================================================================== BUG: KASAN: use-after-free in __mutex_lock_common+0x118/0x2400 kernel/locking/mutex.c:575 Read of size 8 at addr ffff88802afeac60 by task syz-executor/5365 CPU: 1 PID: 5365 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 __mutex_lock_common+0x118/0x2400 kernel/locking/mutex.c:575 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_interruptible_nested+0x17/0x20 kernel/locking/mutex.c:765 ep_open+0x4a/0x260 drivers/usb/gadget/legacy/inode.c:822 do_dentry_open+0x7f7/0xf90 fs/open.c:826 do_open fs/namei.c:3659 [inline] path_openat+0x2718/0x2fb0 fs/namei.c:3793 do_filp_open+0x1df/0x400 fs/namei.c:3820 do_sys_openat2+0x14b/0x500 fs/open.c:1255 do_sys_open fs/open.c:1271 [inline] __do_sys_openat fs/open.c:1287 [inline] __se_sys_openat fs/open.c:1282 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1282 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f4f3cc4498e Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08 RSP: 002b:00007ffca96dd868 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 000055556ef7b500 RCX: 00007f4f3cc4498e RDX: 0000000000000000 RSI: 00007ffca96dd9d0 RDI: ffffffffffffff9c RBP: 00007ffca96dd9d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffca96deac0 R13: 00007f4f3cd1a4bb R14: 000055556ef7b4e8 R15: 0000000000000006 Allocated by task 5877: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc+0xaf/0xe0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:607 [inline] kzalloc include/linux/slab.h:738 [inline] activate_ep_files drivers/usb/gadget/legacy/inode.c:1600 [inline] gadgetfs_bind+0x25b/0x820 drivers/usb/gadget/legacy/inode.c:1691 udc_bind_to_driver+0x203/0x5f0 drivers/usb/gadget/udc/core.c:1574 usb_gadget_probe_driver+0x1fb/0x380 drivers/usb/gadget/udc/core.c:1637 dev_config+0xe3c/0x1250 drivers/usb/gadget/legacy/inode.c:1882 vfs_write+0x304/0xd70 fs/read_write.c:592 ksys_write+0x153/0x260 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 21: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1710 [inline] slab_free_freelist_hook+0xec/0x170 mm/slub.c:1736 slab_free mm/slub.c:3504 [inline] kfree+0xef/0x2a0 mm/slub.c:4564 destroy_ep_files+0x280/0x340 drivers/usb/gadget/legacy/inode.c:1575 gadgetfs_unbind+0x105/0x2a0 drivers/usb/gadget/legacy/inode.c:1654 usb_gadget_remove_driver+0x15c/0x350 drivers/usb/gadget/udc/core.c:1495 usb_gadget_unregister_driver+0x15d/0x4c0 drivers/usb/gadget/udc/core.c:1654 dev_release+0x82/0x1f0 drivers/usb/gadget/legacy/inode.c:1197 __fput+0x212/0x8c0 fs/file_table.c:311 delayed_fput+0x54/0x80 fs/file_table.c:334 process_one_work+0x867/0xff0 kernel/workqueue.c:2310 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457 kthread+0x42e/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the object at ffff88802afeac00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 96 bytes inside of 512-byte region [ffff88802afeac00, ffff88802afeae00) The buggy address belongs to the page: page:ffffea0000abfa00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2afe8 head:ffffea0000abfa00 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888016c41c80 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2866, ts 17350836683, free_ts 17317578239 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x24f6/0x2670 mm/page_alloc.c:4192 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501 alloc_slab_page mm/slub.c:1780 [inline] allocate_slab mm/slub.c:1917 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1980 ___slab_alloc+0x807/0xdd0 mm/slub.c:3013 __slab_alloc mm/slub.c:3100 [inline] slab_alloc_node mm/slub.c:3191 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc_trace+0xf9/0x290 mm/slub.c:3250 kmalloc include/linux/slab.h:607 [inline] kzalloc include/linux/slab.h:738 [inline] alloc_bprm+0x56/0x690 fs/exec.c:1516 kernel_execve+0x49/0x8e0 fs/exec.c:1978 call_usermodehelper_exec_async+0x207/0x350 kernel/umh.c:112 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page+0x8f/0x2a0 mm/page_alloc.c:3396 stack_depot_save+0x42f/0x460 lib/stackdepot.c:335 kasan_save_stack mm/kasan/common.c:40 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0xa9/0xc0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3225 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc+0x15d/0x280 mm/slub.c:3238 kmem_cache_zalloc include/linux/slab.h:728 [inline] fill_pool lib/debugobjects.c:172 [inline] __debug_object_init+0x8e5/0xc80 lib/debugobjects.c:615 call_usermodehelper_setup+0xa5/0x260 kernel/umh.c:369 kobject_uevent_env+0x658/0x890 lib/kobject_uevent.c:629 device_del+0x8e5/0xa80 drivers/base/core.c:3637 cdev_device_del+0x23/0xf0 fs/char_dev.c:573 cec_devnode_unregister drivers/media/cec/core/cec-core.c:184 [inline] cec_unregister_adapter+0x1d6/0x260 drivers/media/cec/core/cec-core.c:394 vivid_create_instance drivers/media/test-drivers/vivid/vivid-core.c:2000 [inline] vivid_probe+0x3afb/0x6240 drivers/media/test-drivers/vivid/vivid-core.c:2031 platform_probe+0x137/0x1c0 drivers/base/platform.c:1391 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x276/0xc70 drivers/base/dd.c:595 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:775 Memory state around the buggy address: ffff88802afeab00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802afeab80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802afeac00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802afeac80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802afead00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================