================================================================== BUG: KASAN: use-after-free in v4l2_fh_init+0x274/0x2c0 drivers/media/v4l2-core/v4l2-fh.c:25 Read of size 8 at addr ffff88805b850900 by task v4l_id/10100 CPU: 1 PID: 10100 Comm: v4l_id Not tainted 5.16.0-rc3-syzkaller #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+0x57/0x7d lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x2ed mm/kasan/report.c:247 __kasan_report mm/kasan/report.c:433 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:450 v4l2_fh_init+0x274/0x2c0 drivers/media/v4l2-core/v4l2-fh.c:25 v4l2_fh_open+0x78/0xb0 drivers/media/v4l2-core/v4l2-fh.c:63 em28xx_v4l2_open+0xd6/0x430 drivers/media/usb/em28xx/em28xx-video.c:2163 v4l2_open+0x1e3/0x370 drivers/media/v4l2-core/v4l2-dev.c:427 chrdev_open+0x20f/0x650 fs/char_dev.c:414 do_dentry_open+0x429/0x1040 fs/open.c:822 do_open fs/namei.c:3426 [inline] path_openat+0x9ea/0x2250 fs/namei.c:3559 do_filp_open+0x199/0x3d0 fs/namei.c:3586 do_sys_openat2+0x11e/0x400 fs/open.c:1212 do_sys_open fs/open.c:1228 [inline] __do_sys_open fs/open.c:1236 [inline] __se_sys_open fs/open.c:1232 [inline] __x64_sys_open+0xfd/0x1a0 fs/open.c:1232 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+0x44/0xae RIP: 0033:0x7f55b19fe840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007fffc773f548 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fffc773f6b8 RCX: 00007f55b19fe840 RDX: 00007f55b19eaea0 RSI: 0000000000000000 RDI: 00007fffc773ff1c RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 00005615f1ccb8d0 R13: 00007fffc773f6b0 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 1136: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0xa6/0xd0 mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:269 [inline] kmem_cache_alloc_trace+0x1ea/0x4a0 mm/slab.c:3575 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:724 [inline] em28xx_v4l2_init drivers/media/usb/em28xx/em28xx-video.c:2542 [inline] em28xx_v4l2_init.cold+0x91/0x2d6d drivers/media/usb/em28xx/em28xx-video.c:2520 em28xx_init_extension+0x106/0x1c0 drivers/media/usb/em28xx/em28xx-core.c:1126 process_one_work+0x87f/0x1450 kernel/workqueue.c:2298 process_scheduled_works kernel/workqueue.c:2361 [inline] worker_thread+0x704/0x1040 kernel/workqueue.c:2450 kthread+0x3ab/0x480 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Freed by task 1136: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xd1/0x110 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:235 [inline] __cache_free mm/slab.c:3445 [inline] kfree+0x10d/0x2c0 mm/slab.c:3802 em28xx_v4l2_init drivers/media/usb/em28xx/em28xx-video.c:2911 [inline] em28xx_v4l2_init.cold+0x24a/0x2d6d drivers/media/usb/em28xx/em28xx-video.c:2520 em28xx_init_extension+0x106/0x1c0 drivers/media/usb/em28xx/em28xx-core.c:1126 process_one_work+0x87f/0x1450 kernel/workqueue.c:2298 process_scheduled_works kernel/workqueue.c:2361 [inline] worker_thread+0x704/0x1040 kernel/workqueue.c:2450 kthread+0x3ab/0x480 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Last potentially related work creation: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 __kasan_record_aux_stack+0xb5/0xe0 mm/kasan/generic.c:348 insert_work+0x42/0x300 kernel/workqueue.c:1354 __queue_work+0x4a5/0xc80 kernel/workqueue.c:1520 queue_work_on+0x70/0x80 kernel/workqueue.c:1547 queue_work include/linux/workqueue.h:502 [inline] schedule_work include/linux/workqueue.h:563 [inline] request_modules drivers/media/usb/em28xx/em28xx-cards.c:3435 [inline] em28xx_usb_probe.cold+0x121c/0x2277 drivers/media/usb/em28xx/em28xx-cards.c:4093 usb_probe_interface+0x274/0x6a0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x1c2/0xb60 drivers/base/dd.c:596 __driver_probe_device+0x2a6/0x460 drivers/base/dd.c:751 driver_probe_device+0x44/0x110 drivers/base/dd.c:781 __device_attach_driver+0x185/0x250 drivers/base/dd.c:898 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:427 __device_attach+0x1db/0x410 drivers/base/dd.c:969 bus_probe_device+0x19d/0x250 drivers/base/bus.c:487 