em28xx 3-1:0.0: Closing input extension ================================================================== BUG: KASAN: slab-use-after-free in media_device_unregister drivers/media/mc/mc-device.c:804 [inline] BUG: KASAN: slab-use-after-free in media_device_unregister+0x59f/0x5c0 drivers/media/mc/mc-device.c:782 Read of size 8 at addr ffff888129ce8210 by task kworker/1:6/4972 CPU: 1 UID: 0 PID: 4972 Comm: kworker/1:6 Not tainted 6.11.0-rc6-syzkaller-g8d31daeef3ee #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 media_device_unregister drivers/media/mc/mc-device.c:804 [inline] media_device_unregister+0x59f/0x5c0 drivers/media/mc/mc-device.c:782 em28xx_unregister_media_device drivers/media/usb/em28xx/em28xx-cards.c:3511 [inline] em28xx_release_resources+0xb2/0x2d0 drivers/media/usb/em28xx/em28xx-cards.c:3532 em28xx_usb_disconnect+0x1de/0x610 drivers/media/usb/em28xx/em28xx-cards.c:4201 usb_unbind_interface+0x1e8/0x970 drivers/usb/core/driver.c:461 device_remove drivers/base/dd.c:568 [inline] device_remove+0x122/0x170 drivers/base/dd.c:560 __device_release_driver drivers/base/dd.c:1272 [inline] device_release_driver_internal+0x44a/0x610 drivers/base/dd.c:1295 bus_remove_device+0x22f/0x420 drivers/base/bus.c:574 device_del+0x396/0x9f0 drivers/base/core.c:3871 usb_disable_device+0x36c/0x7f0 drivers/usb/core/message.c:1418 usb_disconnect+0x2e1/0x920 drivers/usb/core/hub.c:2304 hub_port_connect drivers/usb/core/hub.c:5361 [inline] hub_port_connect_change drivers/usb/core/hub.c:5661 [inline] port_event drivers/usb/core/hub.c:5821 [inline] hub_event+0x1bed/0x4f40 drivers/usb/core/hub.c:5903 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 41: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:387 kmalloc_noprof include/linux/slab.h:681 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] em28xx_v4l2_init+0x114/0x4050 drivers/media/usb/em28xx/em28xx-video.c:2534 em28xx_init_extension+0x137/0x200 drivers/media/usb/em28xx/em28xx-core.c:1117 request_module_async+0x61/0x70 drivers/media/usb/em28xx/em28xx-cards.c:3457 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Freed by task 41: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object+0xf7/0x160 mm/kasan/common.c:240 __kasan_slab_free+0x14/0x30 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2252 [inline] slab_free mm/slub.c:4473 [inline] kfree+0x10b/0x380 mm/slub.c:4594 em28xx_free_v4l2 drivers/media/usb/em28xx/em28xx-video.c:2120 [inline] kref_put include/linux/kref.h:65 [inline] em28xx_v4l2_init+0x22a4/0x4050 drivers/media/usb/em28xx/em28xx-video.c:2903 em28xx_init_extension+0x137/0x200 drivers/media/usb/em28xx/em28xx-core.c:1117 request_module_async+0x61/0x70 drivers/media/usb/em28xx/em28xx-cards.c:3457 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff888129ce8000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 528 bytes inside of freed 8192-byte region [ffff888129ce8000, ffff888129cea000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x129ce8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x200000000000040(head|node=0|zone=2) page_type: 0xfdffffff(slab) raw: 0200000000000040 ffff888100042280 ffffea00045e4600 0000000000000004 raw: 0000000000000000 0000000080020002 00000001fdffffff 0000000000000000 head: 0200000000000040 ffff888100042280 ffffea00045e4600 0000000000000004 head: 0000000000000000 0000000080020002 00000001fdffffff 0000000000000000 head: 0200000000000003 ffffea0004a73a01 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 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 4931, tgid 4931 (kworker/1:5), ts 1980388475089, free_ts 1979145772557 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x1311/0x25f0 mm/page_alloc.c:3439 __alloc_pages_noprof+0x21e/0x2290 mm/page_alloc.c:4695 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x4e/0xf0 mm/slub.c:2321 allocate_slab mm/slub.c:2484 [inline] new_slab+0x84/0x260 mm/slub.c:2537 ___slab_alloc+0xdac/0x1870 mm/slub.c:3723 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3813 __slab_alloc_node mm/slub.c:3866 [inline] slab_alloc_node mm/slub.c:4025 [inline] __do_kmalloc_node mm/slub.c:4157 [inline] __kmalloc_noprof+0x325/0x3c0 mm/slub.c:4170 kmalloc_noprof include/linux/slab.h:685 [inline] hcd_buffer_alloc+0x1f5/0x290 drivers/usb/core/buffer.c:134 usb_alloc_coherent+0x5f/0xa0 drivers/usb/core/usb.c:1001 usb_allocate_stream_buffers+0x1aa/0x300 drivers/media/usb/dvb-usb/usb-urb.c:121 usb_bulk_urb_init drivers/media/usb/dvb-usb/usb-urb.c:142 [inline] usb_urb_init+0x777/0x1130 drivers/media/usb/dvb-usb/usb-urb.c:229 dvb_usb_adapter_stream_init+0x145/0x3e0 drivers/media/usb/dvb-usb/dvb-usb-urb.c:108 dvb_usb_adapter_init drivers/media/usb/dvb-usb/dvb-usb-init.c:82 [inline] dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:186 [inline] dvb_usb_device_init+0x15a0/0x20a0 drivers/media/usb/dvb-usb/dvb-usb-init.c:310 gp8psk_usb_probe+0x51/0xe0 drivers/media/usb/dvb-usb/gp8psk.c:304 usb_probe_interface+0x309/0x9d0 drivers/usb/core/driver.c:399 page last free pid 17185 tgid 17185 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1094 [inline] free_unref_page+0x698/0xce0 mm/page_alloc.c:2612 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x4e/0x70 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3988 [inline] slab_alloc_node mm/slub.c:4037 [inline] kmem_cache_alloc_noprof+0x11c/0x2b0 mm/slub.c:4044 getname_flags.part.0+0x4c/0x550 fs/namei.c:139 getname_flags include/linux/audit.h:322 [inline] getname fs/namei.c:225 [inline] __do_sys_unlink fs/namei.c:4534 [inline] __se_sys_unlink fs/namei.c:4532 [inline] __x64_sys_unlink+0xb0/0x110 fs/namei.c:4532 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888129ce8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888129ce8180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888129ce8200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888129ce8280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888129ce8300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================