syzbot

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BUG: KASAN: slab-use-after-free in rtl8150_start_xmit+0x71f/0x760 drivers/net/usb/rtl8150.c:712
Read of size 4 at addr ffff888114d3e6b0 by task kworker/u8:0/8823

CPU: 1 UID: 0 PID: 8823 Comm: kworker/u8:0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x13d/0x4b0 mm/kasan/report.c:482
 kasan_report+0xdf/0x1d0 mm/kasan/report.c:595
 rtl8150_start_xmit+0x71f/0x760 drivers/net/usb/rtl8150.c:712
 __netdev_start_xmit include/linux/netdevice.h:5343 [inline]
 netdev_start_xmit include/linux/netdevice.h:5352 [inline]
 xmit_one net/core/dev.c:3888 [inline]
 dev_hard_start_xmit+0x128/0x7a0 net/core/dev.c:3904
 sch_direct_xmit+0x194/0x890 net/sched/sch_generic.c:372
 __dev_xmit_skb net/core/dev.c:4209 [inline]
 __dev_queue_xmit+0x278a/0x4930 net/core/dev.c:4831
 dev_queue_xmit include/linux/netdevice.h:3401 [inline]
 neigh_resolve_output net/core/neighbour.c:1619 [inline]
 neigh_resolve_output+0x51d/0x8f0 net/core/neighbour.c:1599
 neigh_output include/net/neighbour.h:556 [inline]
 ip6_finish_output2+0xa92/0x1f20 net/ipv6/ip6_output.c:136
 __ip6_finish_output+0x359/0xd10 net/ipv6/ip6_output.c:208
 ip6_finish_output net/ipv6/ip6_output.c:219 [inline]
 NF_HOOK_COND include/linux/netfilter.h:307 [inline]
 ip6_output+0x2a1/0xa50 net/ipv6/ip6_output.c:246
 dst_output include/net/dst.h:470 [inline]
 NF_HOOK.constprop.0+0x115/0x5a0 include/linux/netfilter.h:318
 ndisc_send_skb+0x9fe/0x16d0 net/ipv6/ndisc.c:512
 ndisc_send_ns+0xc6/0x140 net/ipv6/ndisc.c:671
 addrconf_dad_work+0xc9c/0x10e0 net/ipv6/addrconf.c:4294
 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302
 process_scheduled_works kernel/workqueue.c:3385 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x69a/0xc80 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 8823:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x6e/0x70 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4569 [inline]
 slab_alloc_node mm/slub.c:4898 [inline]
 kmem_cache_alloc_node_noprof+0x26b/0x6b0 mm/slub.c:4950
 __alloc_skb+0x140/0x710 net/core/skbuff.c:702
 alloc_skb include/linux/skbuff.h:1383 [inline]
 ndisc_alloc_skb+0xd8/0x530 net/ipv6/ndisc.c:420
 ndisc_ns_create+0x155/0x7a0 net/ipv6/ndisc.c:626
 ndisc_send_ns+0xa9/0x140 net/ipv6/ndisc.c:668
 addrconf_dad_work+0xc9c/0x10e0 net/ipv6/addrconf.c:4294
 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302
 process_scheduled_works kernel/workqueue.c:3385 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x69a/0xc80 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Freed by task 14:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_mempool_poison_object+0x91/0x150 mm/kasan/common.c:539
 kasan_mempool_poison_object include/linux/kasan.h:363 [inline]
 napi_skb_cache_put+0x68/0x740 net/core/skbuff.c:1459
 net_tx_action+0x2b0/0xf90 net/core/dev.c:5807
 handle_softirqs+0x1dd/0x9e0 kernel/softirq.c:622
 run_ksoftirqd kernel/softirq.c:1076 [inline]
 run_ksoftirqd+0x38/0x60 kernel/softirq.c:1068
 smpboot_thread_fn+0x3d3/0xaa0 kernel/smpboot.c:160
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x69a/0xc80 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff888114d3e640
 which belongs to the cache skbuff_head_cache of size 232
The buggy address is located 112 bytes inside of
 freed 232-byte region [ffff888114d3e640, ffff888114d3e728)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x114d3e
flags: 0x200000000000000(node=0|zone=2)
page_type: f5(slab)
raw: 0200000000000000 ffff888102e8c8c0 dead000000000100 dead000000000122
raw: 0000000000000000 00000008000c000c 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5193, tgid 5193 (udevd), ts 117180693099, free_ts 117174732388
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x153/0x170 mm/page_alloc.c:1858
 prep_new_page mm/page_alloc.c:1866 [inline]
 get_page_from_freelist+0xf34/0x3a90 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x273/0x28a0 mm/page_alloc.c:5226
 alloc_slab_page mm/slub.c:3278 [inline]
 allocate_slab mm/slub.c:3467 [inline]
 new_slab+0xa6/0x6b0 mm/slub.c:3525
 refill_objects+0x277/0x420 mm/slub.c:7251
 refill_sheaf mm/slub.c:2816 [inline]
 __pcs_replace_empty_main+0x375/0x650 mm/slub.c:4651
 alloc_from_pcs mm/slub.c:4749 [inline]
 slab_alloc_node mm/slub.c:4883 [inline]
 kmem_cache_alloc_noprof+0x520/0x6a0 mm/slub.c:4905
 skb_clone+0x190/0x400 net/core/skbuff.c:2107
 do_one_broadcast net/netlink/af_netlink.c:1455 [inline]
 netlink_broadcast_filtered+0xab0/0xe90 net/netlink/af_netlink.c:1533
 netlink_broadcast net/netlink/af_netlink.c:1557 [inline]
 netlink_sendmsg+0xa16/0xda0 net/netlink/af_netlink.c:1892
 sock_sendmsg_nosec net/socket.c:787 [inline]
 __sock_sendmsg net/socket.c:802 [inline]
 ____sys_sendmsg+0x9e1/0xb70 net/socket.c:2698
 ___sys_sendmsg+0x190/0x1e0 net/socket.c:2752
 __sys_sendmsg+0x170/0x220 net/socket.c:2784
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x10b/0x7f0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 2860 tgid 2860 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1402 [inline]
 __free_frozen_pages+0x692/0xf10 mm/page_alloc.c:2943
 selinux_genfs_get_sid security/selinux/hooks.c:1364 [inline]
 inode_doinit_with_dentry+0x99d/0x1320 security/selinux/hooks.c:1563
 selinux_d_instantiate+0x26/0x40 security/selinux/hooks.c:6662
 security_d_instantiate+0x62/0xc0 security/security.c:3704
 d_splice_alias_ops+0xd7/0x1320 fs/dcache.c:3141
 kernfs_iop_lookup+0x23f/0x2d0 fs/kernfs/dir.c:1289
 lookup_open.isra.0+0x631/0x11b0 fs/namei.c:4484
 open_last_lookups fs/namei.c:4611 [inline]
 path_openat+0xa98/0x31a0 fs/namei.c:4855
 do_file_open+0x20e/0x430 fs/namei.c:4887
 do_sys_openat2+0x10d/0x1e0 fs/open.c:1364
 do_sys_open fs/open.c:1370 [inline]
 __do_sys_openat fs/open.c:1386 [inline]
 __se_sys_openat fs/open.c:1381 [inline]
 __x64_sys_openat+0x12d/0x210 fs/open.c:1381
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x10b/0x7f0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888114d3e580: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
 ffff888114d3e600: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
>ffff888114d3e680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff888114d3e700: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc
 ffff888114d3e780: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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