================================================================== BUG: KASAN: use-after-free in fuse_request_end+0x825/0x990 fs/fuse/dev.c:279 Read of size 8 at addr ffff8880a19e3068 by task syz-executor.0/9292 CPU: 0 PID: 9292 Comm: syz-executor.0 Not tainted 5.4.0-rc4+ #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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:634 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 fuse_request_end+0x825/0x990 fs/fuse/dev.c:279 fuse_dev_do_read.isra.0+0x115b/0x1df0 fs/fuse/dev.c:1295 fuse_dev_read+0x165/0x200 fs/fuse/dev.c:1328 call_read_iter include/linux/fs.h:1889 [inline] new_sync_read+0x4d7/0x800 fs/read_write.c:414 __vfs_read+0xe1/0x110 fs/read_write.c:427 vfs_read+0x1f0/0x440 fs/read_write.c:461 ksys_read+0x14f/0x290 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+0x73/0xb0 fs/read_write.c:595 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459ef9 Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f8a636fbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459ef9 RDX: 00000000fffffed0 RSI: 00000000200030c0 RDI: 0000000000000003 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8a636fc6d4 R13: 00000000004c76e7 R14: 00000000004dd1d0 R15: 00000000ffffffff Allocated by task 9292: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:510 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:483 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524 kmem_cache_alloc_trace+0x158/0x790 mm/slab.c:3550 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:690 [inline] fuse_send_init+0x48/0x440 fs/fuse/inode.c:974 fuse_fill_super+0x2a6/0x3a0 fs/fuse/inode.c:1257 vfs_get_super+0x13e/0x2e0 fs/super.c:1189 get_tree_nodev+0x23/0x30 fs/super.c:1219 fuse_get_tree+0x12e/0x190 fs/fuse/inode.c:1282 vfs_get_tree+0x8e/0x300 fs/super.c:1545 do_new_mount fs/namespace.c:2823 [inline] do_mount+0x143d/0x1d10 fs/namespace.c:3143 ksys_mount+0xdb/0x150 fs/namespace.c:3352 __do_sys_mount fs/namespace.c:3366 [inline] __se_sys_mount fs/namespace.c:3363 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3363 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9290: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:471 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480 __cache_free mm/slab.c:3425 [inline] kfree+0x10a/0x2c0 mm/slab.c:3756 process_init_reply+0xfb/0x1620 fs/fuse/inode.c:964 fuse_request_end+0x388/0x990 fs/fuse/dev.c:326 end_requests+0x16c/0x240 fs/fuse/dev.c:2049 fuse_abort_conn+0xa4d/0xdb0 fs/fuse/dev.c:2144 fuse_sb_destroy+0xa3/0x120 fs/fuse/inode.c:1325 fuse_kill_sb_anon+0x16/0x30 fs/fuse/inode.c:1336 deactivate_locked_super+0x95/0x100 fs/super.c:335 deactivate_super fs/super.c:366 [inline] deactivate_super+0x1b2/0x1d0 fs/super.c:362 cleanup_mnt+0x351/0x4c0 fs/namespace.c:1102 __cleanup_mnt+0x16/0x20 fs/namespace.c:1109 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x316/0x380 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+0x65f/0x760 arch/x86/entry/common.c:300 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a19e3000 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 104 bytes inside of 192-byte region [ffff8880a19e3000, ffff8880a19e30c0) The buggy address belongs to the page: page:ffffea00028678c0 refcount:1 mapcount:0 mapping:ffff8880aa400000 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea000286b008 ffffea00028538c8 ffff8880aa400000 raw: 0000000000000000 ffff8880a19e3000 0000000100000010 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a19e2f00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff8880a19e2f80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8880a19e3000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a19e3080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880a19e3100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================