================================================================== BUG: KASAN: use-after-free in read_pnet include/net/net_namespace.h:361 [inline] BUG: KASAN: use-after-free in ib2_net include/net/inet_hashtables.h:116 [inline] BUG: KASAN: use-after-free in check_bind2_bucket_match net/ipv4/inet_hashtables.c:765 [inline] BUG: KASAN: use-after-free in inet_bind2_bucket_find+0x562/0x620 net/ipv4/inet_hashtables.c:819 Read of size 8 at addr ffff88807ddb2c00 by task syz-executor.0/13958 CPU: 1 PID: 13958 Comm: syz-executor.0 Not tainted 5.18.0-syzkaller-11267-gb00ed48bb0a7 #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+0xeb/0x495 mm/kasan/report.c:313 print_report mm/kasan/report.c:429 [inline] kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491 read_pnet include/net/net_namespace.h:361 [inline] ib2_net include/net/inet_hashtables.h:116 [inline] check_bind2_bucket_match net/ipv4/inet_hashtables.c:765 [inline] inet_bind2_bucket_find+0x562/0x620 net/ipv4/inet_hashtables.c:819 __inet_hash_connect+0xaaa/0x1450 net/ipv4/inet_hashtables.c:949 dccp_v6_connect+0x9e2/0x14e0 net/dccp/ipv6.c:954 __inet_stream_connect+0x8cf/0xed0 net/ipv4/af_inet.c:660 inet_stream_connect+0x53/0xa0 net/ipv4/af_inet.c:724 __sys_connect_file+0x14f/0x190 net/socket.c:1979 __sys_connect+0x161/0x190 net/socket.c:1996 __do_sys_connect net/socket.c:2006 [inline] __se_sys_connect net/socket.c:2003 [inline] __x64_sys_connect+0x6f/0xb0 net/socket.c:2003 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+0x46/0xb0 RIP: 0033:0x7f8416289109 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:00007f84173bd168 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007f841639bf60 RCX: 00007f8416289109 RDX: 000000000000001c RSI: 0000000020000100 RDI: 0000000000000006 RBP: 00007f84162e308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffce82ac1bf R14: 00007f84173bd300 R15: 0000000000022000 Allocated by task 13917: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:750 [inline] slab_alloc_node mm/slub.c:3214 [inline] slab_alloc mm/slub.c:3222 [inline] __kmem_cache_alloc_lru mm/slub.c:3229 [inline] kmem_cache_alloc+0x204/0x3b0 mm/slub.c:3239 inet_bind2_bucket_create+0x37/0x360 net/ipv4/inet_hashtables.c:91 __inet_hash_connect+0xef5/0x1450 net/ipv4/inet_hashtables.c:951 dccp_v6_connect+0x9e2/0x14e0 net/dccp/ipv6.c:954 __inet_stream_connect+0x8cf/0xed0 net/ipv4/af_inet.c:660 inet_stream_connect+0x53/0xa0 net/ipv4/af_inet.c:724 __sys_connect_file+0x14f/0x190 net/socket.c:1979 __sys_connect+0x161/0x190 net/socket.c:1996 __do_sys_connect net/socket.c:2006 [inline] __se_sys_connect net/socket.c:2003 [inline] __x64_sys_connect+0x6f/0xb0 net/socket.c:2003 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+0x46/0xb0 Freed by task 13917: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1727 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1753 slab_free mm/slub.c:3507 [inline] kmem_cache_free+0xdd/0x5a0 mm/slub.c:3524 inet_bind2_bucket_destroy net/ipv4/inet_hashtables.c:137 [inline] inet_bind2_bucket_destroy net/ipv4/inet_hashtables.c:133 [inline] __inet_put_port net/ipv4/inet_hashtables.c:174 [inline] inet_put_port+0x4a0/0x6f0 net/ipv4/inet_hashtables.c:182 dccp_set_state+0x1be/0x3a0 net/dccp/proto.c:103 dccp_terminate_connection net/dccp/proto.c:969 [inline] dccp_close+0xaa2/0xd50 net/dccp/proto.c:1023 inet_release+0x12e/0x280 net/ipv4/af_inet.c:428 inet6_release+0x4c/0x70 net/ipv6/af_inet6.c:481 __sock_release+0xcd/0x280 net/socket.c:650 sock_close+0x18/0x20 net/socket.c:1365 __fput+0x277/0x9d0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:177 get_signal+0x1c5/0x24c0 kernel/signal.c:2652 arch_do_signal_or_restart+0x82/0x20f0 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop kernel/entry/common.c:166 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 The buggy address belongs to the object at ffff88807ddb2c00 which belongs to the cache dccp_bind2_bucket of size 56 The buggy address is located 0 bytes inside of 56-byte region [ffff88807ddb2c00, ffff88807ddb2c38) The buggy address belongs to the physical page: page:ffffea0001f76c80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7ddb2 memcg:ffff88807701bc01 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00011ddb80 dead000000000007 ffff88814a812140 raw: 0000000000000000 0000000080200020 00000001ffffffff ffff88807701bc01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 7838, tgid 7836 (syz-executor.2), ts 636217127505, free_ts 636209059452 prep_new_page mm/page_alloc.c:2456 [inline] get_page_from_freelist+0x1290/0x3b70 mm/page_alloc.c:4198 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5426 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2272 alloc_slab_page mm/slub.c:1797 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1942 new_slab mm/slub.c:2002 [inline] ___slab_alloc+0x985/0xd90 mm/slub.c:3002 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3089 slab_alloc_node mm/slub.c:3180 [inline] slab_alloc mm/slub.c:3222 [inline] __kmem_cache_alloc_lru mm/slub.c:3229 [inline] kmem_cache_alloc+0x360/0x3b0 mm/slub.c:3239 inet_bind2_bucket_create+0x37/0x360 net/ipv4/inet_hashtables.c:91 __inet_hash_connect+0xef5/0x1450 net/ipv4/inet_hashtables.c:951 dccp_v6_connect+0x9e2/0x14e0 net/dccp/ipv6.c:954 __inet_stream_connect+0x8cf/0xed0 net/ipv4/af_inet.c:660 inet_stream_connect+0x53/0xa0 net/ipv4/af_inet.c:724 __sys_connect_file+0x14f/0x190 net/socket.c:1979 __sys_connect+0x161/0x190 net/socket.c:1996 __do_sys_connect net/socket.c:2006 [inline] __se_sys_connect net/socket.c:2003 [inline] __x64_sys_connect+0x6f/0xb0 net/socket.c:2003 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1371 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1421 free_unref_page_prepare mm/page_alloc.c:3343 [inline] free_unref_page+0x19/0x6a0 mm/page_alloc.c:3438 __vunmap+0x85d/0xd30 mm/vmalloc.c:2665 free_work+0x58/0x70 mm/vmalloc.c:97 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 Memory state around the buggy address: ffff88807ddb2b00: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc ffff88807ddb2b80: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc >ffff88807ddb2c00: fa fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc ^ ffff88807ddb2c80: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc ffff88807ddb2d00: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ==================================================================