================================================================== BUG: KASAN: slab-out-of-bounds in btrfs_qgroup_inherit+0x426/0x2a70 fs/btrfs/qgroup.c:3263 Read of size 8 at addr ffff88810deff5d0 by task syz-executor.4/5021 CPU: 0 PID: 5021 Comm: syz-executor.4 Not tainted 6.8.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xf8/0x260 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0x167/0x540 mm/kasan/report.c:488 kasan_report+0x142/0x180 mm/kasan/report.c:601 btrfs_qgroup_inherit+0x426/0x2a70 fs/btrfs/qgroup.c:3263 create_pending_snapshot+0x127f/0x26e0 fs/btrfs/transaction.c:1858 create_pending_snapshots+0x86/0x1a0 fs/btrfs/transaction.c:1928 btrfs_commit_transaction+0xfb3/0x3820 fs/btrfs/transaction.c:2388 create_snapshot+0x517/0x860 fs/btrfs/ioctl.c:875 btrfs_mksubvol+0x4d4/0x630 fs/btrfs/ioctl.c:1029 btrfs_mksnapshot+0x98/0xe0 fs/btrfs/ioctl.c:1075 __btrfs_ioctl_snap_create+0x2c1/0x3a0 fs/btrfs/ioctl.c:1340 btrfs_ioctl_snap_create_v2+0x185/0x310 fs/btrfs/ioctl.c:1422 btrfs_ioctl+0x8e0/0xaa0 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xab/0xf0 fs/ioctl.c:857 do_syscall_64+0x94/0x1a0 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7effb927cee9 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:00007effb9f1c0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007effb93b4050 RCX: 00007effb927cee9 RDX: 0000000020000280 RSI: 0000000050009417 RDI: 0000000000000003 RBP: 00007effb92da6fe R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007effb93b4050 R15: 00007fff59317a98 Allocated by task 5021: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:3981 [inline] __kmalloc_node_track_caller+0x22a/0x4b0 mm/slub.c:4001 memdup_user+0x26/0x80 mm/util.c:197 btrfs_ioctl_snap_create_v2+0x29f/0x310 fs/btrfs/ioctl.c:1411 btrfs_ioctl+0x8e0/0xaa0 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xab/0xf0 fs/ioctl.c:857 do_syscall_64+0x94/0x1a0 entry_SYSCALL_64_after_hwframe+0x6f/0x77 The buggy address belongs to the object at ffff88810deff580 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 0 bytes to the right of allocated 80-byte region [ffff88810deff580, ffff88810deff5d0) The buggy address belongs to the physical page: page:ffffea000437bfc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10deff flags: 0x100000000000800(slab|node=0|zone=2) page_type: 0xffffffff() raw: 0100000000000800 ffff888100041780 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080200020 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 0x112c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 4800, tgid 4800 (udevd), ts 71434621083, free_ts 71381049624 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x10f/0x130 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x3e5f/0x4080 mm/page_alloc.c:3311 __alloc_pages+0x255/0x650 mm/page_alloc.c:4567 __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:2190 allocate_slab mm/slub.c:2354 [inline] new_slab+0x70/0x270 mm/slub.c:2407 ___slab_alloc+0xa79/0x10b0 mm/slub.c:3540 __slab_alloc mm/slub.c:3625 [inline] __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] __do_kmalloc_node mm/slub.c:3980 [inline] __kmalloc+0x2ba/0x480 mm/slub.c:3994 kmalloc include/linux/slab.h:594 [inline] kzalloc include/linux/slab.h:711 [inline] tomoyo_encode2 security/tomoyo/realpath.c:45 [inline] tomoyo_encode+0xaa/0x490 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0x4a9/0x4e0 security/tomoyo/realpath.c:283 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path2_perm+0x349/0x9f0 security/tomoyo/file.c:922 tomoyo_path_rename+0x169/0x1b0 security/tomoyo/tomoyo.c:300 security_path_rename+0xeb/0x1a0 security/security.c:1913 do_renameat2+0x738/0x1010 fs/namei.c:5027 __do_sys_rename fs/namei.c:5087 [inline] __se_sys_rename fs/namei.c:5085 [inline] __x64_sys_rename+0x81/0x90 fs/namei.c:5085 do_syscall_64+0x94/0x1a0 entry_SYSCALL_64_after_hwframe+0x6f/0x77 page last free pid 4978 tgid 4978 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x87f/0x9a0 mm/page_alloc.c:2346 free_unref_page+0x37/0x3a0 mm/page_alloc.c:2486 __slab_free+0x2fc/0x3c0 mm/slub.c:4211 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:3813 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmem_cache_alloc+0x15a/0x390 mm/slub.c:3867 getname_flags+0xa0/0x440 fs/namei.c:140 do_sys_openat2+0xb0/0x180 fs/open.c:1398 do_sys_open fs/open.c:1419 [inline] __do_sys_openat fs/open.c:1435 [inline] __se_sys_openat fs/open.c:1430 [inline] __x64_sys_openat+0x20d/0x260 fs/open.c:1430 do_syscall_64+0x94/0x1a0 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Memory state around the buggy address: ffff88810deff480: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc ffff88810deff500: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff88810deff580: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ^ ffff88810deff600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88810deff680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================