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BUG: KASAN: use-after-free in request_end+0x72a/0x910 fs/fuse/dev.c:261
Read of size 8 at addr ffff8880a08d1068 by task syz-executor.2/22404

CPU: 1 PID: 22404 Comm: syz-executor.2 Not tainted 5.3.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x113/0x167 lib/dump_stack.c:113
 print_address_description.cold.8+0x9/0x318 mm/kasan/report.c:351
 __kasan_report.cold.9+0x1b/0x3f mm/kasan/report.c:482
 kasan_report+0x12/0x17 mm/kasan/common.c:618
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
 request_end+0x72a/0x910 fs/fuse/dev.c:261
 fuse_dev_do_read.isra.27+0xf20/0x1c40 fs/fuse/dev.c:1284
 fuse_dev_read+0x138/0x1c0 fs/fuse/dev.c:1317
 call_read_iter include/linux/fs.h:1864 [inline]
 new_sync_read+0x3fa/0x7d0 fs/read_write.c:414
 __vfs_read+0x94/0x110 fs/read_write.c:427
 vfs_read+0x12e/0x330 fs/read_write.c:461
 ksys_read+0x105/0x220 fs/read_write.c:587
 __do_sys_read fs/read_write.c:597 [inline]
 __se_sys_read fs/read_write.c:595 [inline]
 __x64_sys_read+0x6e/0xb0 fs/read_write.c:595
 do_syscall_64+0xd0/0x540 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459a59
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007feddc56dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459a59
RDX: 00000000fffffed0 RSI: 00000000200030c0 RDI: 0000000000000003
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007feddc56e6d4
R13: 00000000004c70e6 R14: 00000000004dca70 R15: 00000000ffffffff

Allocated by task 22404:
 save_stack+0x21/0x90 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc.constprop.9+0xc7/0xd0 mm/kasan/common.c:493
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:507
 kmem_cache_alloc_trace+0x15b/0x780 mm/slab.c:3550
 kmalloc include/linux/slab.h:552 [inline]
 kzalloc include/linux/slab.h:748 [inline]
 fuse_send_init fs/fuse/inode.c:976 [inline]
 fuse_fill_super+0xeed/0x1720 fs/fuse/inode.c:1221
 vfs_get_super+0x10b/0x200 fs/super.c:1183
 get_tree_nodev+0x11/0x20 fs/super.c:1202
 fuse_get_tree+0x9a/0xd0 fs/fuse/inode.c:1252
 vfs_get_tree+0x86/0x2c0 fs/super.c:1517
 do_new_mount fs/namespace.c:2789 [inline]
 do_mount+0x564/0x1ab0 fs/namespace.c:3109
 ksys_mount+0xba/0xe0 fs/namespace.c:3318
 __do_sys_mount fs/namespace.c:3332 [inline]
 __se_sys_mount fs/namespace.c:3329 [inline]
 __x64_sys_mount+0xb9/0x150 fs/namespace.c:3329
 do_syscall_64+0xd0/0x540 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 22392:
 save_stack+0x21/0x90 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:455
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:463
 __cache_free mm/slab.c:3425 [inline]
 kfree+0x108/0x2c0 mm/slab.c:3756
 process_init_reply+0xc8/0x1560 fs/fuse/inode.c:966
 request_end+0x2d6/0x910 fs/fuse/dev.c:308
 end_requests+0x13c/0x220 fs/fuse/dev.c:2038
 fuse_abort_conn+0x961/0xec0 fs/fuse/dev.c:2133
 fuse_sb_destroy+0x7e/0xf0 fs/fuse/inode.c:1293
 fuse_kill_sb_anon+0xd/0x20 fs/fuse/inode.c:1304
 deactivate_locked_super+0x77/0xd0 fs/super.c:331
 deactivate_super+0x136/0x150 fs/super.c:362
 cleanup_mnt+0x204/0x440 fs/namespace.c:1102
 __cleanup_mnt+0xd/0x10 fs/namespace.c:1109
 task_work_run+0x108/0x180 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x24e/0x2e0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x462/0x540 arch/x86/entry/common.c:299
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880a08d1000
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 104 bytes inside of
 192-byte region [ffff8880a08d1000, ffff8880a08d10c0)
The buggy address belongs to the page:
page:ffffea0002823440 refcount:1 mapcount:0 mapping:ffff8880aa400000 index:0x0
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea000282d6c8 ffffea000282d288 ffff8880aa400000
raw: 0000000000000000 ffff8880a08d1000 0000000100000010 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a08d0f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880a08d0f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880a08d1000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                          ^
 ffff8880a08d1080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8880a08d1100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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