==================================================================
BUG: KASAN: slab-use-after-free in sysfs_remove_file_ns+0x63/0x70 fs/sysfs/file.c:510
Read of size 8 at addr ffff888034ec1830 by task syz.1.508/8127

CPU: 1 UID: 0 PID: 8127 Comm: syz.1.508 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 sysfs_remove_file_ns+0x63/0x70 fs/sysfs/file.c:510
 sysfs_remove_file include/linux/sysfs.h:770 [inline]
 driver_remove_file drivers/base/driver.c:201 [inline]
 driver_remove_file+0x4a/0x60 drivers/base/driver.c:197
 remove_bind_files drivers/base/bus.c:605 [inline]
 bus_remove_driver+0x224/0x2c0 drivers/base/bus.c:743
 driver_unregister+0x76/0xb0 drivers/base/driver.c:277
 comedi_device_detach_locked+0x12f/0xa50 drivers/comedi/drivers.c:207
 do_devconfig_ioctl+0x555/0x710 drivers/comedi/comedi_fops.c:848
 comedi_unlocked_ioctl+0x165d/0x2f00 drivers/comedi/comedi_fops.c:2178
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0e44b8efc9
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:00007f0e45a05038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f0e44de6180 RCX: 00007f0e44b8efc9
RDX: 0000000000000000 RSI: 0000000040946400 RDI: 0000000000000007
RBP: 00007f0e44c11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0e44de6218 R14: 00007f0e44de6180 R15: 00007ffc639975a8
 </TASK>

Allocated by task 8059:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
 kasan_save_track+0x14/0x30 mm/kasan/common.c:77
 poison_kmalloc_redzone mm/kasan/common.c:400 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:417
 kmalloc_noprof include/linux/slab.h:957 [inline]
 siw_cm_alloc_work drivers/infiniband/sw/siw/siw_cm.c:288 [inline]
 siw_create_listen+0x5b4/0x1320 drivers/infiniband/sw/siw/siw_cm.c:1830
 iw_cm_listen+0x172/0x1f0 drivers/infiniband/core/iwcm.c:586
 cma_iw_listen drivers/infiniband/core/cma.c:2688 [inline]
 rdma_listen+0x7ef/0xe30 drivers/infiniband/core/cma.c:3978
 cma_listen_on_dev+0x4dc/0x810 drivers/infiniband/core/cma.c:2747
 cma_add_one+0x790/0xdd0 drivers/infiniband/core/cma.c:5382
 add_client_context+0x3de/0x590 drivers/infiniband/core/device.c:757
 enable_device_and_get+0x1d4/0x3f0 drivers/infiniband/core/device.c:1368
 ib_register_device drivers/infiniband/core/device.c:1487 [inline]
 ib_register_device+0x87f/0xe00 drivers/infiniband/core/device.c:1433
 siw_device_register drivers/infiniband/sw/siw/siw_main.c:71 [inline]
 siw_newlink drivers/infiniband/sw/siw/siw_main.c:430 [inline]
 siw_newlink+0xb67/0xd70 drivers/infiniband/sw/siw/siw_main.c:412
 nldev_newlink+0x3a6/0x680 drivers/infiniband/core/nldev.c:1797
 rdma_nl_rcv_msg+0x38a/0x6e0 drivers/infiniband/core/netlink.c:195
 rdma_nl_rcv_skb.constprop.0.isra.0+0x2d0/0x430 drivers/infiniband/core/netlink.c:239
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x8c8/0xdd0 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 ____sys_sendmsg+0xa98/0xc70 net/socket.c:2630
 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2684
 __sys_sendmsg+0x16d/0x220 net/socket.c:2716
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 8059:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
 kasan_save_track+0x14/0x30 mm/kasan/common.c:77
 __kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:587
 kasan_save_free_info mm/kasan/kasan.h:406 [inline]
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2523 [inline]
 slab_free mm/slub.c:6611 [inline]
 kfree+0x2b8/0x6d0 mm/slub.c:6818
 siw_cm_free_work+0x147/0x220 drivers/infiniband/sw/siw/siw_cm.c:192
 __siw_cep_dealloc drivers/infiniband/sw/siw/siw_cm.c:258 [inline]
 kref_put include/linux/kref.h:65 [inline]
 siw_cep_put+0x191/0x410 drivers/infiniband/sw/siw/siw_cm.c:448
 siw_cep_set_free_and_put drivers/infiniband/sw/siw/siw_cm.c:454 [inline]
