audit: type=1804 audit(1669904029.448:765): pid=2045 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir609634722/syzkaller.Uu3C23/7776/file0/bus" dev="loop3" ino=842 res=1 ================================================================== BUG: KASAN: slab-out-of-bounds in udf_get_fileident+0x233/0x250 fs/udf/directory.c:176 Read of size 2 at addr ffff88804d2222c0 by task syz-executor.3/2045 CPU: 1 PID: 2045 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load_n_noabort+0x8b/0xa0 mm/kasan/report.c:443 udf_get_fileident+0x233/0x250 fs/udf/directory.c:176 udf_fileident_read+0x550/0x1930 fs/udf/directory.c:37 udf_readdir+0x559/0x1350 fs/udf/dir.c:129 iterate_dir+0x473/0x5c0 fs/readdir.c:51 __do_sys_getdents fs/readdir.c:271 [inline] __se_sys_getdents+0x175/0x2d0 fs/readdir.c:252 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f4a352550d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4a337c7168 EFLAGS: 00000246 ORIG_RAX: 000000000000004e RAX: ffffffffffffffda RBX: 00007f4a35374f80 RCX: 00007f4a352550d9 audit: type=1800 audit(1669904029.488:766): pid=2045 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="loop3" ino=842 res=0 RDX: 000000000000009c RSI: 0000000020000280 RDI: 0000000000000008 RBP: 00007f4a352b0ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff2511695f R14: 00007f4a337c7300 R15: 0000000000022000 Allocated by task 2045: __do_kmalloc mm/slab.c:3727 [inline] __kmalloc+0x15a/0x3c0 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] udf_alloc_i_data+0x1f/0x70 fs/udf/inode.c:1601 udf_read_inode fs/udf/inode.c:1408 [inline] __udf_iget+0x24dd/0x31a0 fs/udf/inode.c:1872 udf_iget fs/udf/udfdecl.h:155 [inline] udf_lookup fs/udf/namei.c:334 [inline] udf_lookup+0x212/0x270 fs/udf/namei.c:296 __lookup_slow+0x246/0x4a0 fs/namei.c:1672 lookup_slow fs/namei.c:1689 [inline] walk_component+0x7ac/0xda0 fs/namei.c:1811 lookup_last fs/namei.c:2274 [inline] path_lookupat+0x1ff/0x8d0 fs/namei.c:2319 filename_lookup+0x1ac/0x5a0 fs/namei.c:2349 bpf_obj_do_get kernel/bpf/inode.c:459 [inline] bpf_obj_get_user+0xd9/0x3f0 kernel/bpf/inode.c:499 bpf_obj_get kernel/bpf/syscall.c:1511 [inline] __do_sys_bpf kernel/bpf/syscall.c:2429 [inline] __se_sys_bpf+0xb2a/0x3a20 kernel/bpf/syscall.c:2384 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8140: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x210 mm/slab.c:3822 free_fs_info fs/btrfs/ctree.h:2986 [inline] btrfs_kill_super+0x213/0x550 fs/btrfs/super.c:2222 deactivate_locked_super+0x94/0x160 fs/super.c:329 deactivate_super+0x174/0x1a0 fs/super.c:360 cleanup_mnt+0x1a8/0x290 fs/namespace.c:1098 task_work_run+0x148/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88804d222380 which belongs to the cache kmalloc-4096 of size 4096 The buggy address is located 192 bytes to the left of 4096-byte region [ffff88804d222380, ffff88804d223380) The buggy address belongs to the page: page:ffffea0001348880 count:1 mapcount:0 mapping:ffff88813bff0dc0 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffffea0001117288 ffffea0002c2fc88 ffff88813bff0dc0 raw: 0000000000000000 ffff88804d222380 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88804d222180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88804d222200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88804d222280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88804d222300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88804d222380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================