UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/09/12 12:00 (1000) UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/09/12 12:00 (1000) ================================================================== BUG: KASAN: slab-out-of-bounds in udf_write_aext+0x847/0x860 fs/udf/inode.c:2059 Write of size 4 at addr ffff88809d0ed338 by task syz-executor.5/18419 CPU: 0 PID: 18419 Comm: syz-executor.5 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_store_n_noabort+0x8b/0xa0 mm/kasan/report.c:449 udf_write_aext+0x847/0x860 fs/udf/inode.c:2059 udf_add_entry+0xdab/0x2a20 fs/udf/namei.c:496 udf_mkdir+0x145/0x650 fs/udf/namei.c:693 vfs_mkdir+0x508/0x7a0 fs/namei.c:3819 do_mkdirat+0x262/0x2d0 fs/namei.c:3842 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f6a98658639 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6a96bcb168 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f6a98778f80 RCX: 00007f6a98658639 RDX: 0000000000000100 RSI: 00000000200009c0 RDI: ffffffffffffff9c RBP: 00007f6a986b37e1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff62fc021f R14: 00007f6a96bcb300 R15: 0000000000022000 UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/09/12 12:00 (1000) Allocated by task 14466: kmem_cache_alloc_trace+0x12f/0x380 mm/slab.c:3625 kmalloc include/linux/slab.h:515 [inline] kzalloc include/linux/slab.h:709 [inline] kernfs_fop_open+0x2b3/0xd20 fs/kernfs/file.c:648 do_dentry_open+0x4aa/0x1160 fs/open.c:796 do_last fs/namei.c:3421 [inline] path_openat+0x793/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 14466: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x210 mm/slab.c:3822 kernfs_fop_release+0x120/0x190 fs/kernfs/file.c:783 __fput+0x2ce/0x890 fs/file_table.c:278 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 ffff88809d0ed0c0 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 120 bytes to the right of 512-byte region [ffff88809d0ed0c0, ffff88809d0ed2c0) The buggy address belongs to the page: page:ffffea0002743b40 count:1 mapcount:0 mapping:ffff88813bff0940 index:0xffff88809d0ed5c0 flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea0002d1b288 ffffea0002cb0088 ffff88813bff0940 raw: ffff88809d0ed5c0 ffff88809d0ed0c0 0000000100000005 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809d0ed200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809d0ed280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88809d0ed300: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ^ ffff88809d0ed380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88809d0ed400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================