================================================================== BUG: KASAN: slab-out-of-bounds in csum_partial_copy_nocheck include/net/checksum.h:53 [inline] BUG: KASAN: slab-out-of-bounds in skb_copy_and_csum_bits+0x433/0x9c0 net/core/skbuff.c:3620 Write of size 1284 at addr ffff88807aa715e0 by task syz.2.134/6657 CPU: 1 UID: 0 PID: 6657 Comm: syz.2.134 Not tainted 6.12.0-rc5-next-20241030-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106 csum_partial_copy_nocheck include/net/checksum.h:53 [inline] skb_copy_and_csum_bits+0x433/0x9c0 net/core/skbuff.c:3620 __ip6_append_data+0x3075/0x4380 net/ipv6/ip6_output.c:1691 ip6_append_data+0x264/0x3a0 net/ipv6/ip6_output.c:1852 l2tp_ip6_sendmsg+0x17a5/0x2020 net/l2tp/l2tp_ip6.c:660 sock_sendmsg_nosec net/socket.c:729 [inline] __sock_sendmsg+0x1a6/0x270 net/socket.c:744 sock_sendmsg+0x134/0x200 net/socket.c:767 splice_to_socket+0xa10/0x10b0 fs/splice.c:889 do_splice_from fs/splice.c:941 [inline] do_splice+0xd68/0x18e0 fs/splice.c:1354 __do_splice fs/splice.c:1436 [inline] __do_sys_splice fs/splice.c:1652 [inline] __se_sys_splice+0x331/0x4a0 fs/splice.c:1634 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc71f77e719 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc71dbd5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007fc71f936130 RCX: 00007fc71f77e719 RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007fc71f7f132e R08: 0000000000008004 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007fc71f936130 R15: 00007ffee2c9cfa8 Allocated by task 6657: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4104 [inline] slab_alloc_node mm/slub.c:4153 [inline] kmem_cache_alloc_node_noprof+0x1d9/0x380 mm/slub.c:4205 kmalloc_reserve+0xa8/0x2a0 net/core/skbuff.c:587 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:678 alloc_skb include/linux/skbuff.h:1322 [inline] __ip6_append_data+0x2e49/0x4380 net/ipv6/ip6_output.c:1665 ip6_append_data+0x264/0x3a0 net/ipv6/ip6_output.c:1852 l2tp_ip6_sendmsg+0x17a5/0x2020 net/l2tp/l2tp_ip6.c:660 sock_sendmsg_nosec net/socket.c:729 [inline] __sock_sendmsg+0x1a6/0x270 net/socket.c:744 sock_sendmsg+0x134/0x200 net/socket.c:767 splice_to_socket+0xa10/0x10b0 fs/splice.c:889 do_splice_from fs/splice.c:941 [inline] do_splice+0xd68/0x18e0 fs/splice.c:1354 __do_splice fs/splice.c:1436 [inline] __do_sys_splice fs/splice.c:1652 [inline] __se_sys_splice+0x331/0x4a0 fs/splice.c:1634 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88807aa71500 which belongs to the cache skbuff_small_head of size 640 The buggy address is located 224 bytes inside of allocated 640-byte region [ffff88807aa71500, ffff88807aa71780) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7aa70 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff888141aa0a00 ffffea0000a6ed00 dead000000000002 raw: 0000000000000000 0000000080150015 00000001f5000000 0000000000000000 head: 00fff00000000040 ffff888141aa0a00 ffffea0000a6ed00 dead000000000002 head: 0000000000000000 0000000080150015 00000001f5000000 0000000000000000 head: 00fff00000000002 ffffea0001ea9c01 ffffffffffffffff 0000000000000000 head: 0000000000000004 0000000000000000 00000000ffffffff 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 5853, tgid 5853 (syz-executor), ts 77207083586, free_ts 77096343776 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1541 prep_new_page mm/page_alloc.c:1549 [inline] get_page_from_freelist+0x3725/0x3870 mm/page_alloc.c:3495 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4771 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 alloc_slab_page+0x6a/0x140 mm/slub.c:2408 allocate_slab+0x5a/0x2f0 mm/slub.c:2574 new_slab mm/slub.c:2627 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3815 __slab_alloc+0x58/0xa0 mm/slub.c:3905 __slab_alloc_node mm/slub.c:3980 [inline] slab_alloc_node mm/slub.c:4141 [inline] kmem_cache_alloc_node_noprof+0x269/0x380 mm/slub.c:4205 kmalloc_reserve+0xa8/0x2a0 net/core/skbuff.c:587 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:678 alloc_skb include/linux/skbuff.h:1322 [inline] alloc_uevent_skb+0x74/0x230 lib/kobject_uevent.c:289 uevent_net_broadcast_tagged lib/kobject_uevent.c:352 [inline] kobject_uevent_net_broadcast+0x182/0x580 lib/kobject_uevent.c:413 kobject_uevent_env+0x57d/0x8e0 lib/kobject_uevent.c:608 device_add+0x63b/0xbf0 drivers/base/core.c:3653 netdev_register_kobject+0x17e/0x310 net/core/net-sysfs.c:2139 page last free pid 5853 tgid 5853 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1112 [inline] free_unref_page+0xcfb/0xf20 mm/page_alloc.c:2678 __slab_free+0x31b/0x3d0 mm/slub.c:4509 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4104 [inline] slab_alloc_node mm/slub.c:4153 [inline] __kmalloc_cache_noprof+0x1d9/0x390 mm/slub.c:4309 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] ref_tracker_alloc+0x14b/0x490 lib/ref_tracker.c:203 register_netdevice+0x150b/0x1b00 net/core/dev.c:10570 geneve_configure+0x6dd/0xa60 drivers/net/geneve.c:1383 geneve_newlink+0x109/0x1b0 drivers/net/geneve.c:1634 rtnl_newlink_create+0x2df/0xa30 net/core/rtnetlink.c:3703 __rtnl_newlink net/core/rtnetlink.c:3789 [inline] rtnl_newlink+0xfa9/0x1550 net/core/rtnetlink.c:3885 rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6797 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2551 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901 Memory state around the buggy address: ffff88807aa71680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807aa71700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88807aa71780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88807aa71800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807aa71880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================