================================================================== BUG: KASAN: slab-use-after-free in jffs2_xattr_delete_inode+0x2c8/0x2d0 fs/jffs2/xattr.c:602 Read of size 4 at addr ffff88805b070b28 by task syz.7.4957/19270 CPU: 0 UID: 0 PID: 19270 Comm: syz.7.4957 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026 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:822 jffs2_new_inode+0x48a/0xd20 fs/jffs2/fs.c:-1 jffs2_create+0x87/0x320 fs/jffs2/dir.c:182 lookup_open+0x102d/0x1ae0 fs/namei.c:4575 open_last_lookups fs/namei.c:4774 [inline] path_openat+0x70c/0x20f0 fs/namei.c:5013 do_file_open+0x23e/0x4a0 fs/namei.c:5045 do_sys_openat2+0x115/0x200 fs/open.c:1442 do_sys_open fs/open.c:1448 [inline] __do_sys_open fs/open.c:1780 [inline] __se_sys_open fs/open.c:1776 [inline] __x64_sys_open+0x11e/0x150 fs/open.c:1776 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x00007f7a5399fb19 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:00007f7a5488f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007f7a53c25fa0 RCX: 00007f7a5399fb19 RDX: 00000000000001c0 RSI: 00000000000a23c6 RDI: 0000200000000000 RBP: 00007f7a53a37b70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7a53c26038 R14: 00007f7a53c25fa0 R15: 00007ffcb0ab9f88 Allocated by task 10354: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3f/0x90 mm/kasan/common.c:79 unpoison_slab_object mm/kasan/common.c:354 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:380 kasan_slab_alloc include/linux/kasan.h:257 [inline] slab_post_alloc_hook mm/slub.c:4716 [inline] slab_alloc_node mm/slub.c:5029 [inline] kmem_cache_alloc_noprof+0x2b4/0x600 mm/slub.c:5043 jffs2_scan_make_ino_cache+0x89/0x1d0 fs/jffs2/scan.c:978 jffs2_sum_process_sum_data fs/jffs2/summary.c:467 [inline] jffs2_sum_scan_sumnode+0x7ac/0x2870 fs/jffs2/summary.c:640 jffs2_scan_eraseblock fs/jffs2/scan.c:546 [inline] jffs2_scan_medium+0x882/0x7240 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+0x555/0xc60 fs/jffs2/fs.c:574 mtd_get_sb+0x195/0x420 drivers/mtd/mtdsuper.c:59 get_tree_mtd+0x597/0x7d0 drivers/mtd/mtdsuper.c:143 vfs_get_tree+0x92/0x2a0 fs/super.c:1881 fc_mount fs/namespace.c:1282 [inline] do_new_mount_fc fs/namespace.c:3910 [inline] do_new_mount+0x325/0xb00 fs/namespace.c:3986 do_mount fs/namespace.c:4350 [inline] __do_sys_mount fs/namespace.c:4565 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4542 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5649: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3f/0x90 mm/kasan/common.c:79 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:599 poison_slab_object mm/kasan/common.c:267 [inline] __kasan_slab_free+0x70/0x90 mm/kasan/common.c:299 kasan_slab_free include/linux/kasan.h:239 [inline] slab_free_hook mm/slub.c:2778 [inline] slab_free mm/slub.c:6613 [inline] kmem_cache_free+0x184/0x660 mm/slub.c:6740 jffs2_free_ino_caches+0xec/0x1c0 fs/jffs2/nodelist.c:497 jffs2_put_super+0x6c/0x170 fs/jffs2/super.c:335 generic_shutdown_super+0x140/0x2d0 fs/super.c:723 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:558 cleanup_mnt+0x204/0x2a0 fs/namespace.c:1396 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+0x32c/0x530 arch/x86/entry/syscall_64.c:107 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88805b070b00 which belongs to the cache jffs2_inode_cache of size 48 The buggy address is located 40 bytes inside of freed 48-byte region [ffff88805b070b00, ffff88805b070b30) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88805b070f40 pfn:0x5b070 flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000200 ffff88801ff1dc80 ffffea0001db6190 ffff88802034c048 raw: ffff88805b070f40 0000000200400002 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 6162, tgid 6160 (syz.2.115), ts 112286213036 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1874 prep_new_page+0x22/0xb0 mm/page_alloc.c:1882 get_page_from_freelist+0x22a1/0x22e0 mm/page_alloc.c:3964 __alloc_frozen_pages_noprof+0x211/0x450 mm/page_alloc.c:5506 alloc_slab_page mm/slub.c:3382 [inline] allocate_slab+0x7d/0x5e0 mm/slub.c:3497 new_slab mm/slub.c:3548 [inline] refill_objects+0x2d5/0x350 mm/slub.c:7522 refill_sheaf mm/slub.c:2915 [inline] __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4807 alloc_from_pcs mm/slub.c:4883 [inline] slab_alloc_node mm/slub.c:5017 [inline] kmem_cache_alloc_noprof+0x394/0x600 mm/slub.c:5043 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/0xc60 fs/jffs2/fs.c:578 mtd_get_sb+0x195/0x420 drivers/mtd/mtdsuper.c:59 get_tree_mtd+0x597/0x7d0 drivers/mtd/mtdsuper.c:143 vfs_get_tree+0x92/0x2a0 fs/super.c:1881 fc_mount fs/namespace.c:1282 [inline] do_new_mount_fc fs/namespace.c:3910 [inline] do_new_mount+0x325/0xb00 fs/namespace.c:3986 do_mount fs/namespace.c:4350 [inline] __do_sys_mount fs/namespace.c:4565 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4542 page last free pid 5645 tgid 5645 ts 111493614736 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1416 [inline] __free_frozen_pages+0xd1a/0xe10 mm/page_alloc.c:2972 __slab_free+0x269/0x2c0 mm/slub.c:5922 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:364 kasan_slab_alloc include/linux/kasan.h:257 [inline] slab_post_alloc_hook mm/slub.c:4716 [inline] slab_alloc_node mm/slub.c:5029 [inline] kmem_cache_alloc_noprof+0x2b4/0x600 mm/slub.c:5043 alloc_filename fs/namei.c:147 [inline] do_getname+0x2e/0x250 fs/namei.c:187 class_filename_flags_constructor include/linux/fs.h:2595 [inline] do_sys_openat2+0xce/0x200 fs/open.c:1441 do_sys_open fs/open.c:1448 [inline] __do_sys_openat fs/open.c:1788 [inline] __se_sys_openat fs/open.c:1783 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1783 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88805b070a00: fa fb fb fb fb fb fc fc fa fb fb fb fb fb fc fc ffff88805b070a80: fa fb fb fb fb fb fc fc fa fb fb fb fb fb fc fc >ffff88805b070b00: fa fb fb fb fb fb fc fc fa fb fb fb fb fb fc fc ^ ffff88805b070b80: fa fb fb fb fb fb fc fc fa fb fb fb fb fb fc fc ffff88805b070c00: fa fb fb fb fb fb fc fc fa fb fb fb fb fb fc fc ==================================================================