================================================================== BUG: KASAN: slab-use-after-free in __mutex_lock_common kernel/locking/mutex.c:625 [inline] BUG: KASAN: slab-use-after-free in __mutex_lock+0x130/0x10b8 kernel/locking/mutex.c:821 Read of size 8 at addr ffff0000cd4a2058 by task syz-executor/4729 CPU: 1 UID: 0 PID: 4729 Comm: syz-executor Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xb0/0x238 mm/kasan/report.c:378 print_report+0x68/0x84 mm/kasan/report.c:482 kasan_report+0x8c/0xc4 mm/kasan/report.c:595 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 __mutex_lock_common kernel/locking/mutex.c:625 [inline] __mutex_lock+0x130/0x10b8 kernel/locking/mutex.c:821 mutex_lock_interruptible_nested+0x24/0x30 kernel/locking/mutex.c:899 ep_open+0x58/0x25c drivers/usb/gadget/legacy/inode.c:953 do_dentry_open+0x5bc/0xfb4 fs/open.c:1000 vfs_open_consume+0x54/0x2ec fs/open.c:1131 do_open fs/namei.c:4851 [inline] path_openat+0x1098/0x1910 fs/namei.c:5016 do_file_open+0x1c8/0x2e8 fs/namei.c:5045 do_sys_openat2+0x114/0x1ec fs/open.c:1442 do_sys_open+0xb0/0xe0 fs/open.c:1448 __do_sys_openat fs/open.c:1464 [inline] __se_sys_openat fs/open.c:1459 [inline] __arm64_sys_openat+0xa8/0xc4 fs/open.c:1459 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:797 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:816 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 Allocated by task 5625: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:78 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:570 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x2f4/0x5fc mm/slub.c:5680 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] activate_ep_files drivers/usb/gadget/legacy/inode.c:1732 [inline] gadgetfs_bind+0x268/0x780 drivers/usb/gadget/legacy/inode.c:1825 gadget_bind_driver+0x274/0x834 drivers/usb/gadget/udc/core.c:1663 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x29c/0x800 drivers/base/dd.c:707 __driver_probe_device+0x1e0/0x350 drivers/base/dd.c:869 driver_probe_device+0x6c/0x19c drivers/base/dd.c:899 __driver_attach+0x168/0x384 drivers/base/dd.c:1300 bus_for_each_dev+0x128/0x1b4 drivers/base/bus.c:383 driver_attach+0x50/0x60 drivers/base/dd.c:1318 bus_add_driver+0x234/0x544 drivers/base/bus.c:782 driver_register+0x220/0x310 drivers/base/driver.c:174 usb_gadget_register_driver_owner+0xf0/0x25c drivers/usb/gadget/udc/core.c:1753 dev_config+0x91c/0xcc0 drivers/usb/gadget/legacy/inode.c:2015 vfs_write+0x2a4/0xa0c fs/read_write.c:685 ksys_write+0x12c/0x228 fs/read_write.c:739 __do_sys_write fs/read_write.c:750 [inline] __se_sys_write fs/read_write.c:747 [inline] __arm64_sys_write+0x84/0x98 fs/read_write.c:747 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:797 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:816 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 Freed by task 5634: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:78 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:264 [inline] __kasan_slab_free+0x74/0xa4 mm/kasan/common.c:296 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2780 [inline] slab_free mm/slub.c:6630 [inline] kfree+0x188/0x658 mm/slub.c:6923 put_ep+0xd0/0x144 drivers/usb/gadget/legacy/inode.c:225 destroy_ep_files+0x244/0x2dc drivers/usb/gadget/legacy/inode.c:1713 gadgetfs_unbind+0x114/0x1f0 drivers/usb/gadget/legacy/inode.c:1786 gadget_unbind_driver+0x188/0x790 drivers/usb/gadget/udc/core.c:1725 device_remove+0xc4/0x134 drivers/base/dd.c:617 __device_release_driver drivers/base/dd.c:1357 [inline] device_release_driver_internal+0x124/0x20c drivers/base/dd.c:1380 driver_detach+0x124/0x1b4 drivers/base/dd.c:1443 bus_remove_driver+0x124/0x22c drivers/base/bus.c:851 driver_unregister+0x78/0xac drivers/base/driver.c:202 usb_gadget_unregister_driver+0x50/0x78 drivers/usb/gadget/udc/core.c:1785 dev_release+0x8c/0x15c drivers/usb/gadget/legacy/inode.c:1328 __fput+0x338/0x74c fs/file_table.c:512 fput_close_sync+0x10c/0x278 fs/file_table.c:618 filp_close_sync+0x7c/0xb4 fs/open.c:1573 close_files fs/file.c:572 [inline] put_files_struct+0x1a4/0x2e8 fs/file.c:584 switch_files_struct+0x60/0x74 fs/file.c:598 exit_files+0x50/0x68 fs/file.c:604 do_exit+0x55c/0x1a64 kernel/exit.c:977 __do_sys_exit kernel/exit.c:1090 [inline] __se_sys_exit kernel/exit.c:1088 [inline] do_group_exit+0x0/0x238 kernel/exit.c:1088 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:797 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:816 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 The buggy address belongs to the object at ffff0000cd4a2000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 88 bytes inside of freed 512-byte region [ffff0000cd4a2000, ffff0000cd4a2200) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10d4a0 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c0001c80 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 05ffc00000000040 ffff0000c0001c80 dead000000000100 dead000000000122 head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 05ffc00000000002 fffffdffc3352801 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000cd4a1f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000cd4a1f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000cd4a2000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000cd4a2080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000cd4a2100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================