==================================================================
BUG: KASAN: use-after-free in get_disk_and_module block/genhd.c:1787 [inline]
BUG: KASAN: use-after-free in exact_lock+0x38/0xd0 block/genhd.c:677
Read of size 8 at addr ffff8881009a7460 by task syz.0.7334/25293

CPU: 1 PID: 25293 Comm: syz.0.7334 Tainted: G        W         5.10.234-syzkaller-00023-g3f5f2283d684 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 print_address_description+0x81/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:452
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309
 get_disk_and_module block/genhd.c:1787 [inline]
 exact_lock+0x38/0xd0 block/genhd.c:677
 kobj_lookup+0x294/0x430 drivers/base/map.c:119
 get_gendisk+0xf7/0x3d0 block/genhd.c:1001
 bdev_get_gendisk fs/block_dev.c:1110 [inline]
 __blkdev_get+0x18c/0x12f0 fs/block_dev.c:1474
 blkdev_get fs/block_dev.c:1653 [inline]
 blkdev_get_by_path+0x25a/0x480 fs/block_dev.c:1690
 mount_bdev+0x51/0x370 fs/super.c:1400
 vfat_mount+0x34/0x40 fs/fat/namei_vfat.c:1057
 legacy_get_tree+0xf1/0x190 fs/fs_context.c:593
 vfs_get_tree+0x88/0x290 fs/super.c:1572
 do_new_mount+0x2ba/0xb30 fs/namespace.c:2917
 path_mount+0x56f/0xcb0 fs/namespace.c:3247
 do_mount fs/namespace.c:3260 [inline]
 __do_sys_mount fs/namespace.c:3468 [inline]
 __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3445
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3445
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f98f1e2f169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f98f0499038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f98f2047fa0 RCX: 00007f98f1e2f169
RDX: 0000400000001200 RSI: 00004000000000c0 RDI: 00004000000001c0
RBP: 00007f98f1eb02a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f98f2047fa0 R15: 00007fffdde4fae8

Allocated by task 23867:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:430 [inline]
 ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:509
 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:518
 kasan_kmalloc include/linux/kasan.h:254 [inline]
 kmem_cache_alloc_trace+0x18a/0x2e0 mm/slub.c:2974
 kmalloc include/linux/slab.h:552 [inline]
 kzalloc include/linux/slab.h:664 [inline]
 do_check_common+0x188/0x1370 kernel/bpf/verifier.c:12004
 do_check_main kernel/bpf/verifier.c:12110 [inline]
 bpf_check+0xb551/0xf230 kernel/bpf/verifier.c:12665
 bpf_prog_load kernel/bpf/syscall.c:2239 [inline]
 __do_sys_bpf kernel/bpf/syscall.c:4440 [inline]
 __se_sys_bpf+0x107a2/0x11cb0 kernel/bpf/syscall.c:4396
 __x64_sys_bpf+0x7b/0x90 kernel/bpf/syscall.c:4396
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Freed by task 5084:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x121/0x160 mm/kasan/common.c:362
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370
 kasan_slab_free include/linux/kasan.h:220 [inline]
 slab_free_hook mm/slub.c:1595 [inline]
 slab_free_freelist_hook+0xc0/0x190 mm/slub.c:1621
 slab_free mm/slub.c:3203 [inline]
 kfree+0xc3/0x270 mm/slub.c:4191
 skb_free_head net/core/skbuff.c:606 [inline]
 skb_release_data+0x5c6/0x6f0 net/core/skbuff.c:626
 skb_release_all net/core/skbuff.c:680 [inline]
 __kfree_skb net/core/skbuff.c:694 [inline]
 kfree_skb+0xb9/0x320 net/core/skbuff.c:713
 ip_rcv_finish_core+0xb28/0x12f0 net/ipv4/ip_input.c:412
 ip_list_rcv_finish net/ipv4/ip_input.c:590 [inline]
 ip_sublist_rcv+0x28e/0x990 net/ipv4/ip_input.c:616
 ip_list_rcv+0x422/0x470 net/ipv4/ip_input.c:651
 __netif_receive_skb_list_ptype net/core/dev.c:5444 [inline]
 __netif_receive_skb_list_core+0x6b1/0x890 net/core/dev.c:5492
 __netif_receive_skb_list net/core/dev.c:5544 [inline]
 netif_receive_skb_list_internal+0x967/0xcc0 net/core/dev.c:5654
 gro_normal_list net/core/dev.c:5808 [inline]
 napi_complete_done+0x344/0x750 net/core/dev.c:6557
 wg_packet_rx_poll+0x1ab5/0x1b40 drivers/net/wireguard/receive.c:495
 napi_poll net/core/dev.c:6873 [inline]
 net_rx_action+0x516/0x10d0 net/core/dev.c:6943
 __do_softirq+0x268/0x5bb kernel/softirq.c:309

Last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xd3/0x100 mm/kasan/generic.c:348
