================================================================== BUG: KASAN: double-free or invalid-free in gadget_ep0_complete+0x17b/0x560 drivers/usb/gadget/fuzzer/fuzzer.c:471 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.2.0-rc6+ #12 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+0x67/0x231 mm/kasan/report.c:188 kasan_report_invalid_free+0x61/0xa0 mm/kasan/report.c:279 __kasan_slab_free+0x162/0x180 mm/kasan/common.c:430 slab_free_hook mm/slub.c:1421 [inline] slab_free_freelist_hook mm/slub.c:1448 [inline] slab_free mm/slub.c:2994 [inline] kfree+0xd7/0x280 mm/slub.c:3949 gadget_ep0_complete+0x17b/0x560 drivers/usb/gadget/fuzzer/fuzzer.c:471 dummy_timer.cold+0x22a/0x3c0 drivers/usb/gadget/udc/dummy_hcd.c:1874 call_timer_fn+0x15e/0x5e0 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers kernel/time/timer.c:1685 [inline] __run_timers kernel/time/timer.c:1653 [inline] run_timer_softirq+0x597/0x1410 kernel/time/timer.c:1698 __do_softirq+0x219/0x8b0 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x17c/0x1a0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0xe2/0x480 arch/x86/kernel/apic/apic.c:1068 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:806 RIP: 0010:default_idle+0x28/0x2b0 arch/x86/kernel/process.c:581 Code: 00 00 41 56 41 55 41 54 55 53 65 44 8b 2d 60 93 92 7a 0f 1f 44 00 00 e8 e6 03 d3 fb e9 07 00 00 00 0f 00 2d 5a 1f 53 00 fb f4 <65> 44 8b 2d 40 93 92 7a 0f 1f 44 00 00 5b 5d 41 5c 41 5d 41 5e c3 RSP: 0018:ffffffff86e07dc0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffffffff86e2b974 RBP: fffffbfff0dc5628 R08: ffffffff86e2b140 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff86e2b140 R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff86e2b140 cpuidle_idle_call kernel/sched/idle.c:154 [inline] do_idle+0x2de/0x380 kernel/sched/idle.c:263 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:354 start_kernel+0x7e0/0x81a init/main.c:761 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243 Allocated by task 5045: save_stack+0x1b/0x80 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc mm/kasan/common.c:489 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:462 slab_post_alloc_hook mm/slab.h:437 [inline] slab_alloc_node mm/slub.c:2748 [inline] slab_alloc mm/slub.c:2756 [inline] __kmalloc_track_caller+0xe2/0x2b0 mm/slub.c:4333 memdup_user+0x22/0xb0 mm/util.c:164 fuzzer_ioctl_ep0_write drivers/usb/gadget/fuzzer/fuzzer.c:880 [inline] fuzzer_ioctl+0x1ac/0x1d50 drivers/usb/gadget/fuzzer/fuzzer.c:1205 full_proxy_unlocked_ioctl+0x111/0x180 fs/debugfs/file.c:205 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0xcda/0x12e0 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+0xb7/0x560 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 1751: save_stack+0x1b/0x80 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_slab_free+0x130/0x180 mm/kasan/common.c:451 slab_free_hook mm/slub.c:1421 [inline] slab_free_freelist_hook mm/slub.c:1448 [inline] slab_free mm/slub.c:2994 [inline] kfree+0xd7/0x280 mm/slub.c:3949 gadget_ep0_complete+0x17b/0x560 drivers/usb/gadget/fuzzer/fuzzer.c:471 transfer drivers/usb/gadget/udc/dummy_hcd.c:1495 [inline] dummy_timer+0x162a/0x2df4 drivers/usb/gadget/udc/dummy_hcd.c:1949 call_timer_fn+0x15e/0x5e0 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers kernel/time/timer.c:1685 [inline] __run_timers kernel/time/timer.c:1653 [inline] run_timer_softirq+0x597/0x1410 kernel/time/timer.c:1698 __do_softirq+0x219/0x8b0 kernel/softirq.c:292 The buggy address belongs to the object at ffff8881d3e3ee88 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 0 bytes inside of 8-byte region [ffff8881d3e3ee88, ffff8881d3e3ee90) The buggy address belongs to the page: page:ffffea00074f8f80 refcount:1 mapcount:0 mapping:ffff8881dac03c00 index:0x0 flags: 0x200000000000200(slab) raw: 0200000000000200 ffffea00074d0ac0 0000001200000012 ffff8881dac03c00 raw: 0000000000000000 0000000080aa00aa 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881d3e3ed80: fb fc fc fb fc fc fb fc fc fb fc fc fb fc fc fb ffff8881d3e3ee00: fc fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc >ffff8881d3e3ee80: fc fb fc fc fb fc fc 00 fc fc fb fc fc 00 fc fc ^ ffff8881d3e3ef00: fb fc fc fb fc fc fb fc fc fb fc fc fb fc fc fb ffff8881d3e3ef80: fc fc fb fc fc fb fc fc fb fc fc fb fc fc fc fc ==================================================================