================================================================== BUG: KASAN: slab-use-after-free in jfs_readdir+0x1358/0x4660 fs/jfs/jfs_dtree.c:2869 Read of size 8 at addr ffff888024eea410 by task syz.2.16/5456 CPU: 1 UID: 0 PID: 5456 Comm: syz.2.16 Not tainted 6.12.0-rc1-syzkaller-00042-gf23aa4c0761a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 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+0x1358/0x4660 fs/jfs/jfs_dtree.c:2869 wrap_directory_iterator+0x91/0xd0 fs/readdir.c:65 iterate_dir+0x571/0x800 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: 0033:0x7fd7e617dff9 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:00007fd7e6f8a038 EFLAGS: 00000246 ORIG_RAX: 000000000000004e RAX: ffffffffffffffda RBX: 00007fd7e6336130 RCX: 00007fd7e617dff9 RDX: 0000000000000058 RSI: 0000000000000000 RDI: 0000000000000007 RBP: 00007fd7e61f0296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fd7e6336130 R15: 00007fff96b7acf8 Allocated by task 5454: 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:319 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:247 [inline] slab_post_alloc_hook mm/slub.c:4086 [inline] slab_alloc_node mm/slub.c:4135 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4142 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_rename+0xafe/0x1bf0 fs/jfs/namei.c:1225 vfs_rename+0xbdb/0xf00 fs/namei.c:5013 do_renameat2+0xd94/0x13f0 fs/namei.c:5170 __do_sys_rename fs/namei.c:5217 [inline] __se_sys_rename fs/namei.c:5215 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:5215 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 5456: 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 mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2343 [inline] slab_free mm/slub.c:4580 [inline] kmem_cache_free+0x1a2/0x420 mm/slub.c:4682 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+0x1022/0x4660 fs/jfs/jfs_dtree.c:2862 wrap_directory_iterator+0x91/0xd0 fs/readdir.c:65 iterate_dir+0x571/0x800 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 ffff888024eea3e0 which belongs to the cache jfs_mp of size 184 The buggy address is located 48 bytes inside of freed 184-byte region [ffff888024eea3e0, ffff888024eea498) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x24eea flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff8881476b6b40 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080100010 00000001f5000000 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 0xd2800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5445, tgid 5443 (syz.2.16), ts 78765644043, free_ts 78736375942 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1545 [inline] get_page_from_freelist+0x3039/0x3180 mm/page_alloc.c:3457 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4733 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 alloc_slab_page+0x6a/0x120 mm/slub.c:2413 allocate_slab+0x5a/0x2f0 mm/slub.c:2579 new_slab mm/slub.c:2632 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3819 __slab_alloc+0x58/0xa0 mm/slub.c:3909 __slab_alloc_node mm/slub.c:3962 [inline] slab_alloc_node mm/slub.c:4123 [inline] kmem_cache_alloc_noprof+0x1c1/0x2a0 mm/slub.c:4142 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 diReadSpecial+0x25d/0x680 fs/jfs/jfs_imap.c:447 jfs_mount+0x28b/0x830 fs/jfs/jfs_mount.c:138 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 page last free pid 4674 tgid 4674 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_page+0xcd0/0xf00 mm/page_alloc.c:2638 discard_slab mm/slub.c:2678 [inline] __put_partials+0xeb/0x130 mm/slub.c:3146 put_cpu_partial+0x17c/0x250 mm/slub.c:3221 __slab_free+0x2ea/0x3d0 mm/slub.c:4450 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:247 [inline] slab_post_alloc_hook mm/slub.c:4086 [inline] slab_alloc_node mm/slub.c:4135 [inline] __do_kmalloc_node mm/slub.c:4264 [inline] __kmalloc_noprof+0x1a6/0x400 mm/slub.c:4277 kmalloc_noprof include/linux/slab.h:882 [inline] tomoyo_realpath_from_path+0xcf/0x5e0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x2b7/0x740 security/tomoyo/file.c:822 security_inode_getattr+0x130/0x330 security/security.c:2371 vfs_getattr+0x45/0x430 fs/stat.c:204 vfs_fstat fs/stat.c:229 [inline] vfs_fstatat+0xe4/0x190 fs/stat.c:338 __do_sys_newfstatat fs/stat.c:505 [inline] __se_sys_newfstatat fs/stat.c:499 [inline] __x64_sys_newfstatat+0x11d/0x1a0 fs/stat.c:499 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: ffff888024eea300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888024eea380: fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb fb >ffff888024eea400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888024eea480: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888024eea500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================