On Mon, Jan 13, 2020 at 1:24 PM syzbot <syzbot+9a48339b077c5a80b869@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: ae179410 usb: gadget: add raw-gadget interface > git tree: https://github.com/google/kasan.git usb-fuzzer > console output: https://syzkaller.appspot.com/x/log.txt?x=132223fee00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=ad1d751a3a72ae57 > dashboard link: https://syzkaller.appspot.com/bug?extid=9a48339b077c5a80b869 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16857325e00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=142e069ee00000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+9a48339b077c5a80b869@xxxxxxxxxxxxxxxxxxxxxxxxx > > usb 1-1: New USB device found, idVendor=0bd3, idProduct=0555, > bcdDevice=69.6a > usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 > usb 1-1: config 0 descriptor?? > usb 1-1: string descriptor 0 read error: -71 > uvcvideo: Found UVC 0.00 device <unnamed> (0bd3:0555) > ================================================================== > BUG: KASAN: use-after-free in uvc_register_terms > drivers/media/usb/uvc/uvc_driver.c:2038 [inline] > BUG: KASAN: use-after-free in uvc_register_chains > drivers/media/usb/uvc/uvc_driver.c:2070 [inline] > BUG: KASAN: use-after-free in uvc_probe.cold+0x2193/0x29de > drivers/media/usb/uvc/uvc_driver.c:2201 > Read of size 2 at addr ffff8881d4f1bc2e by task kworker/1:2/94 > > CPU: 1 PID: 94 Comm: kworker/1:2 Not tainted 5.5.0-rc3-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Workqueue: usb_hub_wq hub_event > Call Trace: > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0xef/0x16e lib/dump_stack.c:118 > print_address_description.constprop.0.cold+0xd3/0x314 mm/kasan/report.c:374 > __kasan_report.cold+0x37/0x85 mm/kasan/report.c:506 > kasan_report+0xe/0x20 mm/kasan/common.c:639 > uvc_register_terms drivers/media/usb/uvc/uvc_driver.c:2038 [inline] > uvc_register_chains drivers/media/usb/uvc/uvc_driver.c:2070 [inline] > uvc_probe.cold+0x2193/0x29de drivers/media/usb/uvc/uvc_driver.c:2201 > usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:361 > really_probe+0x290/0xad0 drivers/base/dd.c:548 > driver_probe_device+0x223/0x350 drivers/base/dd.c:721 > __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828 > bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430 > __device_attach+0x217/0x390 drivers/base/dd.c:894 > bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 > device_add+0x1459/0x1bf0 drivers/base/core.c:2487 > usb_set_configuration+0xe47/0x17d0 drivers/usb/core/message.c:2023 > generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210 > usb_probe_device+0xaf/0x140 drivers/usb/core/driver.c:266 > really_probe+0x290/0xad0 drivers/base/dd.c:548 > driver_probe_device+0x223/0x350 drivers/base/dd.c:721 > __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828 > bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430 > __device_attach+0x217/0x390 drivers/base/dd.c:894 > bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 > device_add+0x1459/0x1bf0 drivers/base/core.c:2487 > usb_new_device.cold+0x540/0xcd0 drivers/usb/core/hub.c:2537 > hub_port_connect drivers/usb/core/hub.c:5184 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5324 [inline] > port_event drivers/usb/core/hub.c:5470 [inline] > hub_event+0x21cb/0x4300 drivers/usb/core/hub.c:5552 > process_one_work+0x945/0x15c0 kernel/workqueue.c:2264 > worker_thread+0x96/0xe20 kernel/workqueue.c:2410 > kthread+0x318/0x420 kernel/kthread.c:255 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > > Allocated by task 94: > save_stack+0x1b/0x80 mm/kasan/common.c:72 > set_track mm/kasan/common.c:80 [inline] > __kasan_kmalloc mm/kasan/common.c:513 [inline] > __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:486 > kmalloc include/linux/slab.h:556 [inline] > kzalloc include/linux/slab.h:670 [inline] > uvc_alloc_chain+0x48/0xfa drivers/media/usb/uvc/uvc_driver.c:1692 > uvc_scan_device drivers/media/usb/uvc/uvc_driver.c:1818 [inline] > uvc_probe.cold+0x15f0/0x29de drivers/media/usb/uvc/uvc_driver.c:2197 > usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:361 > really_probe+0x290/0xad0 drivers/base/dd.c:548 > driver_probe_device+0x223/0x350 drivers/base/dd.c:721 > __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828 > bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430 > __device_attach+0x217/0x390 drivers/base/dd.c:894 > bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 > device_add+0x1459/0x1bf0 drivers/base/core.c:2487 > usb_set_configuration+0xe47/0x17d0 drivers/usb/core/message.c:2023 > generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210 > usb_probe_device+0xaf/0x140 drivers/usb/core/driver.c:266 > really_probe+0x290/0xad0 drivers/base/dd.c:548 > driver_probe_device+0x223/0x350 drivers/base/dd.c:721 > __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828 > bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430 > __device_attach+0x217/0x390 drivers/base/dd.c:894 > bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 > device_add+0x1459/0x1bf0 drivers/base/core.c:2487 > usb_new_device.cold+0x540/0xcd0 drivers/usb/core/hub.c:2537 > hub_port_connect drivers/usb/core/hub.c:5184 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5324 [inline] > port_event drivers/usb/core/hub.c:5470 [inline] > hub_event+0x21cb/0x4300 drivers/usb/core/hub.c:5552 > process_one_work+0x945/0x15c0 kernel/workqueue.c:2264 > worker_thread+0x96/0xe20 kernel/workqueue.c:2410 > kthread+0x318/0x420 kernel/kthread.c:255 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > > Freed by task 94: > save_stack+0x1b/0x80 mm/kasan/common.c:72 > set_track mm/kasan/common.c:80 [inline] > kasan_set_free_info mm/kasan/common.c:335 [inline] > __kasan_slab_free+0x117/0x160 mm/kasan/common.c:474 > slab_free_hook mm/slub.c:1425 [inline] > slab_free_freelist_hook mm/slub.c:1458 [inline] > slab_free mm/slub.c:3005 [inline] > kfree+0xd5/0x300 mm/slub.c:3957 > uvc_scan_device drivers/media/usb/uvc/uvc_driver.c:1825 [inline] > uvc_probe.cold+0x16fd/0x29de drivers/media/usb/uvc/uvc_driver.c:2197 > usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:361 > really_probe+0x290/0xad0 drivers/base/dd.c:548 > driver_probe_device+0x223/0x350 drivers/base/dd.c:721 > __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828 > bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430 > __device_attach+0x217/0x390 drivers/base/dd.c:894 > bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 > device_add+0x1459/0x1bf0 drivers/base/core.c:2487 > usb_set_configuration+0xe47/0x17d0 drivers/usb/core/message.c:2023 > generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210 > usb_probe_device+0xaf/0x140 drivers/usb/core/driver.c:266 > really_probe+0x290/0xad0 drivers/base/dd.c:548 > driver_probe_device+0x223/0x350 drivers/base/dd.c:721 > __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828 > bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430 > __device_attach+0x217/0x390 drivers/base/dd.c:894 > bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 > device_add+0x1459/0x1bf0 drivers/base/core.c:2487 > usb_new_device.cold+0x540/0xcd0 drivers/usb/core/hub.c:2537 > hub_port_connect drivers/usb/core/hub.c:5184 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5324 [inline] > port_event drivers/usb/core/hub.c:5470 [inline] > hub_event+0x21cb/0x4300 drivers/usb/core/hub.c:5552 > process_one_work+0x945/0x15c0 kernel/workqueue.c:2264 > worker_thread+0x96/0xe20 kernel/workqueue.c:2410 > kthread+0x318/0x420 kernel/kthread.c:255 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > > The buggy address belongs to the object at ffff8881d4f1bc00 > which belongs to the cache kmalloc-256 of size 256 > The buggy address is located 46 bytes inside of > 256-byte region [ffff8881d4f1bc00, ffff8881d4f1bd00) > The buggy address belongs to the page: > page:ffffea000753c680 refcount:1 mapcount:0 mapping:ffff8881da002780 > index:0x0 compound_mapcount: 0 > raw: 0200000000010200 ffffea000753c600 0000000300000003 ffff8881da002780 > raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff8881d4f1bb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff8881d4f1bb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > > ffff8881d4f1bc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ^ > ffff8881d4f1bc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8881d4f1bd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ================================================================== > > > --- > This bug is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches Fixed by something. #syz invalid
