================================================================== BUG: KASAN: use-after-free in __ptr_ring_peek include/linux/ptr_ring.h:172 [inline] BUG: KASAN: use-after-free in __ptr_ring_consume include/linux/ptr_ring.h:299 [inline] BUG: KASAN: use-after-free in veth_xdp_rcv+0x70b/0x810 drivers/net/veth.c:856 Read of size 8 at addr ffff888146f3f0c0 by task ksoftirqd/0/13 CPU: 0 PID: 13 Comm: ksoftirqd/0 Not tainted 5.15.0-next-20211109-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+0x8d/0x320 mm/kasan/report.c:247 __kasan_report mm/kasan/report.c:433 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:450 __ptr_ring_peek include/linux/ptr_ring.h:172 [inline] __ptr_ring_consume include/linux/ptr_ring.h:299 [inline] veth_xdp_rcv+0x70b/0x810 drivers/net/veth.c:856 veth_poll+0x134/0x850 drivers/net/veth.c:913 __napi_poll+0xaf/0x440 net/core/dev.c:7017 napi_poll net/core/dev.c:7084 [inline] net_rx_action+0x801/0xb40 net/core/dev.c:7171 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 run_ksoftirqd kernel/softirq.c:920 [inline] run_ksoftirqd+0x2d/0x60 kernel/softirq.c:912 smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 23020: kasan_save_stack+0x1e/0x50 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+0xa9/0xd0 mm/kasan/common.c:522 kmalloc_node include/linux/slab.h:613 [inline] kvmalloc_node+0x61/0x120 mm/util.c:587 kvmalloc include/linux/slab.h:741 [inline] kvmalloc_array include/linux/slab.h:759 [inline] __ptr_ring_init_queue_alloc include/linux/ptr_ring.h:471 [inline] ptr_ring_init include/linux/ptr_ring.h:489 [inline] __veth_napi_enable_range+0xa2/0x780 drivers/net/veth.c:941 __veth_napi_enable drivers/net/veth.c:964 [inline] veth_enable_xdp+0x30f/0x620 drivers/net/veth.c:1068 veth_xdp_set drivers/net/veth.c:1483 [inline] veth_xdp+0x4d4/0x780 drivers/net/veth.c:1523 dev_xdp_install+0xd5/0x270 net/core/dev.c:9384 dev_xdp_attach+0x83d/0x1010 net/core/dev.c:9532 dev_change_xdp_fd+0x246/0x300 net/core/dev.c:9772 do_setlink+0x2fb4/0x3970 net/core/rtnetlink.c:2931 rtnl_group_changelink net/core/rtnetlink.c:3242 [inline] __rtnl_newlink+0xc06/0x1750 net/core/rtnetlink.c:3396 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3506 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5571 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2491 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x86d/0xda0 net/netlink/af_netlink.c:1916 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409 ___sys_sendmsg+0xf3/0x170 net/socket.c:2463 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492 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+0x44/0xae Freed by task 23355: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xff/0x130 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:1723 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1749 slab_free mm/slub.c:3513 [inline] kfree+0xf6/0x560 mm/slub.c:4561 kvfree+0x42/0x50 mm/util.c:620 ptr_ring_cleanup include/linux/ptr_ring.h:671 [inline] veth_napi_del_range+0x3aa/0x560 drivers/net/veth.c:985 veth_napi_del drivers/net/veth.c:991 [inline] veth_disable_xdp+0x2b3/0x430 drivers/net/veth.c:1101 veth_xdp_set drivers/net/veth.c:1499 [inline] veth_xdp+0x698/0x780 drivers/net/veth.c:1523 dev_xdp_install+0x1ed/0x270 net/core/dev.c:9384 dev_xdp_attach+0x83d/0x1010 net/core/dev.c:9532 dev_change_xdp_fd+0x246/0x300 net/core/dev.c:9772 do_setlink+0x2fb4/0x3970 net/core/rtnetlink.c:2931 rtnl_group_changelink net/core/rtnetlink.c:3242 [inline] __rtnl_newlink+0xc06/0x1750 net/core/rtnetlink.c:3396 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3506 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5571 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2491 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x86d/0xda0 net/netlink/af_netlink.c:1916 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409 ___sys_sendmsg+0xf3/0x170 net/socket.c:2463 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492 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+0x44/0xae Last potentially related work creation: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 __kasan_record_aux_stack+0xf5/0x120 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:2985 [inline] call_rcu+0xb1/0x740 kernel/rcu/tree.c:3065 netlink_release+0xdd2/0x1dd0 net/netlink/af_netlink.c:815 __sock_release+0xcd/0x280 net/socket.c:649 sock_close+0x18/0x20 net/socket.c:1314 __fput+0x286/0x9f0 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae Second to last potentially related work creation: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 __kasan_record_aux_stack+0xf5/0x120 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:2985 [inline] call_rcu+0xb1/0x740 kernel/rcu/tree.c:3065 netlink_release+0xdd2/0x1dd0 net/netlink/af_netlink.c:815 __sock_release+0xcd/0x280 net/socket.c:649 sock_close+0x18/0x20 net/socket.c:1314 __fput+0x286/0x9f0 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff888146f3f000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 192 bytes inside of 2048-byte region [ffff888146f3f000, ffff888146f3f800) The buggy address belongs to the page: page:ffffea00051bce00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x146f38 head:ffffea00051bce00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x57ff00000010200(slab|head|node=1|zone=2|lastcpupid=0x7ff) raw: 057ff00000010200 ffffea0005353a00 dead000000000002 ffff888010c42000 raw: 0000000000000000 0000000000080008 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 7892909621, free_ts 0 prep_new_page mm/page_alloc.c:2418 [inline] get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4149 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5369 alloc_page_interleave+0x1e/0x200 mm/mempolicy.c:2036 alloc_pages+0x29f/0x300 mm/mempolicy.c:2186 alloc_slab_page mm/slub.c:1793 [inline] allocate_slab mm/slub.c:1930 [inline] new_slab+0x32d/0x4a0 mm/slub.c:1993 ___slab_alloc+0x918/0xfe0 mm/slub.c:3022 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3109 slab_alloc_node mm/slub.c:3200 [inline] slab_alloc mm/slub.c:3242 [inline] kmem_cache_alloc_trace+0x289/0x2c0 mm/slub.c:3259 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:724 [inline] device_create_groups_vargs+0x8a/0x280 drivers/base/core.c:4034 device_create+0xdf/0x120 drivers/base/core.c:4094 bdi_register_va.part.0+0x9c/0x800 mm/backing-dev.c:881 bdi_register_va mm/backing-dev.c:916 [inline] bdi_register+0x12a/0x140 mm/backing-dev.c:913 device_add_disk+0x88c/0xef0 block/genhd.c:501 add_disk include/linux/genhd.h:212 [inline] loop_add+0x762/0x9b0 drivers/block/loop.c:2052 loop_init+0x1f4/0x216 drivers/block/loop.c:2255 do_one_initcall+0x103/0x650 init/main.c:1303 page_owner free stack trace missing Memory state around the buggy address: ffff888146f3ef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888146f3f000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888146f3f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888146f3f100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888146f3f180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================