================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3ab9/0x5660 kernel/locking/lockdep.c:4923 Read of size 8 at addr ffff88804f384130 by task syz-executor.0/28499 CPU: 0 PID: 28499 Comm: syz-executor.0 Not tainted 5.19.0-rc1-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+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 __lock_acquire+0x3ab9/0x5660 kernel/locking/lockdep.c:4923 lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 lock_sock_nested+0x36/0xf0 net/core/sock.c:3389 lock_sock include/net/sock.h:1691 [inline] nr_accept+0x36f/0x640 net/netrom/af_netrom.c:805 do_accept+0x37c/0x510 net/socket.c:1856 __sys_accept4_file+0x7e/0xe0 net/socket.c:1899 __sys_accept4+0xb0/0x100 net/socket.c:1929 __do_sys_accept net/socket.c:1947 [inline] __se_sys_accept net/socket.c:1944 [inline] __x64_sys_accept+0x71/0xb0 net/socket.c:1944 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: 0033:0x7ff804689109 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:00007ff805704168 EFLAGS: 00000246 ORIG_RAX: 000000000000002b RAX: ffffffffffffffda RBX: 00007ff80479c100 RCX: 00007ff804689109 RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000004 RBP: 00007ff8046e308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffda5c6877f R14: 00007ff805704300 R15: 0000000000022000 Allocated by task 28488: 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_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524 kmalloc include/linux/slab.h:605 [inline] sk_prot_alloc+0x110/0x290 net/core/sock.c:1975 sk_alloc+0x36/0x770 net/core/sock.c:2028 nr_create+0xb2/0x5f0 net/netrom/af_netrom.c:433 __sock_create+0x353/0x790 net/socket.c:1515 sock_create net/socket.c:1566 [inline] __sys_socket_create net/socket.c:1603 [inline] __sys_socket_create net/socket.c:1588 [inline] __sys_socket+0x12f/0x240 net/socket.c:1636 __do_sys_socket net/socket.c:1649 [inline] __se_sys_socket net/socket.c:1647 [inline] __x64_sys_socket+0x6f/0xb0 net/socket.c:1647 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 28485: 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] kfree+0xd6/0x4d0 mm/slub.c:4555 sk_prot_free net/core/sock.c:2011 [inline] __sk_destruct+0x5e5/0x710 net/core/sock.c:2097 sk_destruct net/core/sock.c:2112 [inline] __sk_free+0x1a4/0x4a0 net/core/sock.c:2123 sk_free+0x78/0xa0 net/core/sock.c:2134 sock_put include/net/sock.h:1941 [inline] nr_release+0x39a/0x450 net/netrom/af_netrom.c:554 __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 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x23c/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 Last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 call_rcu+0x99/0x790 kernel/rcu/tree.c:3126 netlink_release+0xf08/0x1db0 net/netlink/af_netlink.c:815 __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 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x23c/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 Second to last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 call_rcu+0x99/0x790 kernel/rcu/tree.c:3126 netlink_release+0xf08/0x1db0 net/netlink/af_netlink.c:815 __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 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x23c/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 ffff88804f384000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 304 bytes inside of 2048-byte region [ffff88804f384000, ffff88804f384800) The buggy address belongs to the physical page: page:ffffea00013ce000 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88804f380000 pfn:0x4f380 head:ffffea00013ce000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001d6e400 dead000000000002 ffff888011842000 raw: ffff88804f380000 0000000080080007 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 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3623, tgid 3623 (syz-executor.4), ts 81379099966, free_ts 8683998614 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] __kmalloc_node_track_caller+0x2cb/0x360 mm/slub.c:4950 kmalloc_reserve net/core/skbuff.c:354 [inline] pskb_expand_head+0x15e/0x1070 net/core/skbuff.c:1695 netlink_trim+0x1ea/0x240 net/netlink/af_netlink.c:1301 netlink_broadcast+0x5b/0xd60 net/netlink/af_netlink.c:1497 nlmsg_multicast include/net/netlink.h:1033 [inline] nlmsg_notify+0x8f/0x280 net/netlink/af_netlink.c:2544 rtnl_notify net/core/rtnetlink.c:767 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:3928 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:3943 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:3931 [inline] rtmsg_ifinfo+0xf0/0x120 net/core/rtnetlink.c:3949 __dev_notify_flags+0x226/0x2b0 net/core/dev.c:8565 dev_change_flags+0x112/0x170 net/core/dev.c:8607 do_setlink+0x961/0x3bb0 net/core/rtnetlink.c:2780 __rtnl_newlink+0xd6a/0x17e0 net/core/rtnetlink.c:3546 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 free_contig_range+0xb1/0x180 mm/page_alloc.c:9314 destroy_args+0xa8/0x646 mm/debug_vm_pgtable.c:1031 debug_vm_pgtable+0x2a03/0x2a94 mm/debug_vm_pgtable.c:1354 do_one_initcall+0x103/0x650 init/main.c:1295 do_initcall_level init/main.c:1368 [inline] do_initcalls init/main.c:1384 [inline] do_basic_setup init/main.c:1403 [inline] kernel_init_freeable+0x6b1/0x73a init/main.c:1610 kernel_init+0x1a/0x1d0 init/main.c:1499 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 Memory state around the buggy address: ffff88804f384000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804f384080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88804f384100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88804f384180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804f384200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================