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BUG: KASAN: use-after-free in fuse_copy_one+0x1e7/0x3f0 fs/fuse/dev.c:1012
Read of size 256 at addr ffff888123f4f810 by task syz-executor.3/872

CPU: 1 PID: 872 Comm: syz-executor.3 Not tainted 5.15.82-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
 print_address_description+0x87/0x3c0 mm/kasan/report.c:256
 __kasan_report mm/kasan/report.c:442 [inline]
 kasan_report+0x1a2/0x1f0 mm/kasan/report.c:459
 kasan_check_range+0x2aa/0x2e0 mm/kasan/generic.c:189
 memcpy+0x2d/0x70 mm/kasan/shadow.c:65
 fuse_copy_one+0x1e7/0x3f0 fs/fuse/dev.c:1012
 fuse_copy_args+0x309/0x400 fs/fuse/dev.c:1030
 fuse_dev_do_read+0xc9b/0x1190 fs/fuse/dev.c:1305
 fuse_dev_read+0x180/0x210 fs/fuse/dev.c:1372
 call_read_iter include/linux/fs.h:2081 [inline]
 new_sync_read fs/read_write.c:404 [inline]
 vfs_read+0xabc/0xd80 fs/read_write.c:485
 ksys_read+0x198/0x2c0 fs/read_write.c:623
 __do_sys_read fs/read_write.c:633 [inline]
 __se_sys_read fs/read_write.c:631 [inline]
 __x64_sys_read+0x7b/0x90 fs/read_write.c:631
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f6cfaf77639
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6cfaa88168 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f6cfb0981f0 RCX: 00007f6cfaf77639
RDX: 0000000000002020 RSI: 0000000020002140 RDI: 0000000000000003
RBP: 00007f6cfafd2ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff8017085f R14: 00007f6cfaa88300 R15: 0000000000022000
 </TASK>

Allocated by task 859:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:513
 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:522
 kasan_kmalloc include/linux/kasan.h:264 [inline]
 __kmalloc+0x203/0x350 mm/slub.c:4407
 kmalloc include/linux/slab.h:596 [inline]
 __d_alloc+0xab/0x6b0 fs/dcache.c:1760
 d_alloc fs/dcache.c:1823 [inline]
 d_alloc_parallel+0xe0/0x12b0 fs/dcache.c:2575
 __lookup_slow+0x14e/0x400 fs/namei.c:1644
 lookup_slow+0x5a/0x80 fs/namei.c:1676
 walk_component+0x425/0x5a0 fs/namei.c:1972
 lookup_last fs/namei.c:2427 [inline]
 path_lookupat+0x18d/0x460 fs/namei.c:2451
 filename_lookup+0x277/0x640 fs/namei.c:2480
 user_path_at_empty+0x44/0x1b0 fs/namei.c:2853
 user_path_at include/linux/namei.h:57 [inline]
 do_mount fs/namespace.c:3334 [inline]
 __do_sys_mount fs/namespace.c:3545 [inline]
 __se_sys_mount+0x293/0x3c0 fs/namespace.c:3522
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3522
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Freed by task 78:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:46
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:360
 ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:366
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1705 [inline]
 slab_free_freelist_hook+0xc9/0x1a0 mm/slub.c:1731
 slab_free mm/slub.c:3499 [inline]
 kmem_cache_free_bulk+0x3dc/0x700 mm/slub.c:3640
 kfree_bulk include/linux/slab.h:448 [inline]
 kfree_rcu_work+0x2cb/0x6c0 kernel/rcu/tree.c:3281
 process_one_work+0x6db/0xc00 kernel/workqueue.c:2306
 worker_thread+0xb3e/0x1340 kernel/workqueue.c:2453
 kthread+0x41c/0x500 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Last potentially related work creation:
 kasan_save_stack+0x36/0x60 mm/kasan/common.c:38
 kasan_record_aux_stack+0xca/0xf0 mm/kasan/generic.c:348
 kvfree_call_rcu+0xb2/0x7f0 kernel/rcu/tree.c:3559
 copy_name fs/dcache.c:2844 [inline]
 __d_move+0xb68/0x1a80 fs/dcache.c:2907
 __d_unalias+0x1cc/0x220 fs/dcache.c:3021
 d_splice_alias+0x22f/0x3b0 fs/dcache.c:3084
 fuse_lookup+0x2b4/0x5f0 fs/fuse/dir.c:438
 __lookup_slow+0x2b3/0x400 fs/namei.c:1659
 lookup_slow+0x5a/0x80 fs/namei.c:1676
 walk_component+0x425/0x5a0 fs/namei.c:1972
 link_path_walk+0x682/0xde0
 path_parentat fs/namei.c:2498 [inline]
 filename_parentat+0x27e/0x6b0 fs/namei.c:2521
 filename_create+0xef/0x4f0 fs/namei.c:3689
 do_mkdirat+0xc2/0x420 fs/namei.c:3952
 __do_sys_mkdir fs/namei.c:3983 [inline]
 __se_sys_mkdir fs/namei.c:3981 [inline]
 __x64_sys_mkdir+0x6e/0x80 fs/namei.c:3981
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

The buggy address belongs to the object at ffff888123f4f800
 which belongs to the cache kmalloc-rcl-512 of size 512
The buggy address is located 16 bytes inside of
 512-byte region [ffff888123f4f800, ffff888123f4fa00)
The buggy address belongs to the page:
page:ffffea00048fd300 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x123f4c
head:ffffea00048fd300 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x8000000000010200(slab|head|zone=2)
raw: 8000000000010200 0000000000000000 dead000000000122 ffff888100042dc0
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Reclaimable, gfp_mask 0x1d20d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 805, ts 49025847105, free_ts 0
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2420 [inline]
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x58e/0x5a0 mm/page_alloc.c:4159
 __alloc_pages+0x3bd/0x850 mm/page_alloc.c:5421
 allocate_slab+0x66/0x510 mm/slub.c:1912
 new_slab mm/slub.c:1975 [inline]
 ___slab_alloc+0x2e2/0x6f0 mm/slub.c:3008
 __slab_alloc+0x4a/0x90 mm/slub.c:3095
 slab_alloc_node mm/slub.c:3186 [inline]
 slab_alloc mm/slub.c:3228 [inline]
 __kmalloc+0x25b/0x350 mm/slub.c:4403
 kmalloc include/linux/slab.h:596 [inline]
 __d_alloc+0xab/0x6b0 fs/dcache.c:1760
 d_alloc fs/dcache.c:1823 [inline]
 d_alloc_parallel+0xe0/0x12b0 fs/dcache.c:2575
 __lookup_slow+0x14e/0x400 fs/namei.c:1644
 lookup_slow+0x5a/0x80 fs/namei.c:1676
 walk_component+0x425/0x5a0 fs/namei.c:1972
 lookup_last fs/namei.c:2427 [inline]
 path_lookupat+0x18d/0x460 fs/namei.c:2451
 filename_lookup+0x277/0x640 fs/namei.c:2480
 user_path_at_empty+0x44/0x1b0 fs/namei.c:2853
 user_path_at include/linux/namei.h:57 [inline]
 vfs_statx+0x104/0x6a0 fs/stat.c:221
 vfs_fstatat fs/stat.c:243 [inline]
 __do_sys_newfstatat fs/stat.c:411 [inline]
 __se_sys_newfstatat+0xc8/0x780 fs/stat.c:405
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888123f4f700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888123f4f780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888123f4f800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff888123f4f880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888123f4f900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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