 siw_drop_listeners drivers/infiniband/sw/siw/siw_cm.c:1925 [inline]
 siw_destroy_listen+0x319/0x5d0 drivers/infiniband/sw/siw/siw_cm.c:1935
 destroy_cm_id+0x1fe/0x5b0 drivers/infiniband/core/iwcm.c:402
 iw_destroy_cm_id+0x1d/0xa0 drivers/infiniband/core/iwcm.c:454
 _destroy_id+0x770/0xf30 drivers/infiniband/core/cma.c:2063
 cma_send_device_removal_put drivers/infiniband/core/cma.c:5283 [inline]
 cma_process_remove+0x478/0x600 drivers/infiniband/core/cma.c:5308
 cma_add_one+0x8ba/0xdd0 drivers/infiniband/core/cma.c:5396
 add_client_context+0x3de/0x590 drivers/infiniband/core/device.c:757
 enable_device_and_get+0x1d4/0x3f0 drivers/infiniband/core/device.c:1368
 ib_register_device drivers/infiniband/core/device.c:1487 [inline]
 ib_register_device+0x87f/0xe00 drivers/infiniband/core/device.c:1433
 siw_device_register drivers/infiniband/sw/siw/siw_main.c:71 [inline]
 siw_newlink drivers/infiniband/sw/siw/siw_main.c:430 [inline]
 siw_newlink+0xb67/0xd70 drivers/infiniband/sw/siw/siw_main.c:412
 nldev_newlink+0x3a6/0x680 drivers/infiniband/core/nldev.c:1797
 rdma_nl_rcv_msg+0x38a/0x6e0 drivers/infiniband/core/netlink.c:195
 rdma_nl_rcv_skb.constprop.0.isra.0+0x2d0/0x430 drivers/infiniband/core/netlink.c:239
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x8c8/0xdd0 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 ____sys_sendmsg+0xa98/0xc70 net/socket.c:2630
 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2684
 __sys_sendmsg+0x16d/0x220 net/socket.c:2716
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888034ec1800
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 48 bytes inside of
 freed 256-byte region [ffff888034ec1800, ffff888034ec1900)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x34ec0
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88813ff26b40 ffffea0001fd8f00 dead000000000004
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88813ff26b40 ffffea0001fd8f00 dead000000000004
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000001 ffffea0000d3b001 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 14036139830, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1850
 prep_new_page mm/page_alloc.c:1858 [inline]
 get_page_from_freelist+0x10a3/0x3a30 mm/page_alloc.c:3884
 __alloc_frozen_pages_noprof+0x25f/0x2470 mm/page_alloc.c:5183
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
 alloc_slab_page mm/slub.c:3039 [inline]
 allocate_slab mm/slub.c:3212 [inline]
 new_slab+0x24a/0x360 mm/slub.c:3266
 ___slab_alloc+0xdc4/0x1ae0 mm/slub.c:4636
 __slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4755
 __slab_alloc_node mm/slub.c:4831 [inline]
 slab_alloc_node mm/slub.c:5253 [inline]
 __do_kmalloc_node mm/slub.c:5626 [inline]
 __kmalloc_node_track_caller_noprof+0x4db/0x8a0 mm/slub.c:5736
 __do_krealloc mm/slub.c:6960 [inline]
 krealloc_node_align_noprof+0x1b6/0x470 mm/slub.c:7019
 add_sysfs_param+0xde/0xa10 kernel/params.c:655
 kernel_add_sysfs_param kernel/params.c:812 [inline]
 param_sysfs_builtin kernel/params.c:851 [inline]
 param_sysfs_builtin_init+0x307/0x4c0 kernel/params.c:987
 do_one_initcall+0x123/0x6e0 init/main.c:1283
 do_initcall_level init/main.c:1345 [inline]
 do_initcalls init/main.c:1361 [inline]
 do_basic_setup init/main.c:1380 [inline]
 kernel_init_freeable+0x5c8/0x920 init/main.c:1593
 kernel_init+0x1c/0x2b0 init/main.c:1483
 ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888034ec1700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888034ec1780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888034ec1800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff888034ec1880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888034ec1900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================