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358
 kvfree_call_rcu+0x136/0x650 kernel/rcu/tree.c:3535
 drop_sysctl_table+0x311/0x450 fs/proc/proc_sysctl.c:1680
 unregister_sysctl_table+0x76/0x120 fs/proc/proc_sysctl.c:1718
 unregister_net_sysctl_table+0x15/0x20 net/sysctl_net.c:127
 __devinet_sysctl_unregister net/ipv4/devinet.c:2621 [inline]
 devinet_exit_net+0x1a8/0x230 net/ipv4/devinet.c:2766
 ops_exit_list net/core/net_namespace.c:185 [inline]
 cleanup_net+0x66c/0xcb0 net/core/net_namespace.c:609
 process_one_work+0x6dc/0xbd0 kernel/workqueue.c:2301
 worker_thread+0xaea/0x1510 kernel/workqueue.c:2447
 kthread+0x34b/0x3d0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Second to last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xd3/0x100 mm/kasan/generic.c:348
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358
 kvfree_call_rcu+0x136/0x650 kernel/rcu/tree.c:3535
 drop_sysctl_table+0x311/0x450 fs/proc/proc_sysctl.c:1680
 unregister_sysctl_table+0x76/0x120 fs/proc/proc_sysctl.c:1718
 unregister_net_sysctl_table+0x15/0x20 net/sysctl_net.c:127
 __devinet_sysctl_unregister net/ipv4/devinet.c:2621 [inline]
 devinet_sysctl_unregister net/ipv4/devinet.c:2649 [inline]
 inetdev_destroy net/ipv4/devinet.c:326 [inline]
 inetdev_event+0x76f/0x1040 net/ipv4/devinet.c:1612
 notifier_call_chain kernel/notifier.c:83 [inline]
 raw_notifier_call_chain+0x8c/0xf0 kernel/notifier.c:410
 call_netdevice_notifiers_info net/core/dev.c:2054 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2066 [inline]
 call_netdevice_notifiers net/core/dev.c:2080 [inline]
 unregister_netdevice_many+0xde7/0x17d0 net/core/dev.c:10766
 default_device_exit_batch+0x38a/0x3f0 net/core/dev.c:11286
 ops_exit_list net/core/net_namespace.c:190 [inline]
 cleanup_net+0x6e9/0xcb0 net/core/net_namespace.c:609
 process_one_work+0x6dc/0xbd0 kernel/workqueue.c:2301
 worker_thread+0xaea/0x1510 kernel/workqueue.c:2447
 kthread+0x34b/0x3d0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

The buggy address belongs to the object at ffff8881009a7000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1120 bytes inside of
 2048-byte region [ffff8881009a7000, ffff8881009a7800)
The buggy address belongs to the page:
page:ffffea0004026800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1009a0
head:ffffea0004026800 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head)
raw: 4000000000010200 0000000000000000 0000000600000001 ffff888100042d80
raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, ts 1908343386, free_ts 0
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x166/0x180 mm/page_alloc.c:2462
 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5348
 allocate_slab mm/slub.c:1808 [inline]
 new_slab+0x80/0x400 mm/slub.c:1869
 new_slab_objects mm/slub.c:2627 [inline]
 ___slab_alloc+0x302/0x4b0 mm/slub.c:2791
 __slab_alloc+0x63/0xa0 mm/slub.c:2831
 slab_alloc_node mm/slub.c:2913 [inline]
 slab_alloc mm/slub.c:2955 [inline]
 kmem_cache_alloc_trace+0x1bd/0x2e0 mm/slub.c:2972
 kmem_cache_alloc_node_trace include/linux/slab.h:440 [inline]
 kmalloc_node include/linux/slab.h:570 [inline]
 kzalloc_node include/linux/slab.h:675 [inline]
 __alloc_disk_node+0x76/0x570 block/genhd.c:1727
 brd_alloc+0x146/0x400 drivers/block/brd.c:394
 brd_init+0x125/0x474 drivers/block/brd.c:517
 do_one_initcall+0x189/0x620 init/main.c:1197
 do_initcall_level+0x186/0x304 init/main.c:1270
 do_initcalls+0x4e/0x8e init/main.c:1286
 do_basic_setup+0x88/0x91 init/main.c:1306
 kernel_init_freeable+0x2be/0x3f5 init/main.c:1510
 kernel_init+0x11/0x280 init/main.c:1397
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8881009a7300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881009a7380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881009a7400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff8881009a7480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881009a7500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
