffff87a5d28d RDI: 0002000b00000291
RBP: ffff88818faef2c8 R08: ffff8881ba73a400 R09: 0000000000000006
R10: 0000000000000000 R11: ffff8881ba73a400 R12: 00000000fbea371b
R13: 3c00405700000020 R14: ffff8881d11ac100 R15: dffffc0000000000
FS: 00007f09c06df700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
tipc_send_group_bcast+0x50a/0xd90 net/tipc/socket.c:1023
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f50bfbb1fb8 CR3: 00000001c6ff6000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__tipc_sendmsg+0xeec/0x1d40 net/tipc/socket.c:1307
tipc_group_bc_cong+0x2bd/0x3f0 net/tipc/group.c:459
tipc_send_group_bcast+0x50a/0xd90 net/tipc/socket.c:1023
__tipc_sendmsg+0xeec/0x1d40 net/tipc/socket.c:1307
tipc_sendmsg+0x50/0x70 net/tipc/socket.c:1272
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg+0xd5/0x120 net/socket.c:631
___sys_sendmsg+0x7fd/0x930 net/socket.c:2116
tipc_sendmsg+0x50/0x70 net/tipc/socket.c:1272
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg+0xd5/0x120 net/socket.c:631
___sys_sendmsg+0x7fd/0x930 net/socket.c:2116
__sys_sendmsg+0x11d/0x280 net/socket.c:2154
__do_sys_sendmsg net/socket.c:2163 [inline]
__se_sys_sendmsg net/socket.c:2161 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
__sys_sendmsg+0x11d/0x280 net/socket.c:2154
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457669
Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f09c06bdc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457669
__do_sys_sendmsg net/socket.c:2163 [inline]
__se_sys_sendmsg net/socket.c:2161 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000009
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f09c06be6d4
R13: 00000000004c44bd R14: 00000000004d74a8 R15: 00000000ffffffff
Allocated by task 7729:
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553
kmem_cache_alloc_trace+0x152/0x750 mm/slab.c:3620
entry_SYSCALL_64_after_hwframe+0x49/0xbe
kmalloc include/linux/slab.h:546 [inline]
kzalloc include/linux/slab.h:741 [inline]
tipc_group_create+0x152/0xa70 net/tipc/group.c:171
RIP: 0033:0x457669
tipc_sk_join net/tipc/socket.c:2829 [inline]
tipc_setsockopt+0x2d1/0xd70 net/tipc/socket.c:2944
Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
__sys_setsockopt+0x1ba/0x3c0 net/socket.c:1902
RSP: 002b:00007f09c06dec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
__do_sys_setsockopt net/socket.c:1913 [inline]
__se_sys_setsockopt net/socket.c:1910 [inline]
__x64_sys_setsockopt+0xbe/0x150 net/socket.c:1910
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457669
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000004
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f09c06df6d4
Freed by task 7735:
R13: 00000000004c44bd R14: 00000000004d74a8 R15: 00000000ffffffff
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
Modules linked in:
set_track mm/kasan/kasan.c:460 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
---[ end trace 26f694802da0fc28 ]---
kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
__cache_free mm/slab.c:3498 [inline]
kfree+0xcf/0x230 mm/slab.c:3817
tipc_group_delete+0x2e4/0x3f0 net/tipc/group.c:227
tipc_sk_leave+0x113/0x220 net/tipc/socket.c:2863
tipc_setsockopt+0x97d/0xd70 net/tipc/socket.c:2947
__sys_setsockopt+0x1ba/0x3c0 net/socket.c:1902
RIP: 0010:tipc_group_find_member net/tipc/group.c:239 [inline]
RIP: 0010:tipc_group_find_dest net/tipc/group.c:255 [inline]
RIP: 0010:tipc_group_cong+0xfb/0x5d0 net/tipc/group.c:416
__do_sys_setsockopt net/socket.c:1913 [inline]
__se_sys_setsockopt net/socket.c:1910 [inline]
__x64_sys_setsockopt+0xbe/0x150 net/socket.c:1910
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff8881cce3d700
which belongs to the cache kmalloc-192 of size 192
The buggy address is located 116 bytes inside of
192-byte region [ffff8881cce3d700, ffff8881cce3d7c0)
Code: 85 63 04 00 00 48 8b 5b 10 e8 11 b2 d9 f9 48 85 db 0f 84 ba 00 00 00 e8 03 b2 d9 f9 48 8d bb 90 00 00 00 48 89 f8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 74 08 3c 03 0f 8e 23 04 00 00 48 8d bb 94 00
The buggy address belongs to the page:
page:ffffea0007338f40 count:1 mapcount:0 mapping:ffff8881da800040 index:0x0
flags: 0x2fffc0000000200(slab)
raw: 02fffc0000000200 ffffea000766a2c8 ffffea000733ddc8 ffff8881da800040
raw: 0000000000000000 ffff8881cce3d000 0000000100000010 0000000000000000
page dumped because: kasan: bad access detected
RSP: 0018:ffff88818faef1e8 EFLAGS: 00010202
Memory state around the buggy address:
ffff8881cce3d600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff8881cce3d680: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881cce3d700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8881cce3d780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
RAX: 0000400160000052 RBX: 0002000b00000201 RCX: ffffc90005df6000
ffff8881cce3d800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
ip6_tunnel: ip6tnl1 xmit: Local address not yet configured!
RDX: 00000000000004ad RSI: ffffffff87a5d28d RDI: 0002000b00000291
kobject: 'loop4' (00000000314e31bb): kobject_uevent_env
RBP: ffff88818faef2c8 R08: ffff8881ba73a400 R09: 0000000000000006
kobject: 'loop4' (00000000314e31bb): fill_kobj_path: path = '/devices/virtual/block/loop4'
R10: 0000000000000000 R11: ffff8881ba73a400 R12: 00000000fbea371b