comedi comedi2: c6xdigio: I/O port conflict (0x5,3) ================================================================== BUG: KASAN: slab-use-after-free in sysfs_remove_file_ns+0x63/0x70 fs/sysfs/file.c:522 Read of size 8 at addr ffff888057641c30 by task syz.3.7238/6392 CPU: 2 UID: 0 PID: 6392 Comm: syz.3.7238 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __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:522 sysfs_remove_file include/linux/sysfs.h:777 [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+0x12c/0xa50 drivers/comedi/drivers.c:207 comedi_device_detach+0x67/0xb0 drivers/comedi/drivers.c:215 comedi_device_attach+0x43d/0x900 drivers/comedi/drivers.c:1011 do_devconfig_ioctl+0x1b1/0x710 drivers/comedi/comedi_fops.c:872 comedi_unlocked_ioctl+0x165d/0x2f00 drivers/comedi/comedi_fops.c:2178 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl fs/ioctl.c:584 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f28dbd8eba9 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:00007f28dcb8c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f28dbfd5fa0 RCX: 00007f28dbd8eba9 RDX: 0000200000000080 RSI: 0000000040946400 RDI: 0000000000000003 RBP: 00007f28dbe11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f28dbfd6038 R14: 00007f28dbfd5fa0 R15: 00007fffb880a5e8 Allocated by task 4527: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:388 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:405 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] fuse_io_alloc+0x47/0x150 fs/fuse/file.c:669 fuse_direct_io+0x194d/0x24f0 fs/fuse/file.c:1671 fuse_direct_IO+0x624/0xf40 fs/fuse/file.c:2809 generic_file_direct_write+0x197/0x410 mm/filemap.c:4109 fuse_cache_write_iter fs/fuse/file.c:1447 [inline] fuse_file_write_iter+0x793/0x990 fs/fuse/file.c:1780 aio_write+0x3b6/0x910 fs/aio.c:1634 __io_submit_one fs/aio.c:2006 [inline] io_submit_one+0x1243/0x1df0 fs/aio.c:2053 __do_sys_io_submit fs/aio.c:2112 [inline] __se_sys_io_submit fs/aio.c:2082 [inline] __x64_sys_io_submit+0x1a9/0x350 fs/aio.c:2082 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 4527: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:243 [inline] __kasan_slab_free+0x60/0x70 mm/kasan/common.c:275 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2422 [inline] slab_free mm/slub.c:4695 [inline] kfree+0x2b4/0x4d0 mm/slub.c:4894 fuse_async_req_send+0x217/0x290 fs/fuse/file.c:737 fuse_send_write fs/fuse/file.c:1085 [inline] fuse_direct_io+0x1a3b/0x24f0 fs/fuse/file.c:1645 fuse_direct_IO+0x624/0xf40 fs/fuse/file.c:2809 generic_file_direct_write+0x197/0x410 mm/filemap.c:4109 fuse_cache_write_iter fs/fuse/file.c:1447 [inline] fuse_file_write_iter+0x793/0x990 fs/fuse/file.c:1780 aio_write+0x3b6/0x910 fs/aio.c:1634 __io_submit_one fs/aio.c:2006 [inline] io_submit_one+0x1243/0x1df0 fs/aio.c:2053 __do_sys_io_submit fs/aio.c:2112 [inline] __se_sys_io_submit fs/aio.c:2082 [inline] __x64_sys_io_submit+0x1a9/0x350 fs/aio.c:2082 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888057641c00 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 48 bytes inside of freed 256-byte region [ffff888057641c00, ffff888057641d00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888057641c00 pfn:0x57640 head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88801b842b40 ffffea00011d4190 ffffea0000d65490 raw: ffff888057641c00 000000000010000d 00000000f5000000 0000000000000000 head: 00fff00000000240 ffff88801b842b40 ffffea00011d4190 ffffea0000d65490 head: ffff888057641c00 000000000010000d 00000000f5000000 0000000000000000 head: 00fff00000000001 ffffea00015d9001 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 6339, tgid 6337 (syz.1.81), ts 60845663302, free_ts 59804391358 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851 prep_new_page mm/page_alloc.c:1859 [inline] get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:2492 [inline] allocate_slab mm/slub.c:2660 [inline] new_slab+0x247/0x330 mm/slub.c:2714 ___slab_alloc+0xcf2/0x1750 mm/slub.c:3901 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3992 __slab_alloc_node mm/slub.c:4067 [inline] slab_alloc_node mm/slub.c:4228 [inline] __do_kmalloc_node mm/slub.c:4375 [inline] __kmalloc_noprof+0x2f2/0x510 mm/slub.c:4388 kmalloc_noprof include/linux/slab.h:909 [inline] io_cache_alloc_new+0x45/0xf0 io_uring/alloc_cache.c:40 io_cache_alloc io_uring/alloc_cache.h:59 [inline] io_uring_alloc_async_data io_uring/io_uring.h:246 [inline] io_rw_alloc_async io_uring/rw.c:202 [inline] __io_prep_rw+0x21d/0x1090 io_uring/rw.c:261 io_prep_rw+0x24/0x220 io_uring/rw.c:320 io_prep_rwv io_uring/rw.c:342 [inline] io_prep_writev+0x23/0xa0 io_uring/rw.c:362 io_init_req io_uring/io_uring.c:2199 [inline] io_submit_sqe io_uring/io_uring.c:2246 [inline] io_submit_sqes+0x850/0x25c0 io_uring/io_uring.c:2398 __do_sys_io_uring_enter+0xd6a/0x1630 io_uring/io_uring.c:3465 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 6296 tgid 6293 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] __free_frozen_pages+0x7d5/0x10f0 mm/page_alloc.c:2895 discard_slab mm/slub.c:2758 [inline] __put_partials+0x165/0x1c0 mm/slub.c:3223 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_krealloc+0x14a/0x1a0 mm/kasan/common.c:454 kasan_krealloc include/linux/kasan.h:280 [inline] __do_krealloc mm/slub.c:4953 [inline] krealloc_noprof+0x19f/0x3a0 mm/slub.c:5010 push_jmp_history+0x2fa/0x790 kernel/bpf/verifier.c:3984 do_check kernel/bpf/verifier.c:20049 [inline] do_check_common+0xc52/0xb410 kernel/bpf/verifier.c:23264 do_check_main kernel/bpf/verifier.c:23347 [inline] bpf_check+0x869f/0xc670 kernel/bpf/verifier.c:24707 bpf_prog_load+0xe41/0x2490 kernel/bpf/syscall.c:2979 __sys_bpf+0x4a3f/0x4de0 kernel/bpf/syscall.c:6029 __do_sys_bpf kernel/bpf/syscall.c:6139 [inline] __se_sys_bpf kernel/bpf/syscall.c:6137 [inline] __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:6137 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888057641b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888057641b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888057641c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888057641c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888057641d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================