================================================================== BUG: KASAN: use-after-free in crc_itu_t+0x1f5/0x280 lib/crc-itu-t.c:60 Read of size 1 at addr ffff888073daf000 by task syz-executor.0/4465 CPU: 1 PID: 4465 Comm: syz-executor.0 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 crc_itu_t+0x1f5/0x280 lib/crc-itu-t.c:60 udf_finalize_lvid fs/udf/super.c:2048 [inline] udf_close_lvid+0x543/0x990 fs/udf/super.c:2116 udf_put_super+0xc8/0x160 fs/udf/super.c:2386 generic_shutdown_super+0x130/0x300 fs/super.c:475 kill_block_super+0x7c/0xe0 fs/super.c:1427 deactivate_locked_super+0x93/0xf0 fs/super.c:335 cleanup_mnt+0x418/0x4d0 fs/namespace.c:1139 task_work_run+0x125/0x1a0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fab4e4f9c87 Code: b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffebc9748b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007fab4e553c5a RCX: 00007fab4e4f9c87 RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffebc974970 RBP: 00007ffebc974970 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffebc975a30 R13: 00007fab4e553c5a R14: 0000000000014bf1 R15: 0000000000000006 Allocated by task 4607: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x9c/0xd0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0x100/0x290 mm/slub.c:3233 mempool_alloc+0x18f/0x4e0 mm/mempool.c:393 bio_alloc_bioset+0x124/0x870 block/bio.c:466 bio_alloc include/linux/bio.h:424 [inline] submit_bh_wbc+0x1c0/0x670 fs/buffer.c:3028 submit_bh fs/buffer.c:3062 [inline] __bread_slow fs/buffer.c:1180 [inline] __bread_gfp+0x1ae/0x380 fs/buffer.c:1384 sb_bread include/linux/buffer_head.h:337 [inline] udf_tread fs/udf/misc.c:-1 [inline] udf_read_tagged+0x113/0xdf0 fs/udf/misc.c:219 udf_process_sequence+0x1aa/0x45d0 fs/udf/super.c:1725 udf_load_sequence fs/udf/super.c:1838 [inline] udf_check_anchor_block+0x3f3/0x720 fs/udf/super.c:1878 udf_scan_anchors+0x142/0x5c0 fs/udf/super.c:1911 udf_find_anchor fs/udf/super.c:1968 [inline] udf_load_vrs+0x192/0xad0 fs/udf/super.c:2033 udf_fill_super+0x69f/0x18f0 fs/udf/super.c:2211 mount_bdev+0x287/0x3c0 fs/super.c:1400 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x24a/0xa40 fs/namespace.c:3014 do_mount fs/namespace.c:3357 [inline] __do_sys_mount fs/namespace.c:3565 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3542 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 14: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0xea/0x170 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kmem_cache_free+0x8f/0x210 mm/slub.c:3515 req_bio_endio block/blk-core.c:261 [inline] blk_update_request+0x876/0x1200 block/blk-core.c:1441 blk_mq_end_request+0x3a/0x70 block/blk-mq.c:575 blk_complete_reqs block/blk-mq.c:587 [inline] blk_done_softirq+0xfa/0x140 block/blk-mq.c:592 handle_softirqs+0x328/0x820 kernel/softirq.c:576 run_ksoftirqd+0x98/0xf0 kernel/softirq.c:943 smpboot_thread_fn+0x4f6/0x970 kernel/smpboot.c:164 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the object at ffff888073daf000 which belongs to the cache bio-200 of size 200 The buggy address is located 0 bytes inside of 200-byte region [ffff888073daf000, ffff888073daf0c8) The buggy address belongs to the page: page:ffffea0001cf6bc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x73daf flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 dead000000000122 ffff88801ba7b3c0 raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x192800(GFP_NOWAIT|__GFP_NOWARN|__GFP_NORETRY|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4607, ts 85127419302, free_ts 85092093699 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5474 alloc_slab_page mm/slub.c:1775 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1975 ___slab_alloc+0x81e/0xdf0 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0x195/0x290 mm/slub.c:3233 mempool_alloc+0x18f/0x4e0 mm/mempool.c:393 bio_alloc_bioset+0x124/0x870 block/bio.c:466 bio_alloc include/linux/bio.h:424 [inline] submit_bh_wbc+0x1c0/0x670 fs/buffer.c:3028 submit_bh fs/buffer.c:3062 [inline] __bread_slow fs/buffer.c:1180 [inline] __bread_gfp+0x1ae/0x380 fs/buffer.c:1384 sb_bread include/linux/buffer_head.h:337 [inline] udf_tread fs/udf/misc.c:-1 [inline] udf_read_tagged+0x113/0xdf0 fs/udf/misc.c:219 udf_process_sequence+0x1aa/0x45d0 fs/udf/super.c:1725 udf_load_sequence fs/udf/super.c:1838 [inline] udf_check_anchor_block+0x3f3/0x720 fs/udf/super.c:1878 udf_scan_anchors+0x142/0x5c0 fs/udf/super.c:1911 udf_find_anchor fs/udf/super.c:1968 [inline] udf_load_vrs+0x192/0xad0 fs/udf/super.c:2033 udf_fill_super+0x69f/0x18f0 fs/udf/super.c:2211 mount_bdev+0x287/0x3c0 fs/super.c:1400 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page+0x94/0x280 mm/page_alloc.c:3396 free_slab mm/slub.c:2015 [inline] discard_slab mm/slub.c:2021 [inline] __unfreeze_partials+0x1a5/0x200 mm/slub.c:2507 put_cpu_partial+0x12d/0x190 mm/slub.c:2587 qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0x100/0x290 mm/slub.c:3233 getname_flags+0xb5/0x500 fs/namei.c:138 do_sys_openat2+0xcf/0x4a0 fs/open.c:1247 do_sys_open fs/open.c:1269 [inline] __do_sys_openat fs/open.c:1285 [inline] __se_sys_openat fs/open.c:1280 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1280 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Memory state around the buggy address: ffff888073daef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888073daef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888073daf000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888073daf080: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc ffff888073daf100: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ==================================================================