em28xx 3-1:0.132: Closing input extension ================================================================== BUG: KASAN: slab-out-of-bounds in media_device_unregister+0x13f/0x440 drivers/media/mc/mc-device.c:833 Read of size 8 at addr ffff8880375d8248 by task kworker/1:3/1009 CPU: 1 UID: 0 PID: 1009 Comm: kworker/1:3 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Workqueue: usb_hub_wq hub_event Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 media_device_unregister+0x13f/0x440 drivers/media/mc/mc-device.c:833 em28xx_unregister_media_device drivers/media/usb/em28xx/em28xx-cards.c:3714 [inline] em28xx_release_resources+0xac/0x240 drivers/media/usb/em28xx/em28xx-cards.c:3735 em28xx_usb_disconnect+0x19f/0x2f0 drivers/media/usb/em28xx/em28xx-cards.c:4427 usb_unbind_interface+0x295/0x9f0 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:618 [inline] __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x4f5/0x880 drivers/base/dd.c:1372 bus_remove_device+0x449/0x560 drivers/base/bus.c:664 device_del+0x528/0x8f0 drivers/base/core.c:3961 usb_disable_device+0x3d4/0x8d0 drivers/usb/core/message.c:1478 usb_disconnect+0x32d/0x990 drivers/usb/core/hub.c:2345 hub_port_connect drivers/usb/core/hub.c:5407 [inline] hub_port_connect_change drivers/usb/core/hub.c:5707 [inline] port_event drivers/usb/core/hub.c:5871 [inline] hub_event+0x1bb7/0x4cf0 drivers/usb/core/hub.c:5953 process_one_work+0x93a/0x12b0 kernel/workqueue.c:3326 process_scheduled_works kernel/workqueue.c:3409 [inline] worker_thread+0xb05/0x10d0 kernel/workqueue.c:3490 kthread+0x388/0x470 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 Allocated by task 4966: 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:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5362 [inline] __kmalloc_node_track_caller_noprof+0x57f/0x7c0 mm/slub.c:5497 kmalloc_reserve net/core/skbuff.c:637 [inline] __alloc_skb+0x2bd/0x7a0 net/core/skbuff.c:715 alloc_skb include/linux/skbuff.h:1384 [inline] alloc_skb_with_frags+0xc6/0x760 net/core/skbuff.c:6769 sock_alloc_send_pskb+0x884/0x9a0 net/core/sock.c:3010 unix_dgram_sendmsg+0x4da/0x17b0 net/unix/af_unix.c:2136 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:785 __sock_sendmsg net/socket.c:800 [inline] __sys_sendto+0x41e/0x5d0 net/socket.c:2267 __do_sys_sendto net/socket.c:2274 [inline] __se_sys_sendto net/socket.c:2270 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2270 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 4959: 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:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2705 [inline] slab_free mm/slub.c:6405 [inline] kfree+0x1c5/0x6c0 mm/slub.c:6720 skb_kfree_head net/core/skbuff.c:1077 [inline] skb_free_head net/core/skbuff.c:1089 [inline] skb_release_data+0x85e/0xab0 net/core/skbuff.c:1116 skb_release_all net/core/skbuff.c:1191 [inline] __kfree_skb+0x5d/0x210 net/core/skbuff.c:1205 __unix_dgram_recvmsg+0x9e1/0xd70 net/unix/af_unix.c:2664 sock_recvmsg_nosec+0x130/0x170 net/socket.c:1141 sock_recvmsg net/socket.c:1163 [inline] sock_read_iter+0x26d/0x330 net/socket.c:1232 new_sync_read fs/read_write.c:493 [inline] vfs_read+0x59e/0xa90 fs/read_write.c:574 ksys_read+0x156/0x270 fs/read_write.c:716 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880375d8000 which belongs to the cache kmalloc-cg-512 of size 512 The buggy address is located 72 bytes to the right of allocated 512-byte region [ffff8880375d8000, ffff8880375d8200) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880375d8800 pfn:0x375d8 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff8880375d8211 flags: 0x80000000000240(workingset|head|node=0|zone=1) page_type: f5(slab) raw: 0080000000000240 ffff88813fe3c140 ffff88813fe3d188 ffff88813fe3d188 raw: ffff8880375d8800 0000040000100002 00000000f5000000 ffff8880375d8211 head: 0080000000000240 ffff88813fe3c140 ffff88813fe3d188 ffff88813fe3d188 head: ffff8880375d8800 0000040000100002 00000000f5000000 ffff8880375d8211 head: 0080000000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff head: ffff8880375d9dc0 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4966, tgid 4966 (klogd), ts 295050880160, free_ts 294934623855 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0x2639/0x26b0 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304 alloc_slab_page mm/slub.c:3294 [inline] allocate_slab+0x79/0x5e0 mm/slub.c:3408 new_slab mm/slub.c:3454 [inline] refill_objects+0x2d8/0x350 mm/slub.c:7338 refill_sheaf mm/slub.c:2832 [inline] __pcs_replace_empty_main+0x330/0x690 mm/slub.c:4703 alloc_from_pcs mm/slub.c:4801 [inline] slab_alloc_node mm/slub.c:4933 [inline] __do_kmalloc_node mm/slub.c:5361 [inline] __kmalloc_node_track_caller_noprof+0x62d/0x7c0 mm/slub.c:5497 kmalloc_reserve net/core/skbuff.c:637 [inline] __alloc_skb+0x2bd/0x7a0 net/core/skbuff.c:715 alloc_skb include/linux/skbuff.h:1384 [inline] alloc_skb_with_frags+0xc6/0x760 net/core/skbuff.c:6769 sock_alloc_send_pskb+0x884/0x9a0 net/core/sock.c:3010 unix_dgram_sendmsg+0x4da/0x17b0 net/unix/af_unix.c:2136 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:785 __sock_sendmsg net/socket.c:800 [inline] __sys_sendto+0x41e/0x5d0 net/socket.c:2267 __do_sys_sendto net/socket.c:2274 [inline] __se_sys_sendto net/socket.c:2270 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2270 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 38 tgid 38 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1406 [inline] __free_frozen_pages+0x10de/0x11c0 mm/page_alloc.c:2950 em28xx_free_v4l2 drivers/media/usb/em28xx/em28xx-video.c:2289 [inline] kref_put include/linux/kref.h:65 [inline] em28xx_v4l2_init+0x1884/0x3270 drivers/media/usb/em28xx/em28xx-video.c:3080 em28xx_init_extension+0x120/0x1d0 drivers/media/usb/em28xx/em28xx-core.c:1248 process_one_work+0x93a/0x12b0 kernel/workqueue.c:3326 process_scheduled_works kernel/workqueue.c:3409 [inline] worker_thread+0xb05/0x10d0 kernel/workqueue.c:3490 kthread+0x388/0x470 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: ffff8880375d8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880375d8180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880375d8200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880375d8280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880375d8300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================