==================================================================
BUG: KASAN: use-after-free in fuse_copy_do fs/fuse/dev.c:765 [inline]
BUG: KASAN: use-after-free in fuse_copy_one+0x1e7/0x3f0 fs/fuse/dev.c:1016
Read of size 256 at addr ffff888120407410 by task syz-executor.1/483

CPU: 0 PID: 483 Comm: syz-executor.1 Not tainted 5.10.158-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x19c/0x1e2 lib/dump_stack.c:118
 print_address_description+0x7e/0x6a0 mm/kasan/report.c:385
 __kasan_report mm/kasan/report.c:545 [inline]
 kasan_report+0x16f/0x210 mm/kasan/report.c:562
 check_memory_region_inline mm/kasan/generic.c:141 [inline]
 check_memory_region+0x2aa/0x2e0 mm/kasan/generic.c:192
 memcpy+0x2d/0x70 mm/kasan/common.c:105
 fuse_copy_do fs/fuse/dev.c:765 [inline]
 fuse_copy_one+0x1e7/0x3f0 fs/fuse/dev.c:1016
 fuse_copy_args+0x309/0x400 fs/fuse/dev.c:1034
 fuse_dev_do_read+0xc44/0x11c0 fs/fuse/dev.c:1309
 fuse_dev_read+0x11b/0x190 fs/fuse/dev.c:1376
 call_read_iter include/linux/fs.h:1898 [inline]
 new_sync_read fs/read_write.c:415 [inline]
 vfs_read+0x915/0xb30 fs/read_write.c:496
 ksys_read+0x157/0x260 fs/read_write.c:634
 __do_sys_read fs/read_write.c:644 [inline]
 __se_sys_read fs/read_write.c:642 [inline]
 __x64_sys_read+0x7b/0x90 fs/read_write.c:642
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7f669dc7f639
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:00007f669d790168 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f669dda01f0 RCX: 00007f669dc7f639
RDX: 0000000000002020 RSI: 0000000020002140 RDI: 0000000000000003
RBP: 00007f669dcdaae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffedd795a9f R14: 00007f669d790300 R15: 0000000000022000

Allocated by task 478:
 kasan_save_stack mm/kasan/common.c:48 [inline]
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc+0x11a/0x150 mm/kasan/common.c:461
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:475
 __kmalloc+0x17d/0x300 mm/slub.c:3971
 kmalloc include/linux/slab.h:557 [inline]
 __d_alloc+0xab/0x6b0 fs/dcache.c:1725
 d_alloc fs/dcache.c:1788 [inline]
 d_alloc_parallel+0x83/0x14a0 fs/dcache.c:2540
 __lookup_slow+0xf0/0x370 fs/namei.c:1531
 lookup_slow+0x5a/0x80 fs/namei.c:1563
 walk_component+0x3ce/0x540 fs/namei.c:1858
 lookup_last fs/namei.c:2307 [inline]
 path_lookupat+0x18e/0x720 fs/namei.c:2331
 filename_lookup+0x1ce/0x650 fs/namei.c:2364
 user_path_at_empty+0x40/0x50 fs/namei.c:2644
 user_path_at include/linux/namei.h:59 [inline]
 do_mount fs/namespace.c:3239 [inline]
 __do_sys_mount fs/namespace.c:3450 [inline]
 __se_sys_mount+0x28c/0x310 fs/namespace.c:3427
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3427
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xc6

Freed by task 378:
 kasan_save_stack mm/kasan/common.c:48 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:56
 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355
 __kasan_slab_free+0x11c/0x150 mm/kasan/common.c:422
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:431
 slab_free_hook mm/slub.c:1542 [inline]
 slab_free_freelist_hook+0x7f/0x150 mm/slub.c:1576
 slab_free mm/slub.c:3149 [inline]
 kmem_cache_free_bulk+0x3f0/0x590 mm/slub.c:3275
 kfree_bulk include/linux/slab.h:409 [inline]
 kfree_rcu_work+0x26b/0x680 kernel/rcu/tree.c:3229
 process_one_work+0x711/0xce0 kernel/workqueue.c:2279
 worker_thread+0xb17/0x1540 kernel/workqueue.c:2425
 kthread+0x365/0x400 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:299

The buggy address belongs to the object at ffff888120407400
 which belongs to the cache kmalloc-rcl-512 of size 512
The buggy address is located 16 bytes inside of
 512-byte region [ffff888120407400, ffff888120407600)
The buggy address belongs to the page:
page:00000000d3d8010a refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x120404
head:00000000d3d8010a order:2 compound_mapcount:0 compound_pincount:0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 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)
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2279 [inline]
 prep_new_page+0x14e/0x160 mm/page_alloc.c:2285
 get_page_from_freelist+0x598/0x5d0 mm/page_alloc.c:3913
 __alloc_pages_nodemask+0x2b6/0x740 mm/page_alloc.c:4991
 alloc_slab_page mm/slub.c:1761 [inline]
 allocate_slab+0x72/0x580 mm/slub.c:1763
 new_slab mm/slub.c:1824 [inline]
 new_slab_objects mm/slub.c:2582 [inline]
 ___slab_alloc+0x131/0x2e0 mm/slub.c:2746
 __slab_alloc+0x63/0xa0 mm/slub.c:2786
 slab_alloc_node mm/slub.c:2861 [inline]
 slab_alloc mm/slub.c:2904 [inline]
 __kmalloc+0x10a/0x300 mm/slub.c:3967
 kmalloc include/linux/slab.h:557 [inline]
 __d_alloc+0xab/0x6b0 fs/dcache.c:1725
 d_alloc fs/dcache.c:1788 [inline]
 d_alloc_parallel+0x83/0x14a0 fs/dcache.c:2540
 __lookup_slow+0xf0/0x370 fs/namei.c:1531
 lookup_slow+0x5a/0x80 fs/namei.c:1563
 walk_component+0x3ce/0x540 fs/namei.c:1858
 lookup_last fs/namei.c:2307 [inline]
 path_lookupat+0x18e/0x720 fs/namei.c:2331
 filename_lookup+0x1ce/0x650 fs/namei.c:2364
 user_path_at_empty+0x40/0x50 fs/namei.c:2644
 user_path_at include/linux/namei.h:59 [inline]
 do_mount fs/namespace.c:3239 [inline]
 __do_sys_mount fs/namespace.c:3450 [inline]
 __se_sys_mount+0x28c/0x310 fs/namespace.c:3427
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888120407300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888120407380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888120407400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff888120407480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888120407500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================