Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor1 (pid 31130) Use of int in maxseg socket option. Use struct sctp_assoc_value instead vhci_hcd: invalid port number 108 ================================================================== BUG: KASAN: use-after-free in vhci_hub_control+0x2b06/0x2c40 drivers/usb/usbip/vhci_hcd.c:441 Read of size 4 at addr ffff8801ce2377bc by task syz-executor1/31139 CPU: 1 PID: 31139 Comm: syz-executor1 Not tainted 4.19.0-rc5+ #258 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+0x1c4/0x2b4 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 vhci_hub_control+0x2b06/0x2c40 drivers/usb/usbip/vhci_hcd.c:441 rh_call_control drivers/usb/core/hcd.c:679 [inline] rh_urb_enqueue drivers/usb/core/hcd.c:838 [inline] usb_hcd_submit_urb+0x1973/0x22b0 drivers/usb/core/hcd.c:1651 usb_submit_urb+0x893/0x1590 drivers/usb/core/urb.c:570 usb_start_wait_urb+0x13d/0x5a0 drivers/usb/core/message.c:57 usb_internal_control_msg drivers/usb/core/message.c:101 [inline] usb_control_msg+0x332/0x4e0 drivers/usb/core/message.c:152 proc_control+0x99b/0xef0 drivers/usb/core/devio.c:1106 usbdev_do_ioctl+0x1eb8/0x3b50 drivers/usb/core/devio.c:2412 usbdev_ioctl+0x25/0x30 drivers/usb/core/devio.c:2569 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457579 Code: 1d b4 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 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fc3d40ccc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457579 RDX: 0000000020000000 RSI: 00000000c0185500 RDI: 0000000000000004 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc3d40cd6d4 R13: 00000000004bf6c0 R14: 00000000004cf598 R15: 00000000ffffffff Allocated by task 31107: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 kmem_cache_alloc_trace+0x152/0x750 mm/slab.c:3620 kmalloc include/linux/slab.h:513 [inline] kzalloc include/linux/slab.h:707 [inline] kernfs_iop_get_link+0x6d/0x660 fs/kernfs/symlink.c:133 get_link fs/namei.c:1084 [inline] trailing_symlink+0x779/0x970 fs/namei.c:2263 path_openat+0xb58/0x5160 fs/namei.c:3536 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x568/0x700 fs/open.c:1063 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 31107: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3813 kfree_link+0x15/0x20 fs/libfs.c:1105 do_delayed_call include/linux/delayed_call.h:28 [inline] put_link fs/namei.c:883 [inline] step_into fs/namei.c:1772 [inline] do_last fs/namei.c:3383 [inline] path_openat+0x1f57/0x5160 fs/namei.c:3534 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x568/0x700 fs/open.c:1063 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801ce236dc0 which belongs to the cache kmalloc-4096 of size 4096 The buggy address is located 2556 bytes inside of 4096-byte region [ffff8801ce236dc0, ffff8801ce237dc0) The buggy address belongs to the page: page:ffffea0007388d80 count:1 mapcount:0 mapping:ffff8801da800dc0 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea0006fb5a08 ffffea0007253f08 ffff8801da800dc0 raw: 0000000000000000 ffff8801ce236dc0 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801ce237680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801ce237700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801ce237780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801ce237800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801ce237880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================