================================================================== BUG: KASAN: slab-use-after-free in jfs_readdir+0x135b/0x4660 fs/jfs/jfs_dtree.c:2869 Read of size 8 at addr ffff88805b881ad8 by task syz.1.130/6405 CPU: 0 UID: 0 PID: 6405 Comm: syz.1.130 Not tainted 6.11.0-rc5-syzkaller-00050-g3ec3f5fc4a91 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 jfs_readdir+0x135b/0x4660 fs/jfs/jfs_dtree.c:2869 wrap_directory_iterator+0x94/0xe0 fs/readdir.c:65 iterate_dir+0x57a/0x810 fs/readdir.c:108 __do_sys_getdents fs/readdir.c:324 [inline] __se_sys_getdents+0x1ef/0x4d0 fs/readdir.c:309 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1085f79e79 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1086d05038 EFLAGS: 00000246 ORIG_RAX: 000000000000004e RAX: ffffffffffffffda RBX: 00007f1086115f80 RCX: 00007f1085f79e79 RDX: 0000000000000058 RSI: 0000000000000000 RDI: 0000000000000006 RBP: 00007f1085fe793e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f1086115f80 R15: 00007ffd89ced478 Allocated by task 6405: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3988 [inline] slab_alloc_node mm/slub.c:4037 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4044 mempool_alloc_noprof+0x197/0x5a0 mm/mempool.c:402 alloc_metapage fs/jfs/jfs_metapage.c:182 [inline] __get_metapage+0x4ed/0xef0 fs/jfs/jfs_metapage.c:652 dtSplitRoot+0x2af/0x1930 fs/jfs/jfs_dtree.c:1909 dtSplitUp fs/jfs/jfs_dtree.c:992 [inline] dtInsert+0x12cd/0x6c10 fs/jfs/jfs_dtree.c:870 jfs_create+0x7ba/0xbb0 fs/jfs/namei.c:137 lookup_open fs/namei.c:3578 [inline] open_last_lookups fs/namei.c:3647 [inline] path_openat+0x1a9a/0x3470 fs/namei.c:3883 do_filp_open+0x235/0x490 fs/namei.c:3913 do_sys_openat2+0x13e/0x1d0 fs/open.c:1416 do_sys_open fs/open.c:1431 [inline] __do_sys_openat fs/open.c:1447 [inline] __se_sys_openat fs/open.c:1442 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1442 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6405: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2252 [inline] slab_free mm/slub.c:4473 [inline] kmem_cache_free+0x145/0x350 mm/slub.c:4548 free_metapage fs/jfs/jfs_metapage.c:197 [inline] drop_metapage fs/jfs/jfs_metapage.c:234 [inline] release_metapage+0x725/0x960 fs/jfs/jfs_metapage.c:784 dtReadNext fs/jfs/jfs_dtree.c:3174 [inline] jfs_readdir+0x1025/0x4660 fs/jfs/jfs_dtree.c:2862 wrap_directory_iterator+0x94/0xe0 fs/readdir.c:65 iterate_dir+0x57a/0x810 fs/readdir.c:108 __do_sys_getdents fs/readdir.c:324 [inline] __se_sys_getdents+0x1ef/0x4d0 fs/readdir.c:309 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88805b881aa8 which belongs to the cache jfs_mp of size 184 The buggy address is located 48 bytes inside of freed 184-byte region [ffff88805b881aa8, ffff88805b881b60) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5b881 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000000 ffff888018bcfa00 ffffea00007ca6c0 0000000000000002 raw: 0000000000000000 0000000080100010 00000001fdffffff 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 0x1d2800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5449, tgid 5448 (syz.2.32), ts 88770184339, free_ts 88210694604 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3439 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4695 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2321 allocate_slab+0x5a/0x2f0 mm/slub.c:2484 new_slab mm/slub.c:2537 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3723 __slab_alloc+0x58/0xa0 mm/slub.c:3813 __slab_alloc_node mm/slub.c:3866 [inline] slab_alloc_node mm/slub.c:4025 [inline] kmem_cache_alloc_noprof+0x1c1/0x2a0 mm/slub.c:4044 mempool_alloc_noprof+0x197/0x5a0 mm/mempool.c:402 alloc_metapage fs/jfs/jfs_metapage.c:182 [inline] __get_metapage+0x4ed/0xef0 fs/jfs/jfs_metapage.c:652 diMount+0xd6/0x870 fs/jfs/jfs_imap.c:111 jfs_mount+0xe0/0x830 fs/jfs/jfs_mount.c:100 jfs_fill_super+0x59c/0xc50 fs/jfs/super.c:556 mount_bdev+0x20a/0x2d0 fs/super.c:1679 legacy_get_tree+0xee/0x190 fs/fs_context.c:662 vfs_get_tree+0x90/0x2b0 fs/super.c:1800 page last free pid 5208 tgid 5208 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1094 [inline] free_unref_page+0xd19/0xea0 mm/page_alloc.c:2612 vfree+0x186/0x2e0 mm/vmalloc.c:3364 kcov_put kernel/kcov.c:438 [inline] kcov_close+0x2b/0x50 kernel/kcov.c:534 __fput+0x24a/0x8a0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:228 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xa2f/0x27f0 kernel/exit.c:882 do_group_exit+0x207/0x2c0 kernel/exit.c:1031 __do_sys_exit_group kernel/exit.c:1042 [inline] __se_sys_exit_group kernel/exit.c:1040 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88805b881980: fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb ffff88805b881a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc >ffff88805b881a80: fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb ^ ffff88805b881b00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88805b881b80: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb ==================================================================