RAX: ffffffffffffffda RBX: 00007fe69da25fa0 RCX: 00007fe69d79e159 RDX: 00000000000001ff RSI: 0000200000000000 RDI: ffffffffffffff9c RBP: 00007fe69d83506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe69da26038 R14: 00007fe69da25fa0 R15: 00007ffd917026f8 ================================================================== BUG: KASAN: slab-use-after-free in jffs2_xattr_delete_inode+0x2c8/0x2d0 fs/jffs2/xattr.c:602 Read of size 4 at addr ffff88807c838f68 by task syz.3.454/7023 CPU: 1 UID: 0 PID: 7023 Comm: syz.3.454 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 jffs2_xattr_delete_inode+0x2c8/0x2d0 fs/jffs2/xattr.c:602 jffs2_do_clear_inode+0x58/0x390 fs/jffs2/readinode.c:1418 evict+0x624/0xb50 fs/inode.c:823 jffs2_new_inode+0x48a/0xd20 fs/jffs2/fs.c:-1 jffs2_mkdir+0x189/0xec0 fs/jffs2/dir.c:483 vfs_mkdir+0x40e/0x630 fs/namei.c:5423 filename_mkdirat+0x285/0x510 fs/namei.c:5456 __do_sys_mkdirat fs/namei.c:5477 [inline] __se_sys_mkdirat+0x35/0x150 fs/namei.c:5474 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe69d79e159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe69e71f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007fe69da25fa0 RCX: 00007fe69d79e159 RDX: 00000000000001ff RSI: 0000200000000000 RDI: ffffffffffffff9c RBP: 00007fe69d83506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe69da26038 R14: 00007fe69da25fa0 R15: 00007ffd917026f8 Allocated by task 6948: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:351 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:377 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4720 [inline] slab_alloc_node mm/slub.c:5033 [inline] kmem_cache_alloc_noprof+0x2b4/0x600 mm/slub.c:5047 jffs2_scan_make_ino_cache+0x89/0x1d0 fs/jffs2/scan.c:978 jffs2_scan_inode_node fs/jffs2/scan.c:1025 [inline] jffs2_scan_eraseblock fs/jffs2/scan.c:814 [inline] jffs2_scan_medium+0x35ac/0x7240 fs/jffs2/scan.c:151 jffs2_build_filesystem fs/jffs2/build.c:112 [inline] jffs2_do_mount_fs+0x775/0x22b0 fs/jffs2/build.c:416 jffs2_do_fill_super+0x555/0xc50 fs/jffs2/fs.c:574 mtd_get_sb+0x192/0x420 drivers/mtd/mtdsuper.c:59 get_tree_mtd+0x597/0x7d0 drivers/mtd/mtdsuper.c:143 vfs_get_tree+0x92/0x2a0 fs/super.c:1943 fc_mount fs/namespace.c:1209 [inline] do_new_mount_fc fs/namespace.c:3785 [inline] do_new_mount+0x319/0xdc0 fs/namespace.c:3861 do_mount fs/namespace.c:4194 [inline] __do_sys_mount fs/namespace.c:4407 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4384 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5614: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:264 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:296 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2780 [inline] slab_free mm/slub.c:6630 [inline] kmem_cache_free+0x182/0x650 mm/slub.c:6757 jffs2_free_ino_caches+0xec/0x1c0 fs/jffs2/nodelist.c:497 jffs2_put_super+0x6c/0x170 fs/jffs2/super.c:335 generic_shutdown_super+0x13d/0x2d0 fs/super.c:751 kill_mtd_super+0x23/0x70 drivers/mtd/mtdsuper.c:176 jffs2_kill_sb+0x96/0xb0 fs/jffs2/super.c:350 deactivate_locked_super+0xbe/0x110 fs/super.c:586 cleanup_mnt+0x3d3/0x460 fs/namespace.c:1329 task_work_run+0x1d9/0x260 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:70 [inline] exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline] do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88807c838f40 which belongs to the cache jffs2_inode_cache of size 48 The buggy address is located 40 bytes inside of freed 48-byte region [ffff88807c838f40, ffff88807c838f70) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88807c838b80 pfn:0x7c838 flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000200 ffff8881404e2b40 ffffea0001d84a10 ffff88801e791648 raw: ffff88807c838b80 0000000200400022 00000000f5000000 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 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5771, tgid 5770 (syz.1.8), ts 88831326196 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1854 prep_new_page mm/page_alloc.c:1862 [inline] get_page_from_freelist+0x220f/0x2280 mm/page_alloc.c:3933 __alloc_frozen_pages_noprof+0x1fc/0x400 mm/page_alloc.c:5441 alloc_slab_page mm/slub.c:3384 [inline] allocate_slab+0x7d/0x5e0 mm/slub.c:3499 new_slab mm/slub.c:3550 [inline] refill_objects+0x2d5/0x350 mm/slub.c:7539 refill_sheaf mm/slub.c:2917 [inline] __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4811 alloc_from_pcs mm/slub.c:4887 [inline] slab_alloc_node mm/slub.c:5021 [inline] kmem_cache_alloc_noprof+0x394/0x600 mm/slub.c:5047 jffs2_do_read_inode+0x33f/0x6a0 fs/jffs2/readinode.c:1372 jffs2_iget+0x228/0xcc0 fs/jffs2/fs.c:277 jffs2_do_fill_super+0x59d/0xc50 fs/jffs2/fs.c:578 mtd_get_sb+0x192/0x420 drivers/mtd/mtdsuper.c:59 get_tree_mtd+0x597/0x7d0 drivers/mtd/mtdsuper.c:143 vfs_get_tree+0x92/0x2a0 fs/super.c:1943 fc_mount fs/namespace.c:1209 [inline] do_new_mount_fc fs/namespace.c:3785 [inline] do_new_mount+0x319/0xdc0 fs/namespace.c:3861 do_mount fs/namespace.c:4194 [inline] __do_sys_mount fs/namespace.c:4407 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4384 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 page last free pid 5616 tgid 5616 ts 88796791037 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1401 [inline] __free_frozen_pages+0xc97/0xd90 mm/page_alloc.c:2952 __tlb_remove_table_free mm/mmu_gather.c:226 [inline] tlb_remove_table_rcu+0x85/0x100 mm/mmu_gather.c:287 rcu_do_batch kernel/rcu/tree.c:2650 [inline] rcu_core+0x926/0x1260 kernel/rcu/tree.c:2919 handle_softirqs+0x223/0x840 kernel/softirq.c:645 __do_softirq kernel/softirq.c:679 [inline] invoke_softirq kernel/softirq.c:519 [inline] __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758 irq_exit_rcu+0x9/0x30 kernel/softirq.c:775 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 Memory state around the buggy address: ffff88807c838e00: fa fb fb fb fb fb fc fc fa fb fb fb fb fb fc fc ffff88807c838e80: fa fb fb fb fb fb fc fc fa fb fb fb fb fb fc fc >ffff88807c838f00: fa fb fb fb fb fb fc fc fa fb fb fb fb fb fc fc ^ ffff88807c838f80: fa fb fb fb fb fb fc fc fa fb fb fb fb fb fc fc ffff88807c839000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================