================================================================== BUG: KASAN: use-after-free in driver_find drivers/base/driver.c:293 [inline] BUG: KASAN: use-after-free in driver_register+0x352/0x3a0 drivers/base/driver.c:233 Read of size 8 at addr ffff88807ea14ac8 by task syz-executor.4/18150 CPU: 0 PID: 18150 Comm: syz-executor.4 Not tainted 5.19.0-rc3-syzkaller-00146-g92f20ff72066 #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+0xeb/0x495 mm/kasan/report.c:313 print_report mm/kasan/report.c:429 [inline] kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491 driver_find drivers/base/driver.c:293 [inline] driver_register+0x352/0x3a0 drivers/base/driver.c:233 usb_gadget_register_driver_owner+0xfb/0x1e0 drivers/usb/gadget/udc/core.c:1558 raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:515 [inline] raw_ioctl+0x188d/0x2730 drivers/usb/gadget/legacy/raw_gadget.c:1222 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 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+0x46/0xb0 RIP: 0033:0x7f2a6fa88ec7 Code: 3c 1c 48 f7 d8 49 39 c4 72 b8 e8 34 54 02 00 85 c0 78 bd 48 83 c4 08 4c 89 e0 5b 41 5c c3 0f 1f 44 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2a70b5e098 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f2a70b5f110 RCX: 00007f2a6fa88ec7 RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000006 RBP: 0000000000000006 R08: 000000000000ffff R09: 000000000000000b R10: 00007f2a70b5e140 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000020000b40 R14: 0000000020000240 R15: 0000000000000000 Allocated by task 18134: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] bus_add_driver+0xd4/0x640 drivers/base/bus.c:602 driver_register+0x220/0x3a0 drivers/base/driver.c:240 usb_gadget_register_driver_owner+0xfb/0x1e0 drivers/usb/gadget/udc/core.c:1558 raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:515 [inline] raw_ioctl+0x188d/0x2730 drivers/usb/gadget/legacy/raw_gadget.c:1222 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 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+0x46/0xb0 Freed by task 18150: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1754 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1780 slab_free mm/slub.c:3536 [inline] kfree+0xd6/0x4d0 mm/slub.c:4584 kobject_cleanup lib/kobject.c:673 [inline] kobject_release lib/kobject.c:704 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x540 lib/kobject.c:721 driver_find drivers/base/driver.c:291 [inline] driver_register+0x1e3/0x3a0 drivers/base/driver.c:233 usb_gadget_register_driver_owner+0xfb/0x1e0 drivers/usb/gadget/udc/core.c:1558 raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:515 [inline] raw_ioctl+0x188d/0x2730 drivers/usb/gadget/legacy/raw_gadget.c:1222 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 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+0x46/0xb0 Last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 kvfree_call_rcu+0x74/0x990 kernel/rcu/tree.c:3647 br_multicast_destroy_mdb_entry+0x86/0xb0 net/bridge/br_multicast.c:609 br_multicast_gc.isra.0+0xca/0x110 net/bridge/br_multicast.c:775 br_multicast_gc_work+0xe5/0x130 net/bridge/br_multicast.c:3850 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 The buggy address belongs to the object at ffff88807ea14a00 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 200 bytes inside of 256-byte region [ffff88807ea14a00, ffff88807ea14b00) The buggy address belongs to the physical page: page:ffffea0001fa8500 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7ea14 head:ffffea0001fa8500 order:1 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001ddaf00 dead000000000003 ffff888011841b40 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3633, tgid 3633 (syz-executor.0), ts 57954645079, free_ts 57893747232 prep_new_page mm/page_alloc.c:2456 [inline] get_page_from_freelist+0x1290/0x3b70 mm/page_alloc.c:4198 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5426 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2272 alloc_slab_page mm/slub.c:1824 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1969 new_slab mm/slub.c:2029 [inline] ___slab_alloc+0x9c4/0xe20 mm/slub.c:3031 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3118 slab_alloc_node mm/slub.c:3209 [inline] slab_alloc mm/slub.c:3251 [inline] kmem_cache_alloc_trace+0x310/0x3f0 mm/slub.c:3282 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] ____ip_mc_inc_group+0x244/0xc70 net/ipv4/igmp.c:1442 __ip_mc_inc_group net/ipv4/igmp.c:1477 [inline] ip_mc_inc_group net/ipv4/igmp.c:1483 [inline] ip_mc_up+0x14b/0x360 net/ipv4/igmp.c:1782 inetdev_event+0x2e8/0x15d0 net/ipv4/devinet.c:1577 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1945 call_netdevice_notifiers_extack net/core/dev.c:1983 [inline] call_netdevice_notifiers net/core/dev.c:1997 [inline] __dev_notify_flags+0x110/0x2b0 net/core/dev.c:8571 dev_change_flags+0x112/0x170 net/core/dev.c:8609 do_setlink+0x961/0x3bb0 net/core/rtnetlink.c:2780 __rtnl_newlink+0xd6a/0x17e0 net/core/rtnetlink.c:3546 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1371 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1421 free_unref_page_prepare mm/page_alloc.c:3343 [inline] free_unref_page+0x19/0x6a0 mm/page_alloc.c:3438 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:750 [inline] slab_alloc_node mm/slub.c:3243 [inline] kmem_cache_alloc_node+0x255/0x3f0 mm/slub.c:3293 __alloc_skb+0x215/0x340 net/core/skbuff.c:414 alloc_skb include/linux/skbuff.h:1426 [inline] netlink_alloc_large_skb net/netlink/af_netlink.c:1191 [inline] netlink_sendmsg+0x9a2/0xe10 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 __sys_sendto+0x21a/0x320 net/socket.c:2119 __do_sys_sendto net/socket.c:2131 [inline] __se_sys_sendto net/socket.c:2127 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2127 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+0x46/0xb0 Memory state around the buggy address: ffff88807ea14980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807ea14a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807ea14a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807ea14b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807ea14b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================