UDF-fs: warning (device loop0): udf_load_vrs: No VRS found UDF-fs: Scanning with blocksize 2048 failed UDF-fs: error (device loop0): udf_read_tagged: read failed, block=256, location=256 UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) ================================================================== BUG: KASAN: slab-out-of-bounds in udf_write_aext+0x6e3/0x7d0 fs/udf/inode.c:2076 Write of size 4 at addr ffff8880ac11e230 by task syz-executor117/7974 CPU: 0 PID: 7974 Comm: syz-executor117 Not tainted 4.14.302-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_store_n_noabort+0x6b/0x80 mm/kasan/report.c:446 udf_write_aext+0x6e3/0x7d0 fs/udf/inode.c:2076 udf_add_entry+0xc54/0x2710 fs/udf/namei.c:501 udf_mkdir+0x122/0x620 fs/udf/namei.c:699 vfs_mkdir+0x463/0x6e0 fs/namei.c:3851 SYSC_mkdirat fs/namei.c:3874 [inline] SyS_mkdirat+0x1fd/0x270 fs/namei.c:3858 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 RIP: 0033:0x7ffba87b5e67 RSP: 002b:00007ffec0441a18 EFLAGS: 00000286 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00005555570e22c0 RCX: 00007ffba87b5e67 RDX: 0000000000000000 RSI: 00000000000001ff RDI: 0000000020000040 RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000286 R12: 0000000020000040 R13: 00000000200002c0 R14: 0000000000000000 R15: 00007ffec0441ab0 Allocated by task 7974: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 __do_kmalloc mm/slab.c:3720 [inline] __kmalloc+0x15a/0x400 mm/slab.c:3729 kmalloc include/linux/slab.h:493 [inline] kzalloc include/linux/slab.h:661 [inline] udf_new_inode+0x1f6/0xce0 fs/udf/ialloc.c:75 udf_mkdir+0x95/0x620 fs/udf/namei.c:692 vfs_mkdir+0x463/0x6e0 fs/namei.c:3851 SYSC_mkdirat fs/namei.c:3874 [inline] SyS_mkdirat+0x1fd/0x270 fs/namei.c:3858 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 Freed by task 6330: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xc9/0x250 mm/slab.c:3815 kvfree+0x45/0x50 mm/util.c:449 seq_release+0x4f/0x70 fs/seq_file.c:371 kernfs_fop_release+0xdc/0x180 fs/kernfs/file.c:781 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 The buggy address belongs to the object at ffff8880ac11e240 which belongs to the cache kmalloc-4096 of size 4096 The buggy address is located 16 bytes to the left of 4096-byte region [ffff8880ac11e240, ffff8880ac11f240) The buggy address belongs to the page: page:ffffea0002b04780 count:1 mapcount:0 mapping:ffff8880ac11e240 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffff8880ac11e240 0000000000000000 0000000100000001 raw: ffffea000256ab20 ffffea0002cb27a0 ffff88813fe74dc0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880ac11e100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880ac11e180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880ac11e200: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ^ ffff8880ac11e280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880ac11e300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================