================================================================== BUG: KASAN: slab-out-of-bounds in clear_bit include/asm-generic/bitops-instrumented.h:56 [inline] BUG: KASAN: slab-out-of-bounds in sysrq_handle_keypress drivers/tty/sysrq.c:845 [inline] BUG: KASAN: slab-out-of-bounds in sysrq_filter+0x8ff/0xeb0 drivers/tty/sysrq.c:884 Write of size 8 at addr ffff8881cd5069c8 by task syz-executor.1/5252 CPU: 0 PID: 5252 Comm: syz-executor.1 Not tainted 5.4.0-syzkaller #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+0xef/0x16e lib/dump_stack.c:118 print_address_description.constprop.0+0x36/0x50 mm/kasan/report.c:374 __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:506 kasan_report+0xe/0x20 mm/kasan/common.c:638 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x128/0x190 mm/kasan/generic.c:192 clear_bit include/asm-generic/bitops-instrumented.h:56 [inline] sysrq_handle_keypress drivers/tty/sysrq.c:845 [inline] sysrq_filter+0x8ff/0xeb0 drivers/tty/sysrq.c:884 input_to_handler+0x152/0x4c0 drivers/input/input.c:102 input_pass_values.part.0+0x2de/0x710 drivers/input/input.c:145 input_pass_values drivers/input/input.c:949 [inline] input_set_keycode+0x290/0x320 drivers/input/input.c:954 evdev_handle_set_keycode_v2+0xc4/0x120 drivers/input/evdev.c:882 evdev_do_ioctl drivers/input/evdev.c:1150 [inline] evdev_ioctl_handler+0xd49/0x19f0 drivers/input/evdev.c:1284 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:539 [inline] do_vfs_ioctl+0xd2d/0x1330 fs/ioctl.c:726 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:743 __do_sys_ioctl fs/ioctl.c:750 [inline] __se_sys_ioctl fs/ioctl.c:748 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:748 do_syscall_64+0xb7/0x5b0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a6f9 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fbb18b76c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a6f9 RDX: 00000000200000c0 RSI: 0000000040284504 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbb18b776d4 R13: 00000000004c2d5f R14: 00000000004d7f70 R15: 00000000ffffffff Allocated by task 3289: save_stack+0x1b/0x80 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc mm/kasan/common.c:512 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:485 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:670 [inline] sysrq_connect+0x46/0x290 drivers/tty/sysrq.c:902 input_attach_handler+0x194/0x200 drivers/input/input.c:1024 input_register_device.cold+0xf5/0x246 drivers/input/input.c:2224 hidinput_connect+0x4f8d/0xdb90 drivers/hid/hid-input.c:1927 hid_connect+0x965/0xbb0 drivers/hid/hid-core.c:1923 hid_hw_start drivers/hid/hid-core.c:2027 [inline] hid_hw_start+0xa2/0x130 drivers/hid/hid-core.c:2018 ms_probe+0x159/0x4d0 drivers/hid/hid-microsoft.c:394 hid_device_probe+0x2be/0x3f0 drivers/hid/hid-core.c:2255 really_probe+0x281/0x6d0 drivers/base/dd.c:548 driver_probe_device+0x104/0x210 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+0x1480/0x1c20 drivers/base/core.c:2487 hid_add_device drivers/hid/hid-core.c:2411 [inline] hid_add_device+0x33c/0x9a0 drivers/hid/hid-core.c:2360 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+0x104/0x210 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+0x1480/0x1c20 drivers/base/core.c:2487 usb_set_configuration+0xe67/0x1740 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+0x104/0x210 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+0x1480/0x1c20 drivers/base/core.c:2487 usb_new_device.cold+0x6a4/0xe79 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+0x1e59/0x3860 drivers/usb/core/hub.c:5552 process_one_work+0x92b/0x1530 kernel/workqueue.c:2264 process_scheduled_works kernel/workqueue.c:2326 [inline] worker_thread+0x7ab/0xe20 kernel/workqueue.c:2412 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Freed by task 239: save_stack+0x1b/0x80 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] kasan_set_free_info mm/kasan/common.c:334 [inline] __kasan_slab_free+0x130/0x180 mm/kasan/common.c:473 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+0xdc/0x310 mm/slub.c:3957 skb_free_head+0x8b/0xa0 net/core/skbuff.c:591 skb_release_data+0x41f/0x7c0 net/core/skbuff.c:611 skb_release_all+0x46/0x60 net/core/skbuff.c:665 __kfree_skb net/core/skbuff.c:679 [inline] consume_skb net/core/skbuff.c:838 [inline] consume_skb+0xd9/0x380 net/core/skbuff.c:832 skb_free_datagram+0x16/0xf0 net/core/datagram.c:328 unix_dgram_recvmsg+0x49c/0xed0 net/unix/af_unix.c:2137 sock_recvmsg_nosec net/socket.c:873 [inline] sock_recvmsg net/socket.c:891 [inline] sock_recvmsg+0xca/0x110 net/socket.c:887 __sys_recvfrom+0x1bf/0x2f0 net/socket.c:2042 __do_sys_recvfrom net/socket.c:2060 [inline] __se_sys_recvfrom net/socket.c:2056 [inline] __x64_sys_recvfrom+0xdd/0x1b0 net/socket.c:2056 do_syscall_64+0xb7/0x5b0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8881cd506800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 456 bytes inside of 512-byte region [ffff8881cd506800, ffff8881cd506a00) The buggy address belongs to the page: page:ffffea0007354100 refcount:1 mapcount:0 mapping:ffff8881da402500 index:0x0 compound_mapcount: 0 raw: 0200000000010200 0000000000000000 0000000100000001 ffff8881da402500 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881cd506880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881cd506900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881cd506980: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ^ ffff8881cd506a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881cd506a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================