================================================================== BUG: KASAN: slab-use-after-free in mini_qdisc_pair_swap+0x19d/0x1f0 net/sched/sch_generic.c:1568 Read of size 8 at addr ffff88802df35000 by task syz.0.594/8584 CPU: 0 UID: 0 PID: 8584 Comm: syz.0.594 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xcd/0x630 mm/kasan/report.c:482 kasan_report+0xe0/0x110 mm/kasan/report.c:595 mini_qdisc_pair_swap+0x19d/0x1f0 net/sched/sch_generic.c:1568 tcf_chain_head_change_item net/sched/cls_api.c:522 [inline] tcf_chain0_head_change_cb_del+0x1a8/0x3e0 net/sched/cls_api.c:969 tcf_block_put_ext+0xb4/0x1c0 net/sched/cls_api.c:1559 clsact_destroy+0x2c0/0x8a0 net/sched/sch_ingress.c:302 __qdisc_destroy+0x109/0x4a0 net/sched/sch_generic.c:1077 qdisc_put+0xab/0xe0 net/sched/sch_generic.c:1105 shutdown_scheduler_queue+0xa5/0x160 net/sched/sch_generic.c:1158 dev_shutdown+0x180/0x430 net/sched/sch_generic.c:1492 unregister_netdevice_many_notify+0xb37/0x2590 net/core/dev.c:12371 unregister_netdevice_many net/core/dev.c:12446 [inline] unregister_netdevice_queue net/core/dev.c:12260 [inline] unregister_netdevice_queue+0x305/0x3c0 net/core/dev.c:12250 unregister_netdevice include/linux/netdevice.h:3405 [inline] nsim_destroy+0x1a0/0x830 drivers/net/netdevsim/netdev.c:1180 __nsim_dev_port_del+0x189/0x240 drivers/net/netdevsim/dev.c:1528 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1540 [inline] nsim_dev_reload_destroy+0x10a/0x4d0 drivers/net/netdevsim/dev.c:1763 nsim_dev_reload_down+0x66/0xd0 drivers/net/netdevsim/dev.c:1038 devlink_reload+0x1a1/0x7c0 net/devlink/dev.c:461 devlink_nl_reload_doit+0x59a/0x1360 net/devlink/dev.c:584 genl_family_rcv_msg_doit+0x209/0x2f0 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x55c/0x800 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2550 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8c8/0xdd0 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0xa5d/0xc30 net/socket.c:2592 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2646 __sys_sendmsg+0x16d/0x220 net/socket.c:2678 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd37658f7c9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd37749a038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fd3767e6180 RCX: 00007fd37658f7c9 RDX: 0000000000000030 RSI: 0000200000000100 RDI: 0000000000000009 RBP: 00007fd376613f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd3767e6218 R14: 00007fd3767e6180 R15: 00007ffe0b97a638 Allocated by task 5330: kasan_save_stack+0x33/0x60 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415 kmalloc_noprof include/linux/slab.h:957 [inline] syslog_print+0xf6/0x620 kernel/printk/printk.c:1583 do_syslog+0x3dc/0x6c0 kernel/printk/printk.c:1761 __do_sys_syslog kernel/printk/printk.c:1853 [inline] __se_sys_syslog kernel/printk/printk.c:1851 [inline] __x64_sys_syslog+0x74/0xb0 kernel/printk/printk.c:1851 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5330: kasan_save_stack+0x33/0x60 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2540 [inline] slab_free mm/slub.c:6670 [inline] kfree+0x2f8/0x6e0 mm/slub.c:6878 syslog_print+0x546/0x620 kernel/printk/printk.c:1675 do_syslog+0x3dc/0x6c0 kernel/printk/printk.c:1761 __do_sys_syslog kernel/printk/printk.c:1853 [inline] __se_sys_syslog kernel/printk/printk.c:1851 [inline] __x64_sys_syslog+0x74/0xb0 kernel/printk/printk.c:1851 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88802df35000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 0 bytes inside of freed 2048-byte region [ffff88802df35000, ffff88802df35800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2df30 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801b442f00 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801b442f00 dead000000000100 dead000000000122 head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea0000b7cc01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 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, tgid 1 (swapper/0), ts 21070629597, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1857 prep_new_page mm/page_alloc.c:1865 [inline] get_page_from_freelist+0xd0b/0x31a0 mm/page_alloc.c:3915 __alloc_frozen_pages_noprof+0x25f/0x2430 mm/page_alloc.c:5210 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2486 alloc_slab_page mm/slub.c:3075 [inline] allocate_slab mm/slub.c:3248 [inline] new_slab+0x2c3/0x430 mm/slub.c:3302 ___slab_alloc+0xe18/0x1c90 mm/slub.c:4656 __slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4779 __slab_alloc_node mm/slub.c:4855 [inline] slab_alloc_node mm/slub.c:5251 [inline] __kmalloc_cache_noprof+0x485/0x800 mm/slub.c:5771 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] i2c_new_client_device+0x7a/0xed0 drivers/i2c/i2c-core-base.c:967 dvb_module_probe+0x167/0x340 drivers/media/dvb-core/dvbdev.c:1042 vidtv_bridge_probe_tuner.constprop.0+0x22d/0x320 drivers/media/test-drivers/vidtv/vidtv_bridge.c:405 vidtv_bridge_dvb_init drivers/media/test-drivers/vidtv/vidtv_bridge.c:432 [inline] vidtv_bridge_probe+0x41a/0xa90 drivers/media/test-drivers/vidtv/vidtv_bridge.c:508 platform_probe+0x106/0x1d0 drivers/base/platform.c:1446 call_driver_probe drivers/base/dd.c:581 [inline] really_probe+0x241/0xb20 drivers/base/dd.c:659 __driver_probe_device+0x1de/0x470 drivers/base/dd.c:801 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831 page_owner free stack trace missing Memory state around the buggy address: ffff88802df34f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802df34f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802df35000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802df35080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802df35100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================