usb 2-1: USB disconnect, device number 2 ================================================================== BUG: KASAN: use-after-free in hdm_disconnect+0x109/0x1c0 drivers/most/most_usb.c:1125 Read of size 8 at addr ffff88801fc55960 by task kworker/0:8/4237 CPU: 0 PID: 4237 Comm: kworker/0:8 Not tainted 5.15.173-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 print_address_description+0x63/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x16b/0x1c0 mm/kasan/report.c:451 hdm_disconnect+0x109/0x1c0 drivers/most/most_usb.c:1125 usb_unbind_interface+0x1cd/0x840 drivers/usb/core/driver.c:458 __device_release_driver drivers/base/dd.c:1229 [inline] device_release_driver_internal+0x50e/0x7f0 drivers/base/dd.c:1262 bus_remove_device+0x2e5/0x400 drivers/base/bus.c:531 device_del+0x6e2/0xbd0 drivers/base/core.c:3600 usb_disable_device+0x3b8/0x840 drivers/usb/core/message.c:1414 usb_disconnect+0x33c/0x8c0 drivers/usb/core/hub.c:2248 hub_port_connect drivers/usb/core/hub.c:5299 [inline] hub_port_connect_change drivers/usb/core/hub.c:5595 [inline] port_event drivers/usb/core/hub.c:5741 [inline] hub_event+0x1d58/0x54c0 drivers/usb/core/hub.c:5823 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Allocated by task 4237: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc+0xba/0xf0 mm/kasan/common.c:513 kasan_kmalloc include/linux/kasan.h:264 [inline] kmem_cache_alloc_trace+0x143/0x290 mm/slub.c:3247 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] hdm_probe+0x91/0x13d0 drivers/most/most_usb.c:959 usb_probe_interface+0x5c0/0xaf0 drivers/usb/core/driver.c:396 really_probe+0x24e/0xb60 drivers/base/dd.c:595 __driver_probe_device+0x1a2/0x3d0 drivers/base/dd.c:755 driver_probe_device+0x50/0x420 drivers/base/dd.c:785 __device_attach_driver+0x2b9/0x500 drivers/base/dd.c:907 bus_for_each_drv+0x183/0x200 drivers/base/bus.c:429 __device_attach+0x359/0x570 drivers/base/dd.c:979 bus_probe_device+0xba/0x1e0 drivers/base/bus.c:489 device_add+0xb48/0xfd0 drivers/base/core.c:3412 usb_set_configuration+0x19dd/0x2020 drivers/usb/core/message.c:2165 usb_generic_driver_probe+0x84/0x140 drivers/usb/core/generic.c:238 usb_probe_device+0x130/0x260 drivers/usb/core/driver.c:293 really_probe+0x24e/0xb60 drivers/base/dd.c:595 __driver_probe_device+0x1a2/0x3d0 drivers/base/dd.c:755 driver_probe_device+0x50/0x420 drivers/base/dd.c:785 __device_attach_driver+0x2b9/0x500 drivers/base/dd.c:907 bus_for_each_drv+0x183/0x200 drivers/base/bus.c:429 __device_attach+0x359/0x570 drivers/base/dd.c:979 bus_probe_device+0xba/0x1e0 drivers/base/bus.c:489 device_add+0xb48/0xfd0 drivers/base/core.c:3412 usb_new_device+0xc17/0x18e0 drivers/usb/core/hub.c:2593 hub_port_connect drivers/usb/core/hub.c:5455 [inline] hub_port_connect_change drivers/usb/core/hub.c:5595 [inline] port_event drivers/usb/core/hub.c:5741 [inline] hub_event+0x2cdf/0x54c0 drivers/usb/core/hub.c:5823 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Freed by task 4237: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x80 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kfree+0xf1/0x270 mm/slub.c:4559 device_release+0x91/0x1c0 kobject_cleanup lib/kobject.c:713 [inline] kobject_release lib/kobject.c:744 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x224/0x460 lib/kobject.c:761 hdm_disconnect+0xef/0x1c0 drivers/most/most_usb.c:1123 usb_unbind_interface+0x1cd/0x840 drivers/usb/core/driver.c:458 __device_release_driver drivers/base/dd.c:1229 [inline] device_release_driver_internal+0x50e/0x7f0 drivers/base/dd.c:1262 bus_remove_device+0x2e5/0x400 drivers/base/bus.c:531 device_del+0x6e2/0xbd0 drivers/base/core.c:3600 usb_disable_device+0x3b8/0x840 drivers/usb/core/message.c:1414 usb_disconnect+0x33c/0x8c0 drivers/usb/core/hub.c:2248 hub_port_connect drivers/usb/core/hub.c:5299 [inline] hub_port_connect_change drivers/usb/core/hub.c:5595 [inline] port_event drivers/usb/core/hub.c:5741 [inline] hub_event+0x1d58/0x54c0 drivers/usb/core/hub.c:5823 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the object at ffff88801fc54000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 6496 bytes inside of 8192-byte region [ffff88801fc54000, ffff88801fc56000) The buggy address belongs to the page: page:ffffea00007f1400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1fc50 head:ffffea00007f1400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001f14c00 0000000200000002 ffff888017442280 raw: 0000000000000000 0000000080020002 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4247, ts 67166968336, free_ts 67128903004 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x3b78/0x3d40 mm/page_alloc.c:4192 __alloc_pages+0x272/0x700 mm/page_alloc.c:5464 alloc_slab_page mm/slub.c:1775 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xbb/0x4b0 mm/slub.c:1975 ___slab_alloc+0x6f6/0xe10 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] __kmalloc_node+0x1fa/0x390 mm/slub.c:4451 kmalloc_node include/linux/slab.h:614 [inline] kvmalloc_node+0x80/0x140 mm/util.c:619 kvmalloc include/linux/mm.h:805 [inline] kvzalloc include/linux/mm.h:813 [inline] bpf_check+0x142/0x12d40 kernel/bpf/verifier.c:14016 bpf_prog_load+0x12b3/0x1b60 kernel/bpf/syscall.c:2353 __sys_bpf+0x343/0x670 kernel/bpf/syscall.c:4651 __do_sys_bpf kernel/bpf/syscall.c:4755 [inline] __se_sys_bpf kernel/bpf/syscall.c:4753 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4753 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317 free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396 do_slab_free mm/slub.c:3487 [inline] ___cache_free+0xe3/0x100 mm/slub.c:3506 qlist_free_all+0x36/0x90 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x162/0x180 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xc0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x53/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] kmem_cache_alloc_node+0x121/0x2c0 mm/slub.c:3256 __alloc_skb+0xdd/0x590 net/core/skbuff.c:415 alloc_skb include/linux/skbuff.h:1162 [inline] nlmsg_new include/net/netlink.h:953 [inline] rtmsg_ifinfo_build_skb+0x81/0x180 net/core/rtnetlink.c:3881 rtmsg_ifinfo_event net/core/rtnetlink.c:3917 [inline] rtmsg_ifinfo+0x71/0x120 net/core/rtnetlink.c:3926 netdev_state_change+0x1be/0x250 net/core/dev.c:1411 linkwatch_do_dev+0x10c/0x160 net/core/link_watch.c:167 __linkwatch_run_queue+0x4ca/0x7f0 net/core/link_watch.c:213 linkwatch_event+0x48/0x50 net/core/link_watch.c:252 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 Memory state around the buggy address: ffff88801fc55800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801fc55880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801fc55900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801fc55980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801fc55a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================