device_add+0xa57/0x1b80 drivers/base/core.c:3394 usb_set_configuration+0xc91/0x1840 drivers/usb/core/message.c:2170 usb_generic_driver_probe+0x74/0xa0 drivers/usb/core/generic.c:238 usb_probe_device+0x95/0x240 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x1c2/0xb60 drivers/base/dd.c:596 __driver_probe_device+0x2a6/0x460 drivers/base/dd.c:751 driver_probe_device+0x44/0x110 drivers/base/dd.c:781 __device_attach_driver+0x185/0x250 drivers/base/dd.c:898 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:427 __device_attach+0x1db/0x410 drivers/base/dd.c:969 bus_probe_device+0x19d/0x250 drivers/base/bus.c:487 device_add+0xa57/0x1b80 drivers/base/core.c:3394 usb_new_device.cold+0x5cf/0xee8 drivers/usb/core/hub.c:2563 hub_port_connect drivers/usb/core/hub.c:5353 [inline] hub_port_connect_change drivers/usb/core/hub.c:5497 [inline] port_event drivers/usb/core/hub.c:5643 [inline] hub_event+0x111f/0x3830 drivers/usb/core/hub.c:5725 process_one_work+0x87f/0x1450 kernel/workqueue.c:2298 worker_thread+0x598/0x1040 kernel/workqueue.c:2445 kthread+0x3ab/0x480 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff88805b850000 which belongs to the cache kmalloc-16k of size 16384 The buggy address is located 2304 bytes inside of 16384-byte region [ffff88805b850000, ffff88805b854000) The buggy address belongs to the page: page:ffffea00016e1400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5b850 head:ffffea00016e1400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea000163a808 ffffea000197bc08 ffff88800fc40b00 raw: 0000000000000000 ffff88805b850000 0000000100000001 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 0x2420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE), pid 8873, ts 72407801157, free_ts 72209548336 prep_new_page mm/page_alloc.c:2418 [inline] get_page_from_freelist+0xa6f/0x2f10 mm/page_alloc.c:4149 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5369 __alloc_pages_node include/linux/gfp.h:570 [inline] kmem_getpages mm/slab.c:1377 [inline] cache_grow_begin+0x75/0x470 mm/slab.c:2593 cache_alloc_refill+0x27f/0x380 mm/slab.c:2965 ____cache_alloc mm/slab.c:3048 [inline] ____cache_alloc mm/slab.c:3031 [inline] __do_cache_alloc mm/slab.c:3275 [inline] slab_alloc mm/slab.c:3316 [inline] kmem_cache_alloc_trace+0x380/0x4a0 mm/slab.c:3573 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:724 [inline] em28xx_v4l2_init drivers/media/usb/em28xx/em28xx-video.c:2542 [inline] em28xx_v4l2_init.cold+0x91/0x2d6d drivers/media/usb/em28xx/em28xx-video.c:2520 em28xx_init_extension+0x106/0x1c0 drivers/media/usb/em28xx/em28xx-core.c:1126 process_one_work+0x87f/0x1450 kernel/workqueue.c:2298 worker_thread+0x598/0x1040 kernel/workqueue.c:2445 kthread+0x3ab/0x480 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1338 [inline] free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3309 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3388 release_pages+0x5b9/0x10a0 mm/swap.c:956 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:242 [inline] tlb_flush_mmu+0xbb/0x590 mm/mmu_gather.c:249 zap_pte_range mm/memory.c:1418 [inline] zap_pmd_range mm/memory.c:1467 [inline] zap_pud_range mm/memory.c:1496 [inline] zap_p4d_range mm/memory.c:1517 [inline] unmap_page_range+0x146c/0x2180 mm/memory.c:1538 unmap_vmas+0x14f/0x280 mm/memory.c:1615 exit_mmap+0x19d/0x540 mm/mmap.c:3170 __mmput+0xed/0x430 kernel/fork.c:1113 exit_mm kernel/exit.c:507 [inline] do_exit+0x9a8/0x25c0 kernel/exit.c:819 do_group_exit+0xe7/0x290 kernel/exit.c:929 get_signal+0x3b0/0x1ce0 kernel/signal.c:2852 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae Memory state around the buggy address: ffff88805b850800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805b850880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805b850900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805b850980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805b850a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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