Hello, syzbot found the following issue on: HEAD commit: 31a85035 usb: gadget: fsl_qe_udc: fix implicit-fallthrough.. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing console output: https://syzkaller.appspot.com/x/log.txt?x=109f5a63d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=fbebe41cc7d12c56 dashboard link: https://syzkaller.appspot.com/bug?extid=6bb23a5d5548b93c94aa syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10693995d00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10e23c65d00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6bb23a5d5548b93c94aa@xxxxxxxxxxxxxxxxxxxxxxxxx usb 1-1: config 199 interface 0 altsetting 0 endpoint 0x5 has an invalid bInterval 0, changing to 7 usb 1-1: New USB device found, idVendor=7300, idProduct=128c, bcdDevice=ed.06 usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 1-1: string descriptor 0 read error: -71 usb 1-1: MIDIStreaming interface descriptor not found ================================================================== BUG: KASAN: slab-out-of-bounds in snd_usbmidi_get_ms_info+0xeaf/0x10e0 sound/usb/midi.c:1982 Read of size 1 at addr ffff888119b80722 by task kworker/0:1/7 CPU: 0 PID: 7 Comm: kworker/0:1 Not tainted 5.12.0-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:79 [inline] dump_stack+0x143/0x1db lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:436 snd_usbmidi_get_ms_info+0xeaf/0x10e0 sound/usb/midi.c:1982 __snd_usbmidi_create+0x393/0x1ba0 sound/usb/midi.c:2485 snd_usb_create_quirk+0xa5/0xe0 sound/usb/quirks.c:604 usb_audio_probe+0xcf0/0x2c90 sound/usb/card.c:796 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396 really_probe+0x291/0xf60 drivers/base/dd.c:576 driver_probe_device+0x298/0x410 drivers/base/dd.c:763 __device_attach_driver+0x203/0x2c0 drivers/base/dd.c:870 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4b0 drivers/base/dd.c:938 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xbe0/0x2100 drivers/base/core.c:3319 usb_set_configuration+0x113f/0x1910 drivers/usb/core/message.c:2164 usb_generic_driver_probe+0xba/0x100 drivers/usb/core/generic.c:238 usb_probe_device+0xd9/0x2c0 drivers/usb/core/driver.c:293 really_probe+0x291/0xf60 drivers/base/dd.c:576 driver_probe_device+0x298/0x410 drivers/base/dd.c:763 __device_attach_driver+0x203/0x2c0 drivers/base/dd.c:870 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4b0 drivers/base/dd.c:938 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xbe0/0x2100 drivers/base/core.c:3319 usb_new_device.cold+0x721/0x1058 drivers/usb/core/hub.c:2556 hub_port_connect drivers/usb/core/hub.c:5276 [inline] hub_port_connect_change drivers/usb/core/hub.c:5416 [inline] port_event drivers/usb/core/hub.c:5562 [inline] hub_event+0x2357/0x4330 drivers/usb/core/hub.c:5644 process_one_work+0x98d/0x1580 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x38c/0x460 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Allocated by task 7: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:428 [inline] ____kasan_kmalloc mm/kasan/common.c:507 [inline] __kasan_kmalloc+0x7c/0x90 mm/kasan/common.c:516 kmalloc include/linux/slab.h:561 [inline] usb_get_configuration+0x321/0x3d60 drivers/usb/core/config.c:919 usb_enumerate_device drivers/usb/core/hub.c:2389 [inline] usb_new_device+0x42c/0x7a0 drivers/usb/core/hub.c:2525 hub_port_connect drivers/usb/core/hub.c:5276 [inline] hub_port_connect_change drivers/usb/core/hub.c:5416 [inline] port_event drivers/usb/core/hub.c:5562 [inline] hub_event+0x2357/0x4330 drivers/usb/core/hub.c:5644 process_one_work+0x98d/0x1580 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x38c/0x460 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 The buggy address belongs to the object at ffff888119b80700 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 34 bytes inside of 64-byte region [ffff888119b80700, ffff888119b80740) The buggy address belongs to the page: page:ffffea000466e000 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888119b80680 pfn:0x119b80 flags: 0x200000000000200(slab|node=0|zone=2) raw: 0200000000000200 ffffea0004206f00 0000000900000009 ffff888100041640 raw: ffff888119b80680 000000008020001d 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 2653, ts 10410979522, free_ts 0 prep_new_page mm/page_alloc.c:2358 [inline] get_page_from_freelist+0xc97/0x26a0 mm/page_alloc.c:3994 __alloc_pages+0x1b2/0x4f0 mm/page_alloc.c:5200 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2272 alloc_slab_page mm/slub.c:1644 [inline] allocate_slab+0x2c5/0x4c0 mm/slub.c:1784 new_slab mm/slub.c:1847 [inline] new_slab_objects mm/slub.c:2593 [inline] ___slab_alloc+0x476/0x7b0 mm/slub.c:2756 __slab_alloc+0x68/0x80 mm/slub.c:2796 slab_alloc_node mm/slub.c:2878 [inline] slab_alloc mm/slub.c:2920 [inline] kmem_cache_alloc_trace+0x27e/0x2a0 mm/slub.c:2937 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:686 [inline] allocate_cgrp_cset_links+0x19c/0x240 kernel/cgroup/cgroup.c:1119 find_css_set+0x6d3/0x1a40 kernel/cgroup/cgroup.c:1197 cgroup_migrate_prepare_dst+0x105/0x830 kernel/cgroup/cgroup.c:2641 cgroup_attach_task+0x39f/0x760 kernel/cgroup/cgroup.c:2747 __cgroup1_procs_write.constprop.0+0x3a9/0x490 kernel/cgroup/cgroup-v1.c:519 cgroup_file_write+0x1ec/0x780 kernel/cgroup/cgroup.c:3711 kernfs_fop_write_iter+0x342/0x500 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2114 [inline] new_sync_write+0x426/0x650 fs/read_write.c:518 vfs_write+0x743/0x9e0 fs/read_write.c:605 page_owner free stack trace missing Memory state around the buggy address: ffff888119b80600: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888119b80680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888119b80700: 00 00 00 00 02 fc fc fc fc fc fc fc fc fc fc fc ^ ffff888119b80780: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888119b80800: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== --- This report 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 issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
