================================================================== BUG: KASAN: slab-use-after-free in __mutex_lock_common kernel/locking/rtmutex_api.c:561 [inline] BUG: KASAN: slab-use-after-free in mutex_lock_interruptible_nested+0x55/0x1c0 kernel/locking/rtmutex_api.c:594 Read of size 1 at addr ffff88803043b458 by task syz.7.1595/13003 CPU: 1 UID: 0 PID: 13003 Comm: syz.7.1595 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 __kasan_check_byte+0x2a/0x40 mm/kasan/common.c:585 kasan_check_byte include/linux/kasan.h:402 [inline] lock_acquire+0x7d/0x350 kernel/locking/lockdep.c:5916 __mutex_lock_common kernel/locking/rtmutex_api.c:561 [inline] mutex_lock_interruptible_nested+0x55/0x1c0 kernel/locking/rtmutex_api.c:594 ep_open+0x4e/0x270 drivers/usb/gadget/legacy/inode.c:953 do_dentry_open+0x841/0x1410 fs/open.c:1000 vfs_open_consume+0x4a/0x360 fs/open.c:1131 do_open fs/namei.c:4851 [inline] path_openat+0x1701/0x2100 fs/namei.c:5016 do_file_open+0x23e/0x4a0 fs/namei.c:5045 do_sys_openat2+0x115/0x200 fs/open.c:1442 do_sys_open fs/open.c:1448 [inline] __do_sys_openat fs/open.c:1464 [inline] __se_sys_openat fs/open.c:1459 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1459 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0610eefb19 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f060f0fc028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f0611176180 RCX: 00007f0610eefb19 RDX: 0000000000000002 RSI: 0000200000000b40 RDI: ffffffffffffff9c RBP: 00007f0610f87b70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0611176218 R14: 00007f0611176180 R15: 00007ffcbd581fe8 Allocated by task 13001: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x3d0/0x670 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+0x2f5/0xb20 drivers/usb/gadget/legacy/inode.c:1825 gadget_bind_driver+0x2ca/0x9e0 drivers/usb/gadget/udc/core.c:1663 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x254/0xae0 drivers/base/dd.c:707 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:869 driver_probe_device+0x4f/0x240 drivers/base/dd.c:899 __driver_attach+0x34e/0x630 drivers/base/dd.c:1300 bus_for_each_dev+0x23e/0x2c0 drivers/base/bus.c:383 bus_add_driver+0x392/0x6e0 drivers/base/bus.c:782 driver_register+0x23a/0x320 drivers/base/driver.c:174 usb_gadget_register_driver_owner+0xf9/0x270 drivers/usb/gadget/udc/core.c:1753 dev_config+0xe4e/0x12c0 drivers/usb/gadget/legacy/inode.c:2015 vfs_write+0x29f/0xbb0 fs/read_write.c:685 ksys_write+0x156/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 12996: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:264 [inline] __kasan_slab_free+0x5c/0x80 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+0x1c5/0x6d0 mm/slub.c:6923 destroy_ep_files+0x2a3/0x330 drivers/usb/gadget/legacy/inode.c:1713 gadgetfs_unbind+0x112/0x2c0 drivers/usb/gadget/legacy/inode.c:1786 gadget_unbind_driver+0x1cb/0x410 drivers/usb/gadget/udc/core.c:1725 device_remove drivers/base/dd.c:617 [inline] __device_release_driver drivers/base/dd.c:1357 [inline] device_release_driver_internal+0x42b/0x7d0 drivers/base/dd.c:1380 driver_detach+0x1f3/0x2d0 drivers/base/dd.c:1443 bus_remove_driver+0x229/0x320 drivers/base/bus.c:851 usb_gadget_unregister_driver+0x4e/0x70 drivers/usb/gadget/udc/core.c:1785 dev_release+0x86/0x210 drivers/usb/gadget/legacy/inode.c:1328 __fput+0x41a/0xa70 fs/file_table.c:512 fput_close_sync+0x11f/0x240 fs/file_table.c:618 filp_close_sync+0x6e/0xa0 fs/open.c:1573 __range_close fs/file.c:919 [inline] __do_sys_close_range fs/file.c:1003 [inline] __se_sys_close_range+0xa7d/0xef0 fs/file.c:954 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88803043b400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 88 bytes inside of freed 512-byte region [ffff88803043b400, ffff88803043b600) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x30438 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x80000000000040(head|node=0|zone=1) page_type: f5(slab) raw: 0080000000000040 ffff88813ff13c80 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 0080000000000040 ffff88813ff13c80 dead000000000100 dead000000000122 head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 0080000000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000004 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 1, tgid 1 (swapper/0), ts 18212977091 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1856 prep_new_page mm/page_alloc.c:1864 [inline] get_page_from_freelist+0x258b/0x2600 mm/page_alloc.c:3935 __alloc_frozen_pages_noprof+0x227/0x440 mm/page_alloc.c:5444 alloc_slab_page mm/slub.c:3384 [inline] allocate_slab+0x7d/0x5e0 mm/slub.c:3499 new_slab mm/slub.c:3550 [inline] refill_objects+0x2d8/0x350 mm/slub.c:7539 refill_sheaf mm/slub.c:2917 [inline] __pcs_replace_empty_main+0x339/0x690 mm/slub.c:4811 alloc_from_pcs mm/slub.c:4887 [inline] slab_alloc_node mm/slub.c:5021 [inline] __do_kmalloc_node mm/slub.c:5530 [inline] __kvmalloc_node_noprof+0x6ef/0x880 mm/slub.c:7136 v4l2_ctrl_new+0x103c/0x1820 drivers/media/v4l2-core/v4l2-ctrls-core.c:2263 v4l2_ctrl_new_custom+0x5b4/0x7f0 drivers/media/v4l2-core/v4l2-ctrls-core.c:2349 vivid_create_controls+0xda9/0x3c40 drivers/media/test-drivers/vivid/vivid-ctrls.c:1738 vivid_create_instance drivers/media/test-drivers/vivid/vivid-core.c:1934 [inline] vivid_probe+0x4112/0x70d0 drivers/media/test-drivers/vivid/vivid-core.c:2096 platform_probe+0xf9/0x190 drivers/base/platform.c:1508 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x254/0xae0 drivers/base/dd.c:707 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:869 driver_probe_device+0x4f/0x240 drivers/base/dd.c:899 __driver_attach+0x34e/0x630 drivers/base/dd.c:1300 page_owner free stack trace missing Memory state around the buggy address: ffff88803043b300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88803043b380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88803043b400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88803043b480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803043b500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================