================================================================== BUG: KASAN: slab-out-of-bounds in dtSplitPage+0x1248/0x37c0 fs/jfs/jfs_dtree.c:-1 Read of size 1 at addr ffff8880479dbfa5 by task syz.0.0/5334 CPU: 0 UID: 0 PID: 5334 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xba/0x230 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 dtSplitPage+0x1248/0x37c0 fs/jfs/jfs_dtree.c:-1 dtSplitUp fs/jfs/jfs_dtree.c:1092 [inline] dtInsert+0x107a/0x5de0 fs/jfs/jfs_dtree.c:871 jfs_mkdir+0x783/0xb00 fs/jfs/namei.c:270 vfs_mkdir+0x511/0x5b0 fs/namei.c:5139 do_mkdirat+0x27d/0x4b0 fs/namei.c:5173 __do_sys_mkdirat fs/namei.c:5195 [inline] __se_sys_mkdirat fs/namei.c:5193 [inline] __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:5193 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f38cfb99b97 Code: 00 66 90 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 db f7 ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 b8 02 01 00 00 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:00007f38d09e6e58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f38d09e6ee0 RCX: 00007f38cfb99b97 RDX: 00000000000001ff RSI: 0000200000000400 RDI: 00000000ffffff9c RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000400 R13: 00007f38d09e6ea0 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 5324: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_lru_noprof+0x35f/0x6c0 mm/slub.c:5282 jfs_alloc_inode+0x28/0x70 fs/jfs/super.c:105 alloc_inode+0x6a/0x1b0 fs/inode.c:346 iget_locked+0x131/0x6a0 fs/inode.c:1470 jfs_iget+0x24/0x470 fs/jfs/inode.c:29 jfs_lookup+0x220/0x420 fs/jfs/namei.c:1469 __lookup_slow+0x2b7/0x410 fs/namei.c:1866 lookup_slow+0x53/0x70 fs/namei.c:1883 walk_component fs/namei.c:2229 [inline] link_path_walk+0xd1e/0x18d0 fs/namei.c:2597 path_parentat fs/namei.c:2801 [inline] __filename_parentat+0x27f/0x6f0 fs/namei.c:2825 filename_parentat fs/namei.c:2843 [inline] do_renameat2+0x22a/0x900 fs/namei.c:6002 __do_sys_renameat2 fs/namei.c:6086 [inline] __se_sys_renameat2 fs/namei.c:6083 [inline] __x64_sys_renameat2+0xce/0xe0 fs/namei.c:6083 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880479db6f0 which belongs to the cache jfs_ip of size 2216 The buggy address is located 13 bytes to the right of allocated 2216-byte region [ffff8880479db6f0, ffff8880479dbf98) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x479d8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff8880493ff601 flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000040 ffff88801a751b40 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800d000d 00000000f5000000 ffff8880493ff601 head: 04fff00000000040 ffff88801a751b40 dead000000000122 0000000000000000 head: 0000000000000000 00000000800d000d 00000000f5000000 ffff8880493ff601 head: 04fff00000000003 ffffea00011e7601 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Reclaimable, gfp_mask 0xd2050(__GFP_RECLAIMABLE|__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5324, tgid 5323 (syz.0.0), ts 87169400303, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x228/0x280 mm/page_alloc.c:1884 prep_new_page mm/page_alloc.c:1892 [inline] get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3945 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5240 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486 alloc_slab_page mm/slub.c:3075 [inline] allocate_slab+0x86/0x3a0 mm/slub.c:3248 new_slab mm/slub.c:3302 [inline] ___slab_alloc+0xd82/0x1760 mm/slub.c:4656 __slab_alloc+0x65/0x100 mm/slub.c:4779 __slab_alloc_node mm/slub.c:4855 [inline] slab_alloc_node mm/slub.c:5251 [inline] kmem_cache_alloc_lru_noprof+0x3ed/0x6c0 mm/slub.c:5282 jfs_alloc_inode+0x28/0x70 fs/jfs/super.c:105 alloc_inode+0x6a/0x1b0 fs/inode.c:346 new_inode+0x22/0x170 fs/inode.c:1175 jfs_fill_super+0x569/0xd80 fs/jfs/super.c:511 get_tree_bdev_flags+0x431/0x4f0 fs/super.c:1691 vfs_get_tree+0x92/0x2a0 fs/super.c:1751 fc_mount fs/namespace.c:1199 [inline] do_new_mount_fc fs/namespace.c:3636 [inline] do_new_mount+0x329/0xa50 fs/namespace.c:3712 do_mount fs/namespace.c:4035 [inline] __do_sys_mount fs/namespace.c:4224 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4201 page_owner free stack trace missing Memory state around the buggy address: ffff8880479dbe80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880479dbf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880479dbf80: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880479dc000: fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880479dc080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================