================================================================== BUG: KASAN: use-after-free in __list_add_valid+0x81/0xa0 lib/list_debug.c:23 Read of size 8 at addr ffff88808cef8980 by task syz-executor538/8116 CPU: 0 PID: 8116 Comm: syz-executor538 Not tainted 4.19.195-syzkaller #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+0x1fc/0x2ef lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433 __list_add_valid+0x81/0xa0 lib/list_debug.c:23 __list_add include/linux/list.h:60 [inline] list_add include/linux/list.h:79 [inline] chrdev_open+0x4b9/0x770 fs/char_dev.c:405 do_dentry_open+0x4aa/0x1160 fs/open.c:796 do_last fs/namei.c:3421 [inline] path_openat+0x793/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x446809 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 15 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f60b3b3c2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00000000004d0510 RCX: 0000000000446809 RDX: 0000000000000000 RSI: 0000000020002100 RDI: 00000000ffffff9c RBP: 00000000004a013c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000049e138 R13: 2f30656c69662f2e R14: 0000000100000001 R15: 00000000004d0518 Allocated by task 8109: kmem_cache_alloc+0x122/0x370 mm/slab.c:3559 fuse_alloc_inode+0x1d/0x3f0 fs/fuse/inode.c:87 alloc_inode+0x5d/0x180 fs/inode.c:211 iget5_locked fs/inode.c:1131 [inline] iget5_locked+0x57/0xd0 fs/inode.c:1124 fuse_iget+0x1a6/0x800 fs/fuse/inode.c:307 fuse_lookup_name+0x413/0x5c0 fs/fuse/dir.c:341 fuse_lookup+0xdf/0x410 fs/fuse/dir.c:368 fuse_atomic_open+0x20a/0x330 fs/fuse/dir.c:508 atomic_open fs/namei.c:3073 [inline] lookup_open+0x1023/0x1a20 fs/namei.c:3205 do_last fs/namei.c:3327 [inline] path_openat+0x1804/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 18: __cache_free mm/slab.c:3503 [inline] kmem_cache_free+0x7f/0x260 mm/slab.c:3765 __rcu_reclaim kernel/rcu/rcu.h:236 [inline] rcu_do_batch kernel/rcu/tree.c:2584 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2864 [inline] rcu_process_callbacks+0x8ff/0x18b0 kernel/rcu/tree.c:2881 __do_softirq+0x265/0x980 kernel/softirq.c:292 The buggy address belongs to the object at ffff88808cef8600 which belongs to the cache fuse_inode of size 1264 The buggy address is located 896 bytes inside of 1264-byte region [ffff88808cef8600, ffff88808cef8af0) The buggy address belongs to the page: page:ffffea000233be00 count:1 mapcount:0 mapping:ffff8880b0e9da80 index:0xffff88808cef8ffe flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea000233d4c8 ffff8880b0e9eb48 ffff8880b0e9da80 raw: ffff88808cef8ffe ffff88808cef8080 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808cef8880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808cef8900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88808cef8980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808cef8a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808cef8a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ==================================================================