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BUG: KASAN: use-after-free in fuse_copy_one+0x1bd/0x3c0 fs/fuse/dev.c:1023
Read of size 256 at addr ffff88812354ec10 by task syz-executor.4/393

CPU: 1 PID: 393 Comm: syz-executor.4 Not tainted 5.15.131-syzkaller-1068696-gea586874d2f9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
 print_address_description+0x87/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:444
 kasan_check_range+0x293/0x2a0 mm/kasan/generic.c:189
 memcpy+0x2d/0x70 mm/kasan/shadow.c:65
 fuse_copy_one+0x1bd/0x3c0 fs/fuse/dev.c:1023
 fuse_copy_args+0x336/0x410 fs/fuse/dev.c:1041
 fuse_dev_do_read+0xc87/0x11d0 fs/fuse/dev.c:1316
 fuse_dev_read+0x182/0x210 fs/fuse/dev.c:1383
 call_read_iter include/linux/fs.h:2153 [inline]
 new_sync_read fs/read_write.c:404 [inline]
 vfs_read+0xa7e/0xd40 fs/read_write.c:485
 ksys_read+0x199/0x2c0 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+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f4132737db9
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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f41322580c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f41328581f0 RCX: 00007f4132737db9
RDX: 0000000000002020 RSI: 0000000020002140 RDI: 0000000000000003
RBP: 00007f4132794ad0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f41328581f0 R15: 00007ffd45969b38
 </TASK>

Allocated by task 380:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:433 [inline]
 ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:512
 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:521
 kasan_kmalloc include/linux/kasan.h:227 [inline]
 __kmalloc+0x13a/0x270 mm/slub.c:4427
 kmalloc include/linux/slab.h:608 [inline]
 __d_alloc+0xad/0x6c0 fs/dcache.c:1760
 d_alloc fs/dcache.c:1823 [inline]
 d_alloc_parallel+0xe1/0x1270 fs/dcache.c:2575
 __lookup_slow+0x154/0x400 fs/namei.c:1644
 lookup_slow+0x5a/0x80 fs/namei.c:1676
 walk_component+0x48c/0x610 fs/namei.c:1972
 lookup_last fs/namei.c:2427 [inline]
 path_lookupat+0x16d/0x450 fs/namei.c:2451
 filename_lookup+0x230/0x5c0 fs/namei.c:2480
 user_path_at_empty+0x43/0x1a0 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+0x285/0x3b0 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+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Freed by task 39:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:365
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
 kasan_slab_free include/linux/kasan.h:193 [inline]
 slab_free_hook mm/slub.c:1723 [inline]
 slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1749
 slab_free mm/slub.c:3519 [inline]
 kmem_cache_free_bulk+0x552/0x700 mm/slub.c:3660
 kfree_bulk include/linux/slab.h:460 [inline]
 kfree_rcu_work+0x2b2/0x6a0 kernel/rcu/tree.c:3282
 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2317
 worker_thread+0xad5/0x12a0 kernel/workqueue.c:2464
 kthread+0x421/0x510 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:348
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358
 kvfree_call_rcu+0xb2/0x7d0 kernel/rcu/tree.c:3583
 copy_name fs/dcache.c:2844 [inline]
 __d_move+0x86e/0x1370 fs/dcache.c:2907
 __d_unalias+0x1cc/0x220 fs/dcache.c:3021
 d_splice_alias+0x20a/0x390 fs/dcache.c:3084
 fuse_lookup+0x2b9/0x5f0 fs/fuse/dir.c:631
 __lookup_slow+0x2b9/0x400 fs/namei.c:1659
 lookup_slow+0x5a/0x80 fs/namei.c:1676
 walk_component+0x48c/0x610 fs/namei.c:1972
 link_path_walk+0x642/0xd90
 path_parentat fs/namei.c:2498 [inline]
 filename_parentat+0x23a/0x650 fs/namei.c:2521
 filename_create+0xf0/0x520 fs/namei.c:3746
 do_mkdirat+0xbd/0x450 fs/namei.c:4009
 __do_sys_mkdir fs/namei.c:4039 [inline]
 __se_sys_mkdir fs/namei.c:4037 [inline]
 __x64_sys_mkdir+0x6e/0x80 fs/namei.c:4037
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

The buggy address belongs to the object at ffff88812354ec00
 which belongs to the cache kmalloc-rcl-512 of size 512
The buggy address is located 16 bytes inside of
 512-byte region [ffff88812354ec00, ffff88812354ee00)
The buggy address belongs to the page:
page:ffffea00048d5300 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12354c
head:ffffea00048d5300 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 0000000000000000 dead000000000122 ffff88810004c300
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 380, ts 42458018986, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2602
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2608
 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4482
 __alloc_pages+0x206/0x5e0 mm/page_alloc.c:5773
 allocate_slab mm/slub.c:1932 [inline]
 new_slab+0x9a/0x4e0 mm/slub.c:1995
 ___slab_alloc+0x39e/0x830 mm/slub.c:3028
 __slab_alloc+0x4a/0x90 mm/slub.c:3115
 slab_alloc_node mm/slub.c:3206 [inline]
 slab_alloc mm/slub.c:3248 [inline]
 __kmalloc+0x16d/0x270 mm/slub.c:4423
 kmalloc include/linux/slab.h:608 [inline]
 __d_alloc+0xad/0x6c0 fs/dcache.c:1760
 d_alloc fs/dcache.c:1823 [inline]
 d_alloc_parallel+0xe1/0x1270 fs/dcache.c:2575
 __lookup_slow+0x154/0x400 fs/namei.c:1644
 lookup_slow+0x5a/0x80 fs/namei.c:1676
 walk_component+0x48c/0x610 fs/namei.c:1972
 lookup_last fs/namei.c:2427 [inline]
 path_lookupat+0x16d/0x450 fs/namei.c:2451
 filename_lookup+0x230/0x5c0 fs/namei.c:2480
 user_path_at_empty+0x43/0x1a0 fs/namei.c:2853
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88812354eb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88812354eb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88812354ec00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff88812354ec80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88812354ed00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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