EXT4-fs (loop4): 1 truncate cleaned up EXT4-fs (loop4): mounted filesystem 00000000-0000-0000-0000-000000000000 without journal. Quota mode: none. ================================================================== BUG: KASAN: slab-use-after-free in get_max_inline_xattr_value_size+0x369/0x510 fs/ext4/inline.c:62 Read of size 4 at addr ffff88801e2d708c by task syz-executor.4/11177 CPU: 1 PID: 11177 Comm: syz-executor.4 Not tainted 6.3.0-rc6-syzkaller-00188-g3e7bb4f24617 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:319 [inline] print_report+0x163/0x540 mm/kasan/report.c:430 kasan_report+0x176/0x1b0 mm/kasan/report.c:536 get_max_inline_xattr_value_size+0x369/0x510 fs/ext4/inline.c:62 ext4_update_inline_dir fs/ext4/inline.c:1109 [inline] ext4_try_add_inline_entry+0x34b/0xb70 fs/ext4/inline.c:1306 ext4_add_entry+0x535/0x1010 fs/ext4/namei.c:2384 ext4_mkdir+0x553/0xce0 fs/ext4/namei.c:3006 vfs_mkdir+0x29d/0x450 fs/namei.c:4038 do_mkdirat+0x264/0x520 fs/namei.c:4061 __do_sys_mkdir fs/namei.c:4081 [inline] __se_sys_mkdir fs/namei.c:4079 [inline] __x64_sys_mkdir+0x6e/0x80 fs/namei.c:4079 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f5ebca8c169 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:00007f5ebd8d7168 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007f5ebcbabf80 RCX: 00007f5ebca8c169 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200000c0 RBP: 00007f5ebcae7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff0019460f R14: 00007f5ebd8d7300 R15: 0000000000022000 Allocated by task 2: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x66/0x70 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook+0x68/0x3a0 mm/slab.h:769 slab_alloc_node mm/slub.c:3452 [inline] slab_alloc mm/slub.c:3460 [inline] __kmem_cache_alloc_lru mm/slub.c:3467 [inline] kmem_cache_alloc+0x11f/0x2e0 mm/slub.c:3476 prepare_creds+0x40/0x630 kernel/cred.c:260 copy_creds+0x14a/0xca0 kernel/cred.c:365 copy_process+0x94a/0x3fc0 kernel/fork.c:2127 kernel_clone+0x222/0x800 kernel/fork.c:2682 kernel_thread+0x156/0x1d0 kernel/fork.c:2742 create_kthread kernel/kthread.c:399 [inline] kthreadd+0x583/0x750 kernel/kthread.c:746 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Freed by task 15: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:521 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook mm/slub.c:1807 [inline] slab_free mm/slub.c:3787 [inline] kmem_cache_free+0x297/0x520 mm/slub.c:3809 rcu_do_batch kernel/rcu/tree.c:2112 [inline] rcu_core+0xa4d/0x16f0 kernel/rcu/tree.c:2372 __do_softirq+0x2ab/0x908 kernel/softirq.c:571 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:491 __call_rcu_common kernel/rcu/tree.c:2622 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:2736 put_cred include/linux/cred.h:288 [inline] exit_creds+0x20c/0x340 kernel/cred.c:178 __put_task_struct+0x108/0x290 kernel/fork.c:849 rcu_do_batch kernel/rcu/tree.c:2112 [inline] rcu_core+0xa4d/0x16f0 kernel/rcu/tree.c:2372 __do_softirq+0x2ab/0x908 kernel/softirq.c:571 Second to last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:491 __call_rcu_common kernel/rcu/tree.c:2622 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:2736 put_cred include/linux/cred.h:288 [inline] exit_creds+0x20c/0x340 kernel/cred.c:178 __put_task_struct+0x108/0x290 kernel/fork.c:849 rcu_do_batch kernel/rcu/tree.c:2112 [inline] rcu_core+0xa4d/0x16f0 kernel/rcu/tree.c:2372 __do_softirq+0x2ab/0x908 kernel/softirq.c:571 The buggy address belongs to the object at ffff88801e2d7000 which belongs to the cache cred_jar of size 192 The buggy address is located 140 bytes inside of freed 192-byte region [ffff88801e2d7000, ffff88801e2d70c0) The buggy address belongs to the physical page: page:ffffea000078b5c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1e2d7 memcg:ffff888021663f01 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffff8881400073c0 ffffea000079cc00 dead000000000004 raw: 0000000000000000 0000000000100010 00000001ffffffff ffff888021663f01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 819, tgid 819 (kworker/u4:5), ts 6611519993, free_ts 6611316771 prep_new_page mm/page_alloc.c:2553 [inline] get_page_from_freelist+0x3246/0x33c0 mm/page_alloc.c:4326 __alloc_pages+0x255/0x670 mm/page_alloc.c:5592 alloc_slab_page+0x6a/0x160 mm/slub.c:1851 allocate_slab mm/slub.c:1998 [inline] new_slab+0x84/0x2f0 mm/slub.c:2051 ___slab_alloc+0xa85/0x10a0 mm/slub.c:3193 __slab_alloc mm/slub.c:3292 [inline] __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] slab_alloc mm/slub.c:3460 [inline] __kmem_cache_alloc_lru mm/slub.c:3467 [inline] kmem_cache_alloc+0x1b9/0x2e0 mm/slub.c:3476 prepare_kernel_cred+0x34/0x6c0 kernel/cred.c:720 call_usermodehelper_exec_async+0xce/0x370 kernel/umh.c:89 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1454 [inline] free_pcp_prepare mm/page_alloc.c:1504 [inline] free_unref_page_prepare+0xe2f/0xe70 mm/page_alloc.c:3388 free_unref_page+0x37/0x3f0 mm/page_alloc.c:3483 mm_free_pgd kernel/fork.c:737 [inline] __mmdrop+0xbe/0x3d0 kernel/fork.c:790 free_bprm+0x144/0x320 fs/exec.c:1489 kernel_execve+0x8f5/0xa10 fs/exec.c:2022 call_usermodehelper_exec_async+0x233/0x370 kernel/umh.c:110 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Memory state around the buggy address: ffff88801e2d6f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88801e2d7000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801e2d7080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff88801e2d7100: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801e2d7180: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================