================================================================== BUG: KASAN: slab-use-after-free in ciCompare fs/jfs/jfs_dtree.c:3398 [inline] BUG: KASAN: slab-use-after-free in dtSearch+0x210d/0x2430 fs/jfs/jfs_dtree.c:644 Read of size 1 at addr ffff888067462154 by task syz-executor.0/7563 CPU: 0 PID: 7563 Comm: syz-executor.0 Not tainted 6.9.0-rc5-syzkaller-00042-ge88c4cfcb7b8 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 ciCompare fs/jfs/jfs_dtree.c:3398 [inline] dtSearch+0x210d/0x2430 fs/jfs/jfs_dtree.c:644 jfs_lookup+0x1a5/0x370 fs/jfs/namei.c:1461 lookup_open.isra.0+0x928/0x13c0 fs/namei.c:3475 open_last_lookups fs/namei.c:3566 [inline] path_openat+0x92f/0x2990 fs/namei.c:3796 do_filp_open+0x1dc/0x430 fs/namei.c:3826 do_sys_openat2+0x17a/0x1e0 fs/open.c:1406 do_sys_open fs/open.c:1421 [inline] __do_compat_sys_openat fs/open.c:1481 [inline] __se_compat_sys_openat fs/open.c:1479 [inline] __ia32_compat_sys_openat+0x16e/0x210 fs/open.c:1479 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x75/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf725c579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f5e4e5ac EFLAGS: 00000292 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00000000ffffff9c RCX: 0000000020000000 RDX: 000000000000275a RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 7541: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x89/0x90 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_lru+0x140/0x6f0 mm/slub.c:3864 alloc_inode_sb include/linux/fs.h:3091 [inline] jfs_alloc_inode+0x25/0x60 fs/jfs/super.c:105 alloc_inode+0x5d/0x230 fs/inode.c:261 new_inode_pseudo fs/inode.c:1007 [inline] new_inode+0x22/0x270 fs/inode.c:1033 diReadSpecial+0x51/0x6e0 fs/jfs/jfs_imap.c:423 jfs_mount+0x322/0x8a0 fs/jfs/jfs_mount.c:166 jfs_fill_super+0x5a3/0xd20 fs/jfs/super.c:556 mount_bdev+0x1e3/0x2d0 fs/super.c:1658 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1779 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x6e1/0x1f10 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __ia32_sys_mount+0x295/0x320 fs/namespace.c:3875 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x75/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Freed by task 33: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:240 [inline] __kasan_slab_free+0x11d/0x1a0 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+0x12e/0x380 mm/slub.c:4344 i_callback+0x43/0x70 fs/inode.c:250 rcu_do_batch kernel/rcu/tree.c:2196 [inline] rcu_core+0x828/0x16b0 kernel/rcu/tree.c:2471 __do_softirq+0x218/0x922 kernel/softirq.c:554 Last potentially related work creation: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:541 __call_rcu_common.constprop.0+0x9a/0x790 kernel/rcu/tree.c:2734 destroy_inode+0x12c/0x1b0 fs/inode.c:316 iput_final fs/inode.c:1741 [inline] iput.part.0+0x5a8/0x7f0 fs/inode.c:1767 iput+0x5c/0x80 fs/inode.c:1757 diFreeSpecial+0x7a/0x110 fs/jfs/jfs_imap.c:549 jfs_umount+0x193/0x440 fs/jfs/jfs_umount.c:65 jfs_put_super+0x88/0x1d0 fs/jfs/super.c:194 generic_shutdown_super+0x159/0x3d0 fs/super.c:641 kill_block_super+0x3b/0x90 fs/super.c:1675 deactivate_locked_super+0xbe/0x1a0 fs/super.c:472 deactivate_super+0xde/0x100 fs/super.c:505 cleanup_mnt+0x222/0x450 fs/namespace.c:1267 task_work_run+0x14e/0x250 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x278/0x2a0 kernel/entry/common.c:218 __do_fast_syscall_32+0x82/0x120 arch/x86/entry/common.c:389 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e The buggy address belongs to the object at ffff888067461bc0 which belongs to the cache jfs_ip of size 2240 The buggy address is located 1428 bytes inside of freed 2240-byte region [ffff888067461bc0, ffff888067462480) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x67460 head: order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88805d290601 flags: 0x4fff80000000840(slab|head|node=1|zone=1|lastcpupid=0xfff) page_type: 0xffffffff() raw: 04fff80000000840 ffff8880187c6c80 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800d000d 00000001ffffffff ffff88805d290601 head: 04fff80000000840 ffff8880187c6c80 dead000000000122 0000000000000000 head: 0000000000000000 00000000800d000d 00000001ffffffff ffff88805d290601 head: 04fff80000000003 ffffea00019d1801 dead000000000122 00000000ffffffff head: 0000000800000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 5497, tgid 1162495069 (syz-executor.3), ts 5498, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3317 __alloc_pages+0x22b/0x2460 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 mm/slub.c:2175 [inline] allocate_slab mm/slub.c:2338 [inline] new_slab+0xcc/0x3a0 mm/slub.c:2391 ___slab_alloc+0x670/0x16d0 mm/slub.c:3525 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3610 __slab_alloc_node mm/slub.c:3663 [inline] slab_alloc_node mm/slub.c:3835 [inline] kmem_cache_alloc_lru+0x377/0x6f0 mm/slub.c:3864 alloc_inode_sb include/linux/fs.h:3091 [inline] jfs_alloc_inode+0x25/0x60 fs/jfs/super.c:105 alloc_inode+0x5d/0x230 fs/inode.c:261 iget_locked+0x1a1/0x6d0 fs/inode.c:1280 jfs_iget+0x1e/0x4d0 fs/jfs/inode.c:29 jfs_fill_super+0x6c8/0xd20 fs/jfs/super.c:580 mount_bdev+0x1e3/0x2d0 fs/super.c:1658 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1779 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x6e1/0x1f10 fs/namespace.c:3679 page_owner free stack trace missing Memory state around the buggy address: ffff888067462000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888067462080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888067462100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888067462180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888067462200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi