================================================================== BUG: KASAN: use-after-free in string_nocheck lib/vsprintf.c:643 [inline] BUG: KASAN: use-after-free in string+0x218/0x2b0 lib/vsprintf.c:725 Read of size 1 at addr ffff888021e06e40 by task udevd/2998 CPU: 0 PID: 2998 Comm: udevd Not tainted 6.1.20-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15f/0x4f0 mm/kasan/report.c:395 kasan_report+0x136/0x160 mm/kasan/report.c:495 string_nocheck lib/vsprintf.c:643 [inline] string+0x218/0x2b0 lib/vsprintf.c:725 vsnprintf+0x11fc/0x1c70 lib/vsprintf.c:2800 add_uevent_var+0x1c0/0x440 lib/kobject_uevent.c:665 dev_uevent+0x3e8/0x8e0 drivers/base/core.c:2568 uevent_show+0x196/0x300 drivers/base/core.c:2639 dev_attr_show+0x50/0xb0 drivers/base/core.c:2342 sysfs_kf_seq_show+0x32d/0x4b0 fs/sysfs/file.c:59 seq_read_iter+0x43a/0xd10 fs/seq_file.c:230 call_read_iter include/linux/fs.h:2199 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x7de/0xbe0 fs/read_write.c:470 ksys_read+0x19c/0x2c0 fs/read_write.c:613 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fb0023258fe Code: c0 e9 e6 fe ff ff 50 48 8d 3d 0e c7 09 00 e8 c9 cf 01 00 66 0f 1f 84 00 00 00 00 00 64 8b 04 25 18 00 00 00 85 c0 75 14 0f 05 <48> 3d 00 f0 ff ff 77 5a c3 66 0f 1f 84 00 00 00 00 00 48 83 ec 28 RSP: 002b:00007ffd569dc468 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 000055bd446155d0 RCX: 00007fb0023258fe RDX: 0000000000001000 RSI: 000055bd44618e80 RDI: 000000000000000c RBP: 00007fb0023f2380 R08: 000000000000000c R09: 00007fb0023f5a60 R10: 0000000000000800 R11: 0000000000000246 R12: 000055bd446155d0 R13: 0000000000000d68 R14: 00007fb0023f1780 R15: 0000000000000d68 Allocated by task 11172: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:553 [inline] raw_ioctl_init drivers/usb/gadget/legacy/raw_gadget.c:460 [inline] raw_ioctl+0x1ab1/0x3bf0 drivers/usb/gadget/legacy/raw_gadget.c:1250 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 11172: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x25c/0x3c0 mm/slub.c:3674 dev_free drivers/usb/gadget/legacy/raw_gadget.c:210 [inline] kref_put+0xb5/0x7c0 include/linux/kref.h:65 raw_release+0x134/0x1e0 drivers/usb/gadget/legacy/raw_gadget.c:424 __fput+0x3b7/0x890 fs/file_table.c:320 task_work_run+0x246/0x300 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x6fb/0x2300 kernel/exit.c:869 do_group_exit+0x202/0x2b0 kernel/exit.c:1019 get_signal+0x16f7/0x17d0 kernel/signal.c:2858 arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x60/0x2d0 kernel/entry/common.c:296 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888021e06e40 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes inside of 32-byte region [ffff888021e06e40, ffff888021e06e60) The buggy address belongs to the physical page: page:ffffea0000878180 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888021e06ec0 pfn:0x21e06 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00007a7b88 ffffea0001e7c988 ffff888012441500 raw: ffff888021e06ec0 000000000040003f 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid 1 (swapper/0), ts 8045916958, free_ts 6846917462 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x3573/0x3700 mm/page_alloc.c:4291 __alloc_pages+0x28d/0x7e0 mm/page_alloc.c:5558 alloc_page_interleave+0x22/0x1c0 mm/mempolicy.c:2120 alloc_slab_page+0x6a/0x150 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x84/0x2d0 mm/slub.c:1992 ___slab_alloc+0xa71/0x1080 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x19f/0x260 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc+0x9e/0x1a0 mm/slab_common.c:968 kmalloc include/linux/slab.h:558 [inline] kzalloc include/linux/slab.h:689 [inline] rh_call_control drivers/usb/core/hcd.c:514 [inline] rh_urb_enqueue drivers/usