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BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:199 [inline]
BUG: KASAN: use-after-free in sock_cgroup_ptr include/linux/cgroup.h:836 [inline]
BUG: KASAN: use-after-free in inet_diag_bc_sk+0xa5a/0xfa0 net/ipv4/inet_diag.c:749
Read of size 8 at addr ffff8880a40b9260 by task syz-executor.3/8419

CPU: 0 PID: 8419 Comm: syz-executor.3 Not tainted 5.7.0-rc2-syzkaller #0
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+0x128/0x182 lib/dump_stack.c:118
 print_address_description.constprop.8.cold.10+0x9/0x317 mm/kasan/report.c:382
 __kasan_report.cold.11+0x35/0x4d mm/kasan/report.c:511
 kasan_report+0x32/0x50 mm/kasan/common.c:625
 __read_once_size include/linux/compiler.h:199 [inline]
 sock_cgroup_ptr include/linux/cgroup.h:836 [inline]
 inet_diag_bc_sk+0xa5a/0xfa0 net/ipv4/inet_diag.c:749
 inet_diag_dump_icsk+0x98c/0xf30 net/ipv4/inet_diag.c:1061
 __inet_diag_dump+0xf7/0x1b0 net/ipv4/inet_diag.c:1113
 netlink_dump+0x481/0xf50 net/netlink/af_netlink.c:2245
 __netlink_dump_start+0x567/0x820 net/netlink/af_netlink.c:2353
 netlink_dump_start include/linux/netlink.h:246 [inline]
 inet_diag_handler_cmd+0x1fe/0x280 net/ipv4/inet_diag.c:1278
 __sock_diag_cmd net/core/sock_diag.c:233 [inline]
 sock_diag_rcv_msg+0x282/0x370 net/core/sock_diag.c:264
 netlink_rcv_skb+0x119/0x340 net/netlink/af_netlink.c:2469
 sock_diag_rcv+0x21/0x30 net/core/sock_diag.c:275
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0x434/0x630 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x714/0xc60 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xac/0xe0 net/socket.c:672
 sock_write_iter+0x218/0x380 net/socket.c:1004
 call_write_iter include/linux/fs.h:1907 [inline]
 do_iter_readv_writev+0x4f1/0x7c0 fs/read_write.c:694
 do_iter_write+0x129/0x540 fs/read_write.c:999
 vfs_writev+0x16d/0x2d0 fs/read_write.c:1072
 do_writev+0x214/0x280 fs/read_write.c:1115
 do_syscall_64+0xc6/0x620 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x45c829
Code: 0d 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fcea4a7cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 000000000050d140 RCX: 000000000045c829
RDX: 0000000000000001 RSI: 0000000020000140 RDI: 0000000000000005
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000d18 R14: 00000000004cb1f4 R15: 00007fcea4a7d6d4

The buggy address belongs to the page:
page:ffffea0002902e40 refcount:0 mapcount:0 mapping:00000000e34ef6da index:0x0
flags: 0xfffe0000000000()
raw: 00fffe0000000000 ffffea0002915208 ffff8880ae83b138 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a40b9100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880a40b9180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8880a40b9200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                       ^
 ffff8880a40b9280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880a40b9300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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