================================================================== BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:71 [inline] BUG: KASAN: use-after-free in test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] BUG: KASAN: use-after-free in nbd_genl_connect+0x235/0x16a0 drivers/block/nbd.c:1869 Read of size 8 at addr ffff8881463eeab0 by task syz-executor010/6561 CPU: 1 PID: 6561 Comm: syz-executor010 Not tainted 5.14.0-rc6-next-20210820-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:71 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] nbd_genl_connect+0x235/0x16a0 drivers/block/nbd.c:1869 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:731 genl_family_rcv_msg net/netlink/genetlink.c:775 [inline] genl_rcv_msg+0x32d/0x590 net/netlink/genetlink.c:792 netlink_rcv_skb+0x154/0x430 net/netlink/af_netlink.c:2504 genl_rcv+0x24/0x40 net/netlink/genetlink.c:803 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:724 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2403 ___sys_sendmsg+0xf3/0x170 net/socket.c:2457 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2486 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4406d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 14 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffec8655a78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000000103b8 RCX: 00000000004406d9 RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffec8655c18 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffec8655a8c R13: 431bde82d7b634db R14: 00000000004ae018 R15: 00000000004004a0 Allocated by task 1: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0xa8/0xe0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:594 [inline] kzalloc include/linux/slab.h:731 [inline] nbd_dev_add+0x54/0xaf0 drivers/block/nbd.c:1696 nbd_init+0x297/0x2a7 drivers/block/nbd.c:2457 do_one_initcall+0x103/0x650 init/main.c:1292 do_initcall_level init/main.c:1367 [inline] do_initcalls init/main.c:1383 [inline] do_basic_setup init/main.c:1402 [inline] kernel_init_freeable+0x6b4/0x73d init/main.c:1604 kernel_init+0x1a/0x1d0 init/main.c:1496 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Freed by task 10: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0x103/0x140 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1681 [inline] slab_free_freelist_hook+0x85/0x190 mm/slub.c:1706 slab_free mm/slub.c:3459 [inline] kfree+0xea/0x540 mm/slub.c:4519 process_one_work+0x9c9/0x16b0 kernel/workqueue.c:2297 worker_thread+0x65b/0x1200 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xed/0x120 mm/kasan/generic.c:348 insert_work+0x48/0x370 kernel/workqueue.c:1353 __queue_work+0x5d1/0xf30 kernel/workqueue.c:1519 queue_work_on+0xf6/0x110 kernel/workqueue.c:1546 queue_work include/linux/workqueue.h:502 [inline] nbd_put drivers/block/nbd.c:283 [inline] nbd_put+0xd7/0x120 drivers/block/nbd.c:276 nbd_genl_connect+0xc73/0x16a0 drivers/block/nbd.c:2019 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:731 genl_family_rcv_msg net/netlink/genetlink.c:775 [inline] genl_rcv_msg+0x32d/0x590 net/netlink/genetlink.c:792 netlink_rcv_skb+0x154/0x430 net/netlink/af_netlink.c:2504 genl_rcv+0x24/0x40 net/netlink/genetlink.c:803 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:724 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2403 ___sys_sendmsg+0xf3/0x170 net/socket.c:2457 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2486 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff8881463ee800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 688 bytes inside of 1024-byte region [ffff8881463ee800, ffff8881463eec00) The buggy address belongs to the page: page:ffffea000518fa00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8881463ef800 pfn:0x1463e8 head:ffffea000518fa00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x57ff00000010200(slab|head|node=1|zone=2|lastcpupid=0x7ff) raw: 057ff00000010200 ffffea00050c7a08 ffffea00050fe608 ffff888010c41dc0 raw: ffff8881463ef800 000000000010000f 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, ts 7639818470, free_ts 0 prep_new_page mm/page_alloc.c:2424 [inline] get_page_from_freelist+0xa76/0x2f90 mm/page_alloc.c:4151 __alloc_pages+0x1ba/0x510 mm/page_alloc.c:5373 alloc_page_interleave+0x1e/0x200 mm/mempolicy.c:2033 alloc_pages+0x29f/0x300 mm/mempolicy.c:2183 alloc_slab_page mm/slub.c:1744 [inline] allocate_slab mm/slub.c:1881 [inline] new_slab+0x321/0x490 mm/slub.c:1944 ___slab_alloc+0x937/0x1000 mm/slub.c:2970 __slab_alloc.constprop.0+0x51/0xa0 mm/slub.c:3057 slab_alloc_node mm/slub.c:3148 [inline] kmem_cache_alloc_node_trace+0x187/0x400 mm/slub.c:3232 kmalloc_node include/linux/slab.h:613 [inline] kzalloc_node include/linux/slab.h:743 [inline] blk_throtl_init+0x7c/0x660 block/blk-throttle.c:2420 blkcg_init_queue+0x199/0x770 block/blk-cgroup.c:1193 blk_alloc_queue+0x451/0x630 block/blk-core.c:567 blk_mq_init_queue_data block/blk-mq.c:3120 [inline] __blk_mq_alloc_disk+0x47/0x190 block/blk-mq.c:3143 loop_add+0x324/0x940 drivers/block/loop.c:2344 loop_init+0x1f5/0x218 drivers/block/loop.c:2575 do_one_initcall+0x103/0x650 init/main.c:1292 do_initcall_level init/main.c:1367 [inline] do_initcalls init/main.c:1383 [inline] do_basic_setup init/main.c:1402 [inline] kernel_init_freeable+0x6b4/0x73d init/main.c:1604 page_owner free stack trace missing Memory state around the buggy address: ffff8881463ee980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881463eea00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881463eea80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881463eeb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881463eeb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================