syzbot

erspan0 speed is unknown, defaulting to 1000
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BUG: KASAN: use-after-free in siw_query_port+0x342/0x430 drivers/infiniband/sw/siw/siw_verbs.c:177
Read of size 4 at addr ffff8880197220e0 by task kworker/0:18/14655

CPU: 0 PID: 14655 Comm: kworker/0:18 Not tainted 6.1.90-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: infiniband ib_cache_event_task
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x15f/0x4f0 mm/kasan/report.c:395
 kasan_report+0x136/0x160 mm/kasan/report.c:495
 siw_query_port+0x342/0x430 drivers/infiniband/sw/siw/siw_verbs.c:177
 ib_cache_update+0x1a8/0xaf0 drivers/infiniband/core/cache.c:1487
 ib_cache_event_task+0xef/0x1e0 drivers/infiniband/core/cache.c:1561
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>

Allocated by task 5992:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:955 [inline]
 __kmalloc_node+0xb3/0x230 mm/slab_common.c:962
 kmalloc_node include/linux/slab.h:582 [inline]
 kvmalloc_node+0x6e/0x180 mm/util.c:581
 kvmalloc include/linux/slab.h:709 [inline]
 kvzalloc include/linux/slab.h:717 [inline]
 alloc_netdev_mqs+0x85/0xeb0 net/core/dev.c:10622
 __ip_tunnel_create+0x205/0x370 net/ipv4/ip_tunnel.c:254
 ip_tunnel_init_net+0x21f/0x700 net/ipv4/ip_tunnel.c:1100
 ops_init+0x356/0x600 net/core/net_namespace.c:135
 setup_net+0x4b5/0xb90 net/core/net_namespace.c:332
 copy_net_ns+0x395/0x5d0 net/core/net_namespace.c:478
 create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x11e/0x170 kernel/nsproxy.c:226
 ksys_unshare+0x580/0xb20 kernel/fork.c:3203
 __do_sys_unshare kernel/fork.c:3274 [inline]
 __se_sys_unshare kernel/fork.c:3272 [inline]
 __x64_sys_unshare+0x34/0x40 kernel/fork.c:3272
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Freed by task 5616:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516
 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1724 [inline]
 slab_free_freelist_hook mm/slub.c:1750 [inline]
 slab_free mm/slub.c:3661 [inline]
 __kmem_cache_free+0x25c/0x3c0 mm/slub.c:3674
 device_release+0x91/0x1c0
 kobject_cleanup lib/kobject.c:681 [inline]
 kobject_release lib/kobject.c:712 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x224/0x460 lib/kobject.c:729
 netdev_run_todo+0xe56/0xf40 net/core/dev.c:10412
 ip_tunnel_delete_nets+0x2f2/0x330 net/ipv4/ip_tunnel.c:1154
 ops_exit_list net/core/net_namespace.c:174 [inline]
 cleanup_net+0x763/0xb60 net/core/net_namespace.c:601
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

The buggy address belongs to the object at ffff888019722000
 which belongs to the cache kmalloc-cg-4k of size 4096
The buggy address is located 224 bytes inside of
 4096-byte region [ffff888019722000, ffff888019723000)

The buggy address belongs to the physical page:
page:ffffea000065c800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x19720
head:ffffea000065c800 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88807f8fb041
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff88801244c280
raw: 0000000000000000 0000000000040004 00000001ffffffff ffff88807f8fb041
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 3564, tgid 3564 (syz-executor.1), ts 57825172844, free_ts 57794641888
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2513
 prep_new_page mm/page_alloc.c:2520 [inline]
 get_page_from_freelist+0x31a1/0x3320 mm/page_alloc.c:4279
 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5547
 alloc_slab_page+0x6a/0x150 mm/slub.c:1794
 allocate_slab mm/slub.c:1939 [inline]
 new_slab+0x84/0x2d0 mm/slub.c:1992
 ___slab_alloc+0xc20/0x1270 mm/slub.c:3180
 __slab_alloc mm/slub.c:3279 [inline]
 slab_alloc_node mm/slub.c:3364 [inline]
 __kmem_cache_alloc_node+0x19f/0x260 mm/slub.c:3437
 __do_kmalloc_node mm/slab_common.c:954 [inline]
 __kmalloc_node_track_caller+0xa0/0x220 mm/slab_common.c:975
 kmemdup+0x26/0x60 mm/util.c:129
 __devinet_sysctl_register+0xac/0x2a0 net/ipv4/devinet.c:2587
 devinet_sysctl_register+0x13a/0x1a0 net/ipv4/devinet.c:2639
 inetdev_init+0x291/0x4c0 net/ipv4/devinet.c:279
 inetdev_event+0x29b/0x1490 net/ipv4/devinet.c:1534
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:455
 call_netdevice_notifiers_info net/core/dev.c:1970 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2008 [inline]
 call_netdevice_notifiers+0x145/0x1b0 net/core/dev.c:2022
 register_netdevice+0x12f2/0x1720 net/core/dev.c:10132
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1440 [inline]
 free_pcp_prepare mm/page_alloc.c:1490 [inline]
 free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3358
 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3453
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x156/0x170 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:305
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737
 slab_alloc_node mm/slub.c:3398 [inline]
 __kmem_cache_alloc_node+0x137/0x260 mm/slub.c:3437
 __do_kmalloc_node mm/slab_common.c:954 [inline]
 __kmalloc+0xa1/0x230 mm/slab_common.c:968
 kmalloc include/linux/slab.h:561 [inline]
 kzalloc include/linux/slab.h:692 [inline]
 fib6_info_alloc+0x2c/0xd0 net/ipv6/ip6_fib.c:156
 ip6_route_info_create+0x446/0x12c0 net/ipv6/route.c:3750
 ip6_route_add+0x22/0x120 net/ipv6/route.c:3844
 addrconf_prefix_route net/ipv6/addrconf.c:2442 [inline]
 add_v4_addrs+0xb51/0x1180 net/ipv6/addrconf.c:3195
 addrconf_gre_config net/ipv6/addrconf.c:3469 [inline]
 addrconf_init_auto_addrs+0x1ff/0xe60 net/ipv6/addrconf.c:3487
 addrconf_notify+0xade/0xf60 net/ipv6/addrconf.c:3668
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:455
 __dev_notify_flags+0x304/0x610

Memory state around the buggy address:
 ffff888019721f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888019722000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888019722080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff888019722100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888019722180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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