IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
8021q: adding VLAN 0 to HW filter on device batadv0
==================================================================
BUG: KASAN: use-after-free in smc_diag_msg_common_fill net/smc/smc_diag.c:43 [inline]
BUG: KASAN: use-after-free in __smc_diag_dump.isra.4+0x2792/0x2ae0 net/smc/smc_diag.c:93
Read of size 8 at addr ffff888089d51160 by task syz-executor0/8279

CPU: 0 PID: 8279 Comm: syz-executor0 Not tainted 4.20.0+ #298
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+0x1d3/0x2c6 lib/dump_stack.c:113
 print_address_description.cold.5+0x9/0x1ff mm/kasan/report.c:187
 kasan_report.cold.6+0x1b/0x39 mm/kasan/report.c:317
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135
 smc_diag_msg_common_fill net/smc/smc_diag.c:43 [inline]
 __smc_diag_dump.isra.4+0x2792/0x2ae0 net/smc/smc_diag.c:93
 smc_diag_dump_proto.isra.5+0x2e8/0x3c0 net/smc/smc_diag.c:211
 smc_diag_dump+0x26/0x70 net/smc/smc_diag.c:225
 netlink_dump+0x600/0x1080 net/netlink/af_netlink.c:2244
 __netlink_dump_start+0x59a/0x7c0 net/netlink/af_netlink.c:2352
 netlink_dump_start include/linux/netlink.h:225 [inline]
 smc_diag_handler_dump+0x2a3/0x350 net/smc/smc_diag.c:242
 __sock_diag_cmd net/core/sock_diag.c:232 [inline]
 sock_diag_rcv_msg+0x31d/0x410 net/core/sock_diag.c:263
 netlink_rcv_skb+0x16c/0x430 net/netlink/af_netlink.c:2477
 sock_diag_rcv+0x2a/0x40 net/core/sock_diag.c:274
 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
 netlink_unicast+0x59f/0x750 net/netlink/af_netlink.c:1336
 netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1917
 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
 __compat_sys_sendmsg net/compat.c:754 [inline]
 __do_compat_sys_sendmsg net/compat.c:761 [inline]
 __se_compat_sys_sendmsg net/compat.c:758 [inline]
 __ia32_compat_sys_sendmsg+0x7a/0xb0 net/compat.c:758
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f23849
Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f7f1f0cc EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000020000040
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 8279:
 save_stack+0x43/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 kasan_kmalloc+0xcb/0xd0 mm/kasan/common.c:482
 kasan_slab_alloc+0x12/0x20 mm/kasan/common.c:397
 kmem_cache_alloc+0x130/0x730 mm/slab.c:3541
 sock_alloc_inode+0x1d/0x260 net/socket.c:244
 alloc_inode+0x63/0x190 fs/inode.c:210
 new_inode_pseudo+0x71/0x1a0 fs/inode.c:906
 sock_alloc+0x41/0x270 net/socket.c:547
 __sock_create+0x175/0x930 net/socket.c:1241
 sock_create_kern+0x3b/0x50 net/socket.c:1323
 smc_create+0x17c/0x3b0 net/smc/af_smc.c:1921
 __sock_create+0x536/0x930 net/socket.c:1277
 sock_create net/socket.c:1317 [inline]
 __sys_socket+0x106/0x260 net/socket.c:1347
 __do_sys_socket net/socket.c:1356 [inline]
 __se_sys_socket net/socket.c:1354 [inline]
 __ia32_sys_socket+0x73/0xb0 net/socket.c:1354
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139

Freed by task 8278:
 save_stack+0x43/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:444
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:452
 __cache_free mm/slab.c:3485 [inline]
 kmem_cache_free+0x83/0x290 mm/slab.c:3747
 sock_destroy_inode+0x51/0x60 net/socket.c:272
 destroy_inode+0x159/0x200 fs/inode.c:267
 evict+0x5e0/0x980 fs/inode.c:575
 iput_final fs/inode.c:1550 [inline]
 iput+0x679/0xa90 fs/inode.c:1576
 __sock_release+0x1ec/0x250 net/socket.c:590
 sock_release+0x17/0x20 net/socket.c:598
 smc_release+0x297/0x9a0 net/smc/af_smc.c:155
 __sock_release+0xd7/0x250 net/socket.c:579
 sock_close+0x19/0x20 net/socket.c:1141
 __fput+0x385/0xa50 fs/file_table.c:278
 ____fput+0x15/0x20 fs/file_table.c:309
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_32_irqs_on arch/x86/entry/common.c:341 [inline]
 do_fast_syscall_32+0xcd5/0xfb2 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139

The buggy address belongs to the object at ffff888089d51140
 which belongs to the cache sock_inode_cache(17:syz0) of size 976
The buggy address is located 32 bytes inside of
 976-byte region [ffff888089d51140, ffff888089d51510)
The buggy address belongs to the page:
page:ffffea0002275440 count:1 mapcount:0 mapping:ffff88809a781980 index:0xffff888089d51ffd
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea00022746c8 ffffea00025ba908 ffff88809a781980
raw: ffff888089d51ffd ffff888089d51140 0000000100000003 ffff888085e92d80
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff888085e92d80

Memory state around the buggy address:
 ffff888089d51000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888089d51080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888089d51100: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
                                                       ^
 ffff888089d51180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888089d51200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================