smc: removing ib device syz2 smbdirect: ib_dev[syz2] removed ================================================================== BUG: KASAN: slab-use-after-free in kobject_uevent_net_broadcast+0x12c/0x560 lib/kobject_uevent.c:415 Read of size 8 at addr ffff8880774b0010 by task syz.6.231/7442 CPU: 1 UID: 0 PID: 7442 Comm: syz.6.231 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_re print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 kobject_uevent_net_broadcast+0x12c/0x560 lib/kobject_uevent.c:415 kobject_uevent_env+0x566/0x9e0 lib/kobject_uevent.c:611 device_del+0x74d/0x8f0 drivers/base/core.c:3983 remove_one_compat_dev drivers/infiniband/core/device.c:1036 [inline] remove_compat_devs drivers/infiniband/core/device.c:1047 [inline] disable_device+0x248/0x330 drivers/infiniband/core/device.c:1339 __ib_unregister_device+0x2c9/0x400 drivers/infiniband/core/device.c:1571 ib_unregister_device_and_put+0xb8/0xf0 drivers/infiniband/core/device.c:1636 nldev_dellink+0x39c/0x430 drivers/infiniband/core/nldev.c:1902 rdma_nl_rcv_msg drivers/infiniband/core/netlink.c:-1 [inline] rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline] rdma_nl_rcv+0x6ef/0xa40 drivers/infiniband/core/netlink.c:259 netlink_unicast_kernel net/netlink/af_netlink.c:1338 [inline] netlink_unicast+0x7bd/0x940 net/netlink/af_netlink.c:1364 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:800 __sock_sendmsg net/socket.c:815 [inline] ____sys_sendmsg+0x54e/0x850 net/socket.c:2713 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2767 __sys_sendmsg net/socket.c:2799 [inline] __do_sys_sendmsg net/socket.c:2804 [inline] __se_sys_sendmsg net/socket.c:2802 [inline] __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2802 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb934f9e1d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb935ee4028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fb935226090 RCX: 00007fb934f9e1d9 RDX: 0000000000000000 RSI: 0000200000000780 RDI: 0000000000000009 RBP: 00007fb935035888 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb935226128 R14: 00007fb935226090 R15: 00007ffcd2aed968 Allocated by task 7388: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x321/0x600 mm/slub.c:5563 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] uevent_net_init+0xdb/0x2d0 lib/kobject_uevent.c:782 ops_init+0x35d/0x5d0 net/core/net_namespace.c:137 setup_net+0x118/0x350 net/core/net_namespace.c:443 copy_net_ns+0x53b/0x780 net/core/net_namespace.c:582 create_new_namespaces+0x3f0/0x6b0 kernel/nsproxy.c:132 copy_namespaces+0x432/0x4b0 kernel/nsproxy.c:195 copy_process+0x1ec4/0x4400 kernel/fork.c:2314 kernel_clone+0x2d7/0x940 kernel/fork.c:2771 __do_sys_clone kernel/fork.c:2913 [inline] __se_sys_clone kernel/fork.c:2897 [inline] __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2897 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 7388: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:264 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:296 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2748 [inline] slab_free mm/slub.c:6509 [inline] kfree+0x1c5/0x650 mm/slub.c:6802 ops_exit_list net/core/net_namespace.c:200 [inline] ops_undo_list+0x43d/0x8d0 net/core/net_namespace.c:253 setup_net+0x2f6/0x350 net/core/net_namespace.c:459 copy_net_ns+0x53b/0x780 net/core/net_namespace.c:582 create_new_namespaces+0x3f0/0x6b0 kernel/nsproxy.c:132 copy_namespaces+0x432/0x4b0 kernel/nsproxy.c:195 copy_process+0x1ec4/0x4400 kernel/fork.c:2314 kernel_clone+0x2d7/0x940 kernel/fork.c:2771 __do_sys_clone kernel/fork.c:2913 [inline] __se_sys_clone kernel/fork.c:2897 [inline] __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2897 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880774b0000 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 16 bytes inside of freed 32-byte region [ffff8880774b0000, ffff8880774b0020) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880774b0ac0 pfn:0x774b0 flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000200 ffff88801c041780 ffffea0000d58710 ffffea00009d74d0 raw: ffff8880774b0ac0 000000000040003a 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 0xd2800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5116, tgid 5116 (v4l_id), ts 45040998932 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436 alloc_slab_page mm/slub.c:3347 [inline] allocate_slab+0x7d/0x620 mm/slub.c:3462 new_slab mm/slub.c:3513 [inline] refill_objects+0x2d5/0x350 mm/slub.c:7418 refill_sheaf mm/slub.c:2885 [inline] __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4774 alloc_from_pcs mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:4984 [inline] __kmalloc_cache_noprof+0x39b/0x600 mm/slub.c:5559 _kmalloc_noprof include/linux/slab.h:991 [inline] slab_free_hook mm/slub.c:2700 [inline] slab_free mm/slub.c:6509 [inline] kmem_cache_free+0x156/0x650 mm/slub.c:6636 anon_vma_free mm/rmap.c:137 [inline] __put_anon_vma+0x12b/0x2d0 mm/rmap.c:2974 put_anon_vma mm/internal.h:290 [inline] unlink_anon_vmas+0x544/0x720 mm/rmap.c:540 free_pgtables+0x836/0xb70 mm/memory.c:414 exit_mmap+0x4aa/0x9f0 mm/mmap.c:1327 __mmput+0x118/0x420 kernel/fork.c:1193 exit_mm+0x18e/0x240 kernel/exit.c:592 do_exit+0x6cd/0x2360 kernel/exit.c:974 do_group_exit+0x22d/0x2f0 kernel/exit.c:1129 page last free pid 15 tgid 15 ts 45012111025 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962 __tlb_remove_table_free mm/mmu_gather.c:228 [inline] tlb_remove_table_rcu+0x85/0x100 mm/mmu_gather.c:291 rcu_do_batch kernel/rcu/tree.c:2650 [inline] rcu_core+0x926/0x1260 kernel/rcu/tree.c:2919 handle_softirqs+0x226/0x860 kernel/softirq.c:645 run_ksoftirqd+0x36/0x60 kernel/softirq.c:1099 smpboot_thread_fn+0x565/0xa70 kernel/smpboot.c:160 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff8880774aff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880774aff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880774b0000: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ^ ffff8880774b0080: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc ffff8880774b0100: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ==================================================================