general protection fault, probably for non-canonical address 0xed3529d1df9f7ea0: 0000 [#1] PREEMPT SMP KASAN
KASAN: maybe wild-memory-access in range [0x69a96e8efcfbf500-0x69a96e8efcfbf507]
CPU: 0 PID: 25293 Comm: syz.0.7334 Tainted: G    B   W         5.10.234-syzkaller-00023-g3f5f2283d684 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:get_disk_and_module block/genhd.c:1789 [inline]
RIP: 0010:exact_lock+0x4b/0xd0 block/genhd.c:677
Code: 00 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 38 21 60 ff 48 8b 1b 48 85 db 74 35 48 83 c3 68 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 16 21 60 ff 4c 8b 33 4d 85 f6 74
RSP: 0018:ffffc90000fff870 EFLAGS: 00010207
RAX: 0d352dd1df9f7ea0 RBX: 69a96e8efcfbf505 RCX: 0000000000080000
RDX: ffffc90001699000 RSI: 0000000000000286 RDI: 0000000000019a11
RBP: ffffc90000fff888 R08: ffffffff813e2b8b R09: 0000000000000003
R10: fffffbfff0e11248 R11: dffffc0000000001 R12: ffffffff82483d10
R13: 0000000000700001 R14: dffffc0000000000 R15: ffff8881009a7000
FS:  00007f98f04996c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c286c0d CR3: 000000011d398000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kobj_lookup+0x294/0x430 drivers/base/map.c:119
 get_gendisk+0xf7/0x3d0 block/genhd.c:1001
 bdev_get_gendisk fs/block_dev.c:1110 [inline]
 __blkdev_get+0x18c/0x12f0 fs/block_dev.c:1474
 blkdev_get fs/block_dev.c:1653 [inline]
 blkdev_get_by_path+0x25a/0x480 fs/block_dev.c:1690
 mount_bdev+0x51/0x370 fs/super.c:1400
 vfat_mount+0x34/0x40 fs/fat/namei_vfat.c:1057
 legacy_get_tree+0xf1/0x190 fs/fs_context.c:593
 vfs_get_tree+0x88/0x290 fs/super.c:1572
 do_new_mount+0x2ba/0xb30 fs/namespace.c:2917
 path_mount+0x56f/0xcb0 fs/namespace.c:3247
 do_mount fs/namespace.c:3260 [inline]
 __do_sys_mount fs/namespace.c:3468 [inline]
 __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3445
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3445
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f98f1e2f169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f98f0499038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f98f2047fa0 RCX: 00007f98f1e2f169
RDX: 0000400000001200 RSI: 00004000000000c0 RDI: 00004000000001c0
RBP: 00007f98f1eb02a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f98f2047fa0 R15: 00007fffdde4fae8
Modules linked in:
---[ end trace 467f95627e1017da ]---
RIP: 0010:get_disk_and_module block/genhd.c:1789 [inline]
RIP: 0010:exact_lock+0x4b/0xd0 block/genhd.c:677
Code: 00 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 38 21 60 ff 48 8b 1b 48 85 db 74 35 48 83 c3 68 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 16 21 60 ff 4c 8b 33 4d 85 f6 74
RSP: 0018:ffffc90000fff870 EFLAGS: 00010207
RAX: 0d352dd1df9f7ea0 RBX: 69a96e8efcfbf505 RCX: 0000000000080000
RDX: ffffc90001699000 RSI: 0000000000000286 RDI: 0000000000019a11
RBP: ffffc90000fff888 R08: ffffffff813e2b8b R09: 0000000000000003
R10: fffffbfff0e11248 R11: dffffc0000000001 R12: ffffffff82483d10
R13: 0000000000700001 R14: dffffc0000000000 R15: ffff8881009a7000
FS:  00007f98f04996c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff80000000 CR3: 000000011d398000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 48 89             	add    %cl,-0x77(%rax)
   3:	d8 48 c1             	fmuls  -0x3f(%rax)
   6:	e8 03 42 80 3c       	call   0x3c80420e
   b:	30 00                	xor    %al,(%rax)
   d:	74 08                	je     0x17
   f:	48 89 df             	mov    %rbx,%rdi
  12:	e8 38 21 60 ff       	call   0xff60214f
  17:	48 8b 1b             	mov    (%rbx),%rbx
  1a:	48 85 db             	test   %rbx,%rbx
  1d:	74 35                	je     0x54
  1f:	48 83 c3 68          	add    $0x68,%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 30 00       	cmpb   $0x0,(%rax,%r14,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 16 21 60 ff       	call   0xff60214f
  39:	4c 8b 33             	mov    (%rbx),%r14
  3c:	4d 85 f6             	test   %r14,%r14
  3f:	74                   	.byte 0x74