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BUG: KASAN: use-after-free in fuse_copy_one fs/fuse/dev.c:1004 [inline]
BUG: KASAN: use-after-free in fuse_copy_args+0x248/0x630 fs/fuse/dev.c:1022
Read of size 256 at addr ffff888127f36c10 by task syz-executor.2/8868

CPU: 1 PID: 8868 Comm: syz-executor.2 Not tainted 6.1.0-rc8-syzkaller-00148-g0d1409e4ff08 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x158/0x4e0 mm/kasan/report.c:395
 kasan_report+0x13c/0x170 mm/kasan/report.c:495
 kasan_check_range+0x294/0x2a0 mm/kasan/generic.c:189
 memcpy+0x2d/0x70 mm/kasan/shadow.c:65
 fuse_copy_one fs/fuse/dev.c:1004 [inline]
 fuse_copy_args+0x248/0x630 fs/fuse/dev.c:1022
 fuse_dev_do_read+0xc87/0x11d0 fs/fuse/dev.c:1297
 fuse_dev_read+0x16d/0x210 fs/fuse/dev.c:1364
 call_read_iter include/linux/fs.h:2193 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x771/0xad0 fs/read_write.c:470
 ksys_read+0x199/0x2c0 fs/read_write.c:613
 __do_sys_read fs/read_write.c:623 [inline]
 __se_sys_read fs/read_write.c:621 [inline]
 __x64_sys_read+0x7b/0x90 fs/read_write.c:621
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x80 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f380e68b639
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:00007f380f30b168 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f380e7ac1f0 RCX: 00007f380e68b639
RDX: 0000000000002020 RSI: 0000000020002140 RDI: 0000000000000003
RBP: 00007f380e6e6ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc5939749f R14: 00007f380f30b300 R15: 0000000000022000
 </TASK>

Allocated by task 8855:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:500
 ____kasan_kmalloc mm/kasan/common.c:371 [inline]
 __kasan_kmalloc+0x9c/0xb0 mm/kasan/common.c:380
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:955 [inline]
 __kmalloc+0xb4/0x1e0 mm/slab_common.c:968
 kmalloc include/linux/slab.h:558 [inline]
 __d_alloc+0xb4/0x6c0 fs/dcache.c:1786
 d_alloc fs/dcache.c:1849 [inline]
 d_alloc_parallel+0xe1/0x1270 fs/dcache.c:2638
 __lookup_slow+0x154/0x3e0 fs/namei.c:1670
 lookup_slow+0x5a/0x80 fs/namei.c:1702
 walk_component+0x2e7/0x410 fs/namei.c:1993
 lookup_last fs/namei.c:2450 [inline]
 path_lookupat+0x16d/0x450 fs/namei.c:2474
 filename_lookup+0x251/0x600 fs/namei.c:2503
 user_path_at_empty+0x43/0x1a0 fs/namei.c:2876
 user_path_at include/linux/namei.h:57 [inline]
 do_mount fs/namespace.c:3380 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x285/0x3b0 fs/namespace.c:3568
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x80 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 56:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:511
 ____kasan_slab_free+0x131/0x180 mm/kasan/common.c:236
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:244
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1724 [inline]
 slab_free_freelist_hook mm/slub.c:1750 [inline]
 slab_free mm/slub.c:3661 [inline]
 kmem_cache_free_bulk+0x636/0x7a0 mm/slub.c:3779
 kfree_bulk include/linux/slab.h:465 [inline]
 kfree_rcu_work+0x2b6/0x720 kernel/rcu/tree.c:3040
 process_one_work+0x6ab/0xc00 kernel/workqueue.c:2289
 worker_thread+0xa5d/0x1260 kernel/workqueue.c:2436
 kthread+0x26d/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

Last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xb4/0xc0 mm/kasan/generic.c:481
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:491
 kvfree_call_rcu+0xaa/0x810 kernel/rcu/tree.c:3343
 copy_name fs/dcache.c:2925 [inline]
 __d_move+0x877/0x13a0 fs/dcache.c:2989
 __d_unalias+0x1cc/0x220 fs/dcache.c:3103
 d_splice_alias+0x20a/0x390 fs/dcache.c:3166
 fuse_lookup+0x2b9/0x5f0 fs/fuse/dir.c:447
 __lookup_slow+0x2b9/0x3e0 fs/namei.c:1685
 lookup_slow+0x5a/0x80 fs/namei.c:1702
 walk_component fs/namei.c:1993 [inline]
 link_path_walk+0x9d3/0xee0 fs/namei.c:2320
 path_parentat fs/namei.c:2521 [inline]
 filename_parentat+0x24c/0x670 fs/namei.c:2544
 filename_create+0xf0/0x520 fs/namei.c:3788
 do_mkdirat+0xbd/0x450 fs/namei.c:4051
 __do_sys_mkdir fs/namei.c:4081 [inline]
 __se_sys_mkdir fs/namei.c:4079 [inline]
 __x64_sys_mkdir+0x6e/0x80 fs/namei.c:4079
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x80 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff888127f36c00
 which belongs to the cache kmalloc-rcl-512 of size 512
The buggy address is located 16 bytes inside of
 512-byte region [ffff888127f36c00, ffff888127f36e00)

The buggy address belongs to the physical page:
page:ffffea00049fcd00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x127f34
head:ffffea00049fcd00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100042dc0
raw: 0000000000000000 0000000000100010 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 8797, tgid 8796 (syz-executor.0), ts 265803064734, free_ts 0
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1e2/0x1f0 mm/page_alloc.c:2532
 prep_new_page mm/page_alloc.c:2539 [inline]
 get_page_from_freelist+0x2e7a/0x2f50 mm/page_alloc.c:4291
 __alloc_pages+0x3e3/0x880 mm/page_alloc.c:5558
 allocate_slab mm/slub.c:1939 [inline]
 new_slab+0xce/0x4c0 mm/slub.c:1992
 ___slab_alloc+0x6f9/0xb80 mm/slub.c:3180
 __slab_alloc+0x5d/0xa0 mm/slub.c:3279
 slab_alloc_node mm/slub.c:3364 [inline]
 __kmem_cache_alloc_node+0x139/0x1c0 mm/slub.c:3437
 __do_kmalloc_node mm/slab_common.c:954 [inline]
 __kmalloc+0xa3/0x1e0 mm/slab_common.c:968
 kmalloc include/linux/slab.h:558 [inline]
 __d_alloc+0xb4/0x6c0 fs/dcache.c:1786
 d_alloc fs/dcache.c:1849 [inline]
 d_alloc_parallel+0xe1/0x1270 fs/dcache.c:2638
 __lookup_slow+0x154/0x3e0 fs/namei.c:1670
 lookup_slow+0x5a/0x80 fs/namei.c:1702
 walk_component+0x2e7/0x410 fs/namei.c:1993
 lookup_last fs/namei.c:2450 [inline]
 path_lookupat+0x16d/0x450 fs/namei.c:2474
 filename_lookup+0x251/0x600 fs/namei.c:2503
 vfs_statx+0x106/0x700 fs/stat.c:229
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888127f36b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888127f36b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888127f36c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff888127f36c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888127f36d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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