================================================================== BUG: KASAN: slab-use-after-free in jfs_readdir+0x135b/0x4660 fs/jfs/jfs_dtree.c:2867 Read of size 8 at addr ffff88804ed1a508 by task syz-executor.1/11956 CPU: 0 PID: 11956 Comm: syz-executor.1 Not tainted 6.9.0-rc5-syzkaller-00329-g5d12ed4bea43 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 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:2867 wrap_directory_iterator+0x94/0xe0 fs/readdir.c:67 iterate_dir+0x539/0x6f0 fs/readdir.c:110 __do_sys_getdents fs/readdir.c:326 [inline] __se_sys_getdents+0x1ef/0x4d0 fs/readdir.c:311 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4e5967dea9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4e5a3560c8 EFLAGS: 00000246 ORIG_RAX: 000000000000004e RAX: ffffffffffffffda RBX: 00007f4e597abf80 RCX: 00007f4e5967dea9 RDX: 0000000000000058 RSI: ffffffff81000000 RDI: 0000000000000006 RBP: 00007f4e596ca4a4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f4e597abf80 R15: 00007ffc78273a78 Allocated by task 11956: 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:3798 [inline] slab_alloc_node mm/slub.c:3845 [inline] kmem_cache_alloc+0x174/0x340 mm/slub.c:3852 mempool_alloc+0x197/0x5a0 mm/mempool.c:408 alloc_metapage fs/jfs/jfs_metapage.c:176 [inline] __get_metapage+0x593/0x1050 fs/jfs/jfs_metapage.c:651 dtSplitRoot+0x2af/0x1930 fs/jfs/jfs_dtree.c:1907 dtSplitUp fs/jfs/jfs_dtree.c:990 [inline] dtInsert+0x12fa/0x6b00 fs/jfs/jfs_dtree.c:868 jfs_create+0x7ba/0xb90 fs/jfs/namei.c:137 lookup_open fs/namei.c:3497 [inline] open_last_lookups fs/namei.c:3566 [inline] path_openat+0x1425/0x3240 fs/namei.c:3796 do_filp_open+0x235/0x490 fs/namei.c:3826 do_sys_openat2+0x13e/0x1d0 fs/open.c:1406 do_sys_open fs/open.c:1421 [inline] __do_sys_openat fs/open.c:1437 [inline] __se_sys_openat fs/open.c:1432 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1432 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 11956: 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+0xa6/0xe0 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:2106 [inline] slab_free mm/slub.c:4280 [inline] kmem_cache_free+0x10b/0x2c0 mm/slub.c:4344 free_metapage fs/jfs/jfs_metapage.c:191 [inline] drop_metapage fs/jfs/jfs_metapage.c:228 [inline] release_metapage+0x6e4/0x870 fs/jfs/jfs_metapage.c:786 dtReadNext fs/jfs/jfs_dtree.c:3172 [inline] jfs_readdir+0x1025/0x4660 fs/jfs/jfs_dtree.c:2860 wrap_directory_iterator+0x94/0xe0 fs/readdir.c:67 iterate_dir+0x539/0x6f0 fs/readdir.c:110 __do_sys_getdents fs/readdir.c:326 [inline] __se_sys_getdents+0x1ef/0x4d0 fs/readdir.c:311 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88804ed1a4d8 which belongs to the cache jfs_mp of size 184 The buggy address is located 48 bytes inside of freed 184-byte region [ffff88804ed1a4d8, ffff88804ed1a590) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4ed1a anon flags: 0xfff80000000800(slab|node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffffff() raw: 00fff80000000800 ffff8880197c9dc0 0000000000000000 0000000000000001 raw: 0000000000000000 0000000080100010 00000001ffffffff 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 0x192800(GFP_NOWAIT|__GFP_NORETRY|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5829, tgid -525762791 (syz-executor.3), ts 5829, free_ts 149757589291 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0x3410/0x35b0 mm/page_alloc.c:3317 __alloc_pages+0x256/0x6c0 mm/page_alloc.c:4575 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2175 allocate_slab mm/slub.c:2338 [inline] new_slab+0x84/0x2f0 mm/slub.c:2391 ___slab_alloc+0xc73/0x1260 mm/slub.c:3525 __slab_alloc mm/slub.c:3610 [inline] __slab_alloc_node mm/slub.c:3663 [inline] slab_alloc_node mm/slub.c:3835 [inline] kmem_cache_alloc+0x252/0x340 mm/slub.c:3852 mempool_alloc+0x197/0x5a0 mm/mempool.c:408 alloc_metapage fs/jfs/jfs_metapage.c:176 [inline] __get_metapage+0x593/0x1050 fs/jfs/jfs_metapage.c:651 diWriteSpecial+0x1a5/0x440 fs/jfs/jfs_imap.c:515 diSync+0x4ba/0x6e0 fs/jfs/jfs_imap.c:251 diUnmount+0xc7/0x130 fs/jfs/jfs_imap.c:185 jfs_umount+0x186/0x3a0 fs/jfs/jfs_umount.c:63 jfs_put_super+0x8a/0x190 fs/jfs/super.c:194 generic_shutdown_super+0x136/0x2d0 fs/super.c:641 kill_block_super+0x44/0x90 fs/super.c:1675 page last free pid 5201 tgid 5201 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1141 [inline] free_unref_page_prepare+0x97b/0xaa0 mm/page_alloc.c:2347 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2487 __slab_free+0x31b/0x3d0 mm/slub.c:4192 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x5e/0xc0 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3798 [inline] slab_alloc_node mm/slub.c:3845 [inline] kmem_cache_alloc+0x174/0x340 mm/slub.c:3852 getname_flags+0xbd/0x4f0 fs/namei.c:139 user_path_at_empty+0x2c/0x60 fs/namei.c:2920 user_path_at include/linux/namei.h:57 [inline] do_utimes_path fs/utimes.c:95 [inline] do_utimes+0x115/0x280 fs/utimes.c:145 __do_sys_utimensat fs/utimes.c:164 [inline] __se_sys_utimensat fs/utimes.c:148 [inline] __x64_sys_utimensat+0x14f/0x250 fs/utimes.c:148 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88804ed1a400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804ed1a480: fb fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb >ffff88804ed1a500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88804ed1a580: fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb ffff88804ed1a600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================