================================================================== 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 ffff8880214a60f8 by task ksoftirqd/1/19 CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.15.0-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+0x6c/0x309 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 __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 913: kasan_save_stack+0x1b/0x40 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+0xa4/0xd0 mm/kasan/common.c:522 kmalloc_node include/linux/slab.h:614 [inline] kvmalloc_node+0x61/0x120 mm/util.c:587 kvmalloc include/linux/mm.h:800 [inline] kvmalloc_array include/linux/mm.h:818 [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_xdp_attach_link net/core/dev.c:9551 [inline] bpf_xdp_link_attach+0x262/0x410 net/core/dev.c:9714 link_create kernel/bpf/syscall.c:4289 [inline] __sys_bpf+0x5640/0x5f00 kernel/bpf/syscall.c:4688 __do_sys_bpf kernel/bpf/syscall.c:4722 [inline] __se_sys_bpf kernel/bpf/syscall.c:4720 [inline] __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4720 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 913: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360 ____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:1700 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1726 slab_free mm/slub.c:3492 [inline] kfree+0xf3/0x550 mm/slub.c:4552 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_detach_link net/core/dev.c:9568 [inline] bpf_xdp_link_release+0x242/0x4e0 net/core/dev.c:9583 bpf_link_free+0xe6/0x1b0 kernel/bpf/syscall.c:2447 bpf_link_put+0x161/0x1b0 kernel/bpf/syscall.c:2473 bpf_link_release+0x33/0x40 kernel/bpf/syscall.c:2481 __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 ffff8880214a6000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 248 bytes inside of 2048-byte region [ffff8880214a6000, ffff8880214a6800) The buggy address belongs to the page: page:ffffea0000852800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x214a0 head:ffffea0000852800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 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 894, ts 3275135137852, free_ts 3275058897413 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4155 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5381 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2191 alloc_slab_page mm/slub.c:1770 [inline] allocate_slab mm/slub.c:1907 [inline] new_slab+0x319/0x490 mm/slub.c:1970 ___slab_alloc+0x921/0xfe0 mm/slub.c:3001 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3088 slab_alloc_node mm/slub.c:3179 [inline] slab_alloc mm/slub.c:3221 [inline] __kmalloc+0x303/0x320 mm/slub.c:4396 kmalloc include/linux/slab.h:596 [inline] sk_prot_alloc+0x110/0x290 net/core/sock.c:1920 sk_alloc+0x30/0xa60 net/core/sock.c:1973 __netlink_create+0x63/0x2f0 net/netlink/af_netlink.c:643 netlink_create+0x3ad/0x5e0 net/netlink/af_netlink.c:706 __sock_create+0x353/0x790 net/socket.c:1464 sock_create net/socket.c:1515 [inline] __sys_socket+0xef/0x200 net/socket.c:1557 __do_sys_socket net/socket.c:1566 [inline] __se_sys_socket net/socket.c:1564 [inline] __x64_sys_socket+0x6f/0xb0 net/socket.c:1564 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 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare+0x326/0x810 mm/page_alloc.c:1391 free_unref_page_prepare mm/page_alloc.c:3317 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3396 __unfreeze_partials+0x340/0x360 mm/slub.c:2502 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x95/0xb0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:259 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3213 [inline] slab_alloc mm/slub.c:3221 [inline] kmem_cache_alloc+0x209/0x390 mm/slub.c:3226 kmem_cache_zalloc include/linux/slab.h:711 [inline] __kernfs_new_node+0xd4/0x8b0 fs/kernfs/dir.c:585 kernfs_new_node+0x93/0x120 fs/kernfs/dir.c:647 __kernfs_create_file+0x51/0x350 fs/kernfs/file.c:985 sysfs_add_file_mode_ns+0x226/0x540 fs/sysfs/file.c:317 create_files fs/sysfs/group.c:64 [inline] internal_create_group+0x328/0xb20 fs/sysfs/group.c:149 internal_create_groups.part.0+0x90/0x140 fs/sysfs/group.c:189 internal_create_groups fs/sysfs/group.c:185 [inline] sysfs_create_groups+0x25/0x50 fs/sysfs/group.c:215 device_add_groups drivers/base/core.c:2475 [inline] device_add_attrs drivers/base/core.c:2623 [inline] device_add+0x81f/0x1ee0 drivers/base/core.c:3347 netdev_register_kobject+0x181/0x430 net/core/net-sysfs.c:2010 Memory state around the buggy address: ffff8880214a5f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880214a6000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880214a6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880214a6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880214a6180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================