================================================================== BUG: KASAN: slab-out-of-bounds in hiddev_ioctl_usage.isra.0+0x1251/0x13b0 drivers/hid/usbhid/hiddev.c:541 Write of size 4 at addr ffff8881d59384b4 by task syz-executor819/1731 CPU: 1 PID: 1731 Comm: syz-executor819 Not tainted 5.3.0+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xca/0x13e lib/dump_stack.c:113 print_address_description+0x6a/0x32c mm/kasan/report.c:351 __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482 kasan_report+0xe/0x12 mm/kasan/common.c:618 hiddev_ioctl_usage.isra.0+0x1251/0x13b0 drivers/hid/usbhid/hiddev.c:541 hiddev_ioctl+0x7a1/0x1550 drivers/hid/usbhid/hiddev.c:807 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0xd2d/0x1330 fs/ioctl.c:696 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:718 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x444809 Code: e8 bc af 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 1b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffd4d98f5b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000444809 RDX: 00000000200008c0 RSI: 000000004018480c RDI: 0000000000000004 RBP: 00000000006cf018 R08: 18c1180b508ac6d9 R09: 00000000004002e0 R10: 000000000000000f R11: 0000000000000246 R12: 00000000004024b0 R13: 0000000000402540 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 83: save_stack+0x1b/0x80 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:493 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:466 kmalloc include/linux/slab.h:557 [inline] kzalloc include/linux/slab.h:748 [inline] hid_register_field drivers/hid/hid-core.c:102 [inline] hid_add_field+0x444/0x11c0 drivers/hid/hid-core.c:277 hid_parser_main+0x6ab/0xbf0 drivers/hid/hid-core.c:579 hid_open_report+0x372/0x620 drivers/hid/hid-core.c:1202 hid_parse include/linux/hid.h:1017 [inline] cmhid_probe+0xdd/0x160 drivers/hid/hid-cmedia.c:117 hid_device_probe+0x2be/0x3f0 drivers/hid/hid-core.c:2209 really_probe+0x281/0x6d0 drivers/base/dd.c:548 driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 device_add+0xae6/0x16f0 drivers/base/core.c:2201 hid_add_device+0x33c/0x990 drivers/hid/hid-core.c:2365 usbhid_probe+0xa81/0xfa0 drivers/hid/usbhid/hid-core.c:1386 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361 really_probe+0x281/0x6d0 drivers/base/dd.c:548 driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 device_add+0xae6/0x16f0 drivers/base/core.c:2201 usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023 generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210 usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266 really_probe+0x281/0x6d0 drivers/base/dd.c:548 driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430 __device_attach+0x217/0x360 drivers/base/dd.c:894 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490 device_add+0xae6/0x16f0 drivers/base/core.c:2201 usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536 hub_port_connect drivers/usb/core/hub.c:5098 [inline] hub_port_connect_change drivers/usb/core/hub.c:5213 [inline] port_event drivers/usb/core/hub.c:5359 [inline] hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441 process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 worker_thread+0x96/0xe20 kernel/workqueue.c:2415 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Freed by task 1: save_stack+0x1b/0x80 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_slab_free+0x130/0x180 mm/kasan/common.c:455 slab_free_hook mm/slub.c:1423 [inline] slab_free_freelist_hook mm/slub.c:1474 [inline] slab_free mm/slub.c:3016 [inline] kfree+0xe4/0x2f0 mm/slub.c:3957 do_new_mount fs/namespace.c:2798 [inline] do_mount+0x69f/0x1af0 fs/namespace.c:3114 ksys_mount+0xd7/0x150 fs/namespace.c:3323 do_mount_root+0x32/0x1ce init/do_mounts.c:389 mount_block_root+0x317/0x5d3 init/do_mounts.c:418 mount_root+0x1cd/0x213 init/do_mounts.c:563 prepare_namespace+0x1ff/0x23b init/do_mounts.c:622 kernel_init_freeable+0x57e/0x596 init/main.c:1211 kernel_init+0xd/0x1bf init/main.c:1110 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff8881d59383c0 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 244 bytes inside of 256-byte region [ffff8881d59383c0, ffff8881d59384c0) The buggy address belongs to the page: page:ffffea0007564e00 refcount:1 mapcount:0 mapping:ffff8881da002780 index:0x0 flags: 0x200000000000200(slab) raw: 0200000000000200 ffffea0007607e40 0000000b0000000b ffff8881da002780 raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881d5938380: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ffff8881d5938400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881d5938480: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff8881d5938500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881d5938580: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ==================================================================