================================================================== BUG: KASAN: use-after-free in io_sendrecv_fail+0x3b0/0x3e0 io_uring/net.c:1221 Write of size 8 at addr ffff88801c478480 by task syz-executor.2/9858 CPU: 0 PID: 9858 Comm: syz-executor.2 Not tainted 6.0.0-rc6-next-20220923-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15e/0x45d mm/kasan/report.c:395 kasan_report+0xbb/0x1f0 mm/kasan/report.c:495 io_sendrecv_fail+0x3b0/0x3e0 io_uring/net.c:1221 io_req_complete_failed+0x155/0x1b0 io_uring/io_uring.c:873 io_queue_sqe_fallback+0x155/0x190 io_uring/io_uring.c:1936 io_submit_state_end io_uring/io_uring.c:2177 [inline] io_submit_sqes+0x18bd/0x1df0 io_uring/io_uring.c:2291 __do_sys_io_uring_enter+0xac6/0x2410 io_uring/io_uring.c:3216 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fb5cd88a5a9 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:00007fb5ce9d2168 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 00007fb5cd9ac050 RCX: 00007fb5cd88a5a9 RDX: 0000000000000000 RSI: 0000000000006905 RDI: 0000000000000003 RBP: 00007fb5cd8e5580 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd5c3fed7f R14: 00007fb5ce9d2300 R15: 0000000000022000 Allocated by task 9858: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa1/0xb0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:934 [inline] __kmalloc+0x54/0xc0 mm/slab_common.c:947 kmalloc include/linux/slab.h:564 [inline] io_alloc_async_data+0x9b/0x160 io_uring/io_uring.c:1590 io_msg_alloc_async io_uring/net.c:138 [inline] io_msg_alloc_async_prep io_uring/net.c:147 [inline] io_sendmsg_prep_async+0x19b/0x3c0 io_uring/net.c:221 io_req_prep_async+0x1d9/0x300 io_uring/io_uring.c:1613 io_queue_sqe_fallback+0xd3/0x190 io_uring/io_uring.c:1933 io_submit_state_end io_uring/io_uring.c:2177 [inline] io_submit_sqes+0x18bd/0x1df0 io_uring/io_uring.c:2291 __do_sys_io_uring_enter+0xac6/0x2410 io_uring/io_uring.c:3216 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 9858: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2a/0x40 mm/kasan/generic.c:511 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1669 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1695 slab_free mm/slub.c:3599 [inline] __kmem_cache_free+0xab/0x3b0 mm/slub.c:3612 io_sendrecv_fail+0x2a4/0x3e0 io_uring/net.c:1220 io_req_complete_failed+0x155/0x1b0 io_uring/io_uring.c:873 io_queue_sqe_fallback+0x155/0x190 io_uring/io_uring.c:1936 io_submit_state_end io_uring/io_uring.c:2177 [inline] io_submit_sqes+0x18bd/0x1df0 io_uring/io_uring.c:2291 __do_sys_io_uring_enter+0xac6/0x2410 io_uring/io_uring.c:3216 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:481 kvfree_call_rcu+0x74/0x8f0 kernel/rcu/tree.c:3341 ma_put net/ipv6/mcast.c:869 [inline] ma_put+0x11c/0x180 net/ipv6/mcast.c:865 __ipv6_dev_mc_dec+0x278/0x340 net/ipv6/mcast.c:982 ipv6_mc_destroy_dev+0x2c6/0x630 net/ipv6/mcast.c:2800 addrconf_ifdown.isra.0+0x1488/0x19a0 net/ipv6/addrconf.c:3893 addrconf_notify+0xeb/0x1c10 net/ipv6/addrconf.c:3673 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1945 call_netdevice_notifiers_extack net/core/dev.c:1983 [inline] call_netdevice_notifiers net/core/dev.c:1997 [inline] unregister_netdevice_many+0xaef/0x1a40 net/core/dev.c:10860 vti6_exit_batch_net+0x3a0/0x670 net/ipv6/ip6_vti.c:1190 ops_exit_list+0x125/0x170 net/core/net_namespace.c:168 setup_net+0x7fb/0xc50 net/core/net_namespace.c:349 copy_net_ns+0x318/0x760 net/core/net_namespace.c:472 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 copy_namespaces+0x391/0x450 kernel/nsproxy.c:178 copy_process+0x306e/0x71b0 kernel/fork.c:2259 kernel_clone+0xe7/0x980 kernel/fork.c:2676 __do_sys_clone+0xba/0x100 kernel/fork.c:2817 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88801c478400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 128 bytes inside of 512-byte region [ffff88801c478400, ffff88801c478600) The buggy address belongs to the physical page: page:ffffea0000711e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffffea00007c7100 pfn:0x1c478 head:ffffea0000711e00 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888011841c80 dead000080100010 0000000000000000 raw: ffffea00007c7100 dead000000000002 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 7256208041, free_ts 0 prep_new_page mm/page_alloc.c:2538 [inline] get_page_from_freelist+0x1092/0x2d20 mm/page_alloc.c:4287 __alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5546 alloc_page_interleave+0x1e/0x200 mm/mempolicy.c:2113 alloc_pages+0x22f/0x270 mm/mempolicy.c:2275 alloc_slab_page mm/slub.c:1739 [inline] allocate_slab+0x213/0x300 mm/slub.c:1884 new_slab mm/slub.c:1937 [inline] ___slab_alloc+0xac1/0x1430 mm/slub.c:3119 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3217 slab_alloc_node mm/slub.c:3302 [inline] __kmem_cache_alloc_node+0x18a/0x3d0 mm/slub.c:3375 kmalloc_trace+0x22/0x60 mm/slab_common.c:1014 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:695 [inline] device_private_init drivers/base/core.c:3361 [inline] device_add+0x1168/0x1e90 drivers/base/core.c:3411 tty_register_device_attr+0x38e/0x7a0 drivers/tty/tty_io.c:3253 tty_register_device drivers/tty/tty_io.c:3188 [inline] tty_register_driver+0x428/0x800 drivers/tty/tty_io.c:3453 legacy_pty_init drivers/tty/pty.c:579 [inline] pty_init+0x648/0xdfc drivers/tty/pty.c:943 do_one_initcall+0x13d/0x780 init/main.c:1307 do_initcall_level init/main.c:1382 [inline] do_initcalls init/main.c:1398 [inline] do_basic_setup init/main.c:1417 [inline] kernel_init_freeable+0x6ff/0x788 init/main.c:1637 kernel_init+0x1a/0x1d0 init/main.c:1525 page_owner free stack trace missing Memory state around the buggy address: ffff88801c478380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801c478400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801c478480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801c478500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801c478580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================