================================================================== BUG: KASAN: slab-use-after-free in i2c_adapter_depth drivers/i2c/i2c-core-base.c:1244 [inline] BUG: KASAN: slab-use-after-free in i2c_adapter_lock_bus+0xe0/0x100 drivers/i2c/i2c-core-base.c:850 Read of size 8 at addr ffff88802b42b108 by task syz.6.2550/17835 CPU: 0 UID: 0 PID: 17835 Comm: syz.6.2550 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x13d/0x4b0 mm/kasan/report.c:482 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595 i2c_adapter_depth drivers/i2c/i2c-core-base.c:1244 [inline] i2c_adapter_lock_bus+0xe0/0x100 drivers/i2c/i2c-core-base.c:850 i2c_lock_bus include/linux/i2c.h:809 [inline] __i2c_lock_bus_helper drivers/i2c/i2c-core.h:47 [inline] i2c_transfer+0x234/0x380 drivers/i2c/i2c-core-base.c:2340 i2cdev_ioctl_rdwr+0x3ec/0x700 drivers/i2c/i2c-dev.c:306 i2cdev_ioctl+0x19d/0x830 drivers/i2c/i2c-dev.c:467 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9b99b9e0d9 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:00007f9b97df6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f9b99e25fa0 RCX: 00007f9b99b9e0d9 RDX: 00002000000003c0 RSI: 0000000000000707 RDI: 0000000000000007 RBP: 00007f9b99c35024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9b99e26038 R14: 00007f9b99e25fa0 R15: 00007fffbe59bc58 Allocated by task 17710: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5337 [inline] __kmalloc_node_track_caller_noprof+0x333/0x830 mm/slub.c:5466 kmalloc_reserve+0xe8/0x350 net/core/skbuff.c:637 __alloc_skb+0x185/0x710 net/core/skbuff.c:715 alloc_skb include/linux/skbuff.h:1384 [inline] nlmsg_new include/net/netlink.h:1055 [inline] audit_buffer_alloc kernel/audit.c:1846 [inline] audit_log_start+0x350/0x930 kernel/audit.c:1965 common_lsm_audit+0xb2/0x2b0 security/lsm_audit.c:442 slow_avc_audit+0x186/0x210 security/selinux/avc.c:778 audit_inode_permission+0x1ea/0x2a0 security/selinux/hooks.c:3151 selinux_inode_permission+0x7ed/0x1130 security/selinux/hooks.c:3293 security_inode_permission+0xda/0x250 security/security.c:1842 lookup_inode_permission_may_exec fs/namei.c:698 [inline] may_lookup fs/namei.c:1961 [inline] link_path_walk+0x2a5/0x1cc0 fs/namei.c:2604 path_openat+0x1ac/0x2440 fs/namei.c:4996 do_file_open+0x20e/0x430 fs/namei.c:5029 do_sys_openat2+0x10f/0x1e0 fs/open.c:1417 do_sys_open fs/open.c:1423 [inline] __do_sys_openat fs/open.c:1439 [inline] __se_sys_openat fs/open.c:1434 [inline] __x64_sys_openat+0x12d/0x210 fs/open.c:1434 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 30: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2678 [inline] slab_free mm/slub.c:6372 [inline] kfree+0x22b/0x6c0 mm/slub.c:6687 skb_kfree_head net/core/skbuff.c:1083 [inline] skb_free_head+0xb9/0x160 net/core/skbuff.c:1095 skb_release_data+0x6c5/0x8e0 net/core/skbuff.c:1122 skb_release_all net/core/skbuff.c:1197 [inline] __kfree_skb net/core/skbuff.c:1211 [inline] sk_skb_reason_drop+0x102/0x1b0 net/core/skbuff.c:1250 kfree_skb_reason include/linux/skbuff.h:1323 [inline] kfree_skb include/linux/skbuff.h:1332 [inline] kauditd_hold_skb+0x144/0x210 kernel/audit.c:653 kauditd_send_queue+0x232/0x2e0 kernel/audit.c:808 kauditd_thread+0x645/0xb30 kernel/audit.c:932 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff88802b42b000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 264 bytes inside of freed 2048-byte region [ffff88802b42b000, ffff88802b42b800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2b428 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801c02c000 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800080008 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801c02c000 dead000000000100 dead000000000122 head: 0000000000000000 0000000800080008 00000000f5000000 0000000000000000 head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 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 5711462839 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x110d/0x35b0 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x2eb/0x3300 mm/page_alloc.c:5436 alloc_slab_page mm/slub.c:3267 [inline] allocate_slab mm/slub.c:3382 [inline] new_slab+0xa5/0x640 mm/slub.c:3428 refill_objects+0xe3/0x410 mm/slub.c:7305 refill_sheaf mm/slub.c:2805 [inline] __pcs_replace_empty_main+0x372/0x680 mm/slub.c:4677 alloc_from_pcs mm/slub.c:4775 [inline] slab_alloc_node mm/slub.c:4907 [inline] __kmalloc_cache_noprof+0x47b/0x6b0 mm/slub.c:5480 _kmalloc_noprof include/linux/slab.h:988 [inline] _kzalloc_noprof include/linux/slab.h:1309 [inline] usb_alloc_dev+0x55/0x1090 drivers/usb/core/usb.c:651 usb_add_hcd.cold+0x257/0x1158 drivers/usb/core/hcd.c:2880 dummy_hcd_probe+0x189/0x2fa drivers/usb/gadget/udc/dummy_hcd.c:2722 platform_probe+0x106/0x1d0 drivers/base/platform.c:1507 call_driver_probe drivers/base/dd.c:628 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:706 __driver_probe_device+0x210/0x460 drivers/base/dd.c:868 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898 __device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500 page_owner free stack trace missing Memory state around the buggy address: ffff88802b42b000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802b42b080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802b42b100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802b42b180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802b42b200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================