================================================================== BUG: KASAN: slab-use-after-free in i2c_adapter_depth drivers/i2c/i2c-core-base.c:1243 [inline] BUG: KASAN: slab-use-after-free in i2c_adapter_lock_bus+0x5e/0xf0 drivers/i2c/i2c-core-base.c:849 Read of size 8 at addr ffff888029f3c108 by task syz.5.3473/3098 CPU: 0 UID: 0 PID: 3098 Comm: syz.5.3473 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)} Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 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 i2c_adapter_depth drivers/i2c/i2c-core-base.c:1243 [inline] i2c_adapter_lock_bus+0x5e/0xf0 drivers/i2c/i2c-core-base.c:849 i2c_lock_bus include/linux/i2c.h:809 [inline] __i2c_lock_bus_helper drivers/i2c/i2c-core.h:47 [inline] i2c_transfer+0xc8/0x2d0 drivers/i2c/i2c-core-base.c:2339 i2cdev_ioctl_rdwr+0x460/0x740 drivers/i2c/i2c-dev.c:306 i2cdev_ioctl+0x6a8/0x890 drivers/i2c/i2c-dev.c:467 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xff/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x17b/0x530 arch/x86/entry/syscall_64.c:85 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f126805e0d9 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:00007f12662b6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f12682e5fa0 RCX: 00007f126805e0d9 RDX: 0000200000002300 RSI: 0000000000000707 RDI: 0000000000000008 RBP: 00007f12680f5024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f12682e6038 R14: 00007f12682e5fa0 R15: 00007ffde00bbc08 Allocated by task 1854: 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:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5339 [inline] __kmalloc_noprof+0x415/0x790 mm/slub.c:5364 _kmalloc_noprof include/linux/slab.h:973 [inline] tomoyo_realpath_from_path+0xef/0x640 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x283/0x560 security/tomoyo/file.c:827 security_inode_getattr+0x121/0x2d0 security/security.c:1895 vfs_getattr+0x23/0x70 fs/stat.c:259 vfs_statx_path+0x2b/0x230 fs/stat.c:299 vfs_statx+0x12e/0x200 fs/stat.c:356 vfs_fstatat+0x11b/0x170 fs/stat.c:373 __do_sys_newfstatat fs/stat.c:538 [inline] __se_sys_newfstatat fs/stat.c:532 [inline] __x64_sys_newfstatat+0x151/0x200 fs/stat.c:532 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x17b/0x530 arch/x86/entry/syscall_64.c:85 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 1854: 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:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2706 [inline] slab_free mm/slub.c:6388 [inline] kfree+0x1c5/0x6c0 mm/slub.c:6703 tomoyo_realpath_from_path+0x605/0x640 security/tomoyo/realpath.c:286 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x283/0x560 security/tomoyo/file.c:827 security_inode_getattr+0x121/0x2d0 security/security.c:1895 vfs_getattr+0x23/0x70 fs/stat.c:259 vfs_statx_path+0x2b/0x230 fs/stat.c:299 vfs_statx+0x12e/0x200 fs/stat.c:356 vfs_fstatat+0x11b/0x170 fs/stat.c:373 __do_sys_newfstatat fs/stat.c:538 [inline] __se_sys_newfstatat fs/stat.c:532 [inline] __x64_sys_newfstatat+0x151/0x200 fs/stat.c:532 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x17b/0x530 arch/x86/entry/syscall_64.c:85 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888029f3c000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 264 bytes inside of freed 4096-byte region [ffff888029f3c000, ffff888029f3d000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29f38 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x80000000000040(head|node=0|zone=1) page_type: f5(slab) raw: 0080000000000040 ffff88813fe3c140 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800040004 00000000f5000000 0000000000000000 head: 0080000000000040 ffff88813fe3c140 dead000000000100 dead000000000122 head: 0000000000000000 0000000800040004 00000000f5000000 0000000000000000 head: 0080000000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 11536276673 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x264c/0x26c0 mm/page_alloc.c:3955 __alloc_frozen_pages_noprof+0x222/0x5b0 mm/page_alloc.c:5394 alloc_slab_page mm/slub.c:3295 [inline] allocate_slab+0x7c/0x5e0 mm/slub.c:3410 new_slab mm/slub.c:3456 [inline] refill_objects+0x2d8/0x350 mm/slub.c:7321 refill_sheaf mm/slub.c:2833 [inline] __pcs_replace_empty_main+0x330/0x690 mm/slub.c:4699 alloc_from_pcs mm/slub.c:4775 [inline] slab_alloc_node mm/slub.c:4909 [inline] __kmalloc_cache_noprof+0x467/0x670 mm/slub.c:5482 _kmalloc_noprof include/linux/slab.h:969 [inline] _kzalloc_noprof include/linux/slab.h:1290 [inline] kobject_uevent_env+0x28c/0x9e0 lib/kobject_uevent.c:543 device_add+0x544/0xb80 drivers/base/core.c:3738 device_create_groups_vargs drivers/base/core.c:4454 [inline] device_create+0x269/0x300 drivers/base/core.c:4493 mon_bin_add+0xb6/0x130 drivers/usb/mon/mon_bin.c:1371 mon_bus_init+0x173/0x2b0 drivers/usb/mon/mon_main.c:291 mon_bus_add drivers/usb/mon/mon_main.c:188 [inline] mon_notify+0x10c/0x3f0 drivers/usb/mon/mon_main.c:219 notifier_call_chain+0x1a5/0x3d0 kernel/notifier.c:85 blocking_notifier_call_chain+0x6a/0x90 kernel/notifier.c:380 usb_register_bus+0xcf/0x150 drivers/usb/core/hcd.c:904 page last free pid 10 tgid 10 ts 11535672894 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] free_pages_prepare+0x9c0/0xac0 mm/page_alloc.c:1463 __free_contig_range_common+0x174/0x340 mm/page_alloc.c:7019 __free_contig_range mm/page_alloc.c:7064 [inline] free_pages_bulk+0x48/0x120 mm/page_alloc.c:5280 vm_area_free_pages mm/vmalloc.c:3500 [inline] vfree+0x26f/0x510 mm/vmalloc.c:3549 delayed_vfree_work+0x55/0x80 mm/vmalloc.c:3453 process_one_work+0xaaf/0x1480 kernel/workqueue.c:3379 process_scheduled_works kernel/workqueue.c:3462 [inline] worker_thread+0xb05/0x10d0 kernel/workqueue.c:3543 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff888029f3c000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888029f3c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888029f3c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888029f3c180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888029f3c200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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