================================================================== BUG: KASAN: use-after-free in __mutex_lock_common+0x10c/0x1f3c kernel/locking/mutex.c:582 Read of size 8 at addr ffff0000f2d9e860 by task syz-executor/7213 CPU: 0 PID: 7213 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 print_address_description+0x88/0x218 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:420 kasan_report+0xa8/0xfc mm/kasan/report.c:524 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351 __mutex_lock_common+0x10c/0x1f3c kernel/locking/mutex.c:582 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_interruptible_nested+0x38/0x44 kernel/locking/mutex.c:821 ep_open+0x58/0x26c drivers/usb/gadget/legacy/inode.c:819 do_dentry_open+0x738/0xf8c fs/open.c:882 vfs_open+0x7c/0x90 fs/open.c:1015 do_open fs/namei.c:3677 [inline] path_openat+0x1fc0/0x27a0 fs/namei.c:3834 do_filp_open+0x198/0x38c fs/namei.c:3861 do_sys_openat2+0x134/0x3fc fs/open.c:1320 do_sys_open fs/open.c:1336 [inline] __do_sys_openat fs/open.c:1352 [inline] __se_sys_openat fs/open.c:1347 [inline] __arm64_sys_openat+0x11c/0x150 fs/open.c:1347 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Allocated by task 7947: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:53 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x7c/0x94 mm/slab_common.c:1031 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] activate_ep_files drivers/usb/gadget/legacy/inode.c:1597 [inline] gadgetfs_bind+0x204/0x7b0 drivers/usb/gadget/legacy/inode.c:1688 gadget_bind_driver+0x26c/0x684 drivers/usb/gadget/udc/core.c:1651 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x3a0/0xac4 drivers/base/dd.c:638 __driver_probe_device+0x1c8/0x368 drivers/base/dd.c:804 driver_probe_device+0x78/0x324 drivers/base/dd.c:834 __driver_attach+0x3bc/0x614 drivers/base/dd.c:1220 bus_for_each_dev+0x148/0x1d0 drivers/base/bus.c:303 driver_attach+0x50/0x60 drivers/base/dd.c:1237 bus_add_driver+0x2c0/0x518 drivers/base/bus.c:620 driver_register+0x200/0x37c drivers/base/driver.c:246 usb_gadget_register_driver_owner+0xf0/0x25c drivers/usb/gadget/udc/core.c:1730 dev_config+0xba8/0xfec drivers/usb/gadget/legacy/inode.c:1879 vfs_write+0x2a8/0x7c8 fs/read_write.c:582 ksys_write+0x12c/0x228 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Freed by task 4468: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:53 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516 ____kasan_slab_free+0x148/0x1b0 mm/kasan/common.c:237 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:245 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1729 [inline] slab_free_freelist_hook+0x16c/0x1e8 mm/slub.c:1755 slab_free mm/slub.c:3687 [inline] __kmem_cache_free+0xbc/0x21c mm/slub.c:3700 kfree+0xd0/0x1a8 mm/slab_common.c:988 put_ep+0xd0/0x144 drivers/usb/gadget/legacy/inode.c:220 destroy_ep_files+0x260/0x31c drivers/usb/gadget/legacy/inode.c:1572 gadgetfs_unbind+0x114/0x2a8 drivers/usb/gadget/legacy/inode.c:1651 gadget_unbind_driver+0x188/0x35c drivers/usb/gadget/udc/core.c:1702 device_remove drivers/base/dd.c:547 [inline] __device_release_driver drivers/base/dd.c:1279 [inline] device_release_driver_internal+0x3d4/0x6e4 drivers/base/dd.c:1305 driver_detach+0x1e8/0x2ac drivers/base/dd.c:1368 bus_remove_driver+0x120/0x240 drivers/base/bus.c:679 driver_unregister+0x78/0xac drivers/base/driver.c:274 usb_gadget_unregister_driver+0x50/0x78 drivers/usb/gadget/udc/core.c:1762 dev_release+0x8c/0x214 drivers/usb/gadget/legacy/inode.c:1194 __fput+0x1b4/0x7b0 fs/file_table.c:320 delayed_fput+0x78/0xa8 fs/file_table.c:343 process_one_work+0x7e4/0x13bc kernel/workqueue.c:2292 worker_thread+0x8cc/0xfe8 kernel/workqueue.c:2439 kthread+0x254/0x2e0 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 The buggy address belongs to the object at ffff0000f2d9e800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 96 bytes inside of 512-byte region [ffff0000f2d9e800, ffff0000f2d9ea00) The buggy address belongs to the physical page: page:0000000039447b83 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x132d9c head:0000000039447b83 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 dead000000000100 dead000000000122 ffff0000c0002600 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f2d9e700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000f2d9e780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000f2d9e800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f2d9e880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f2d9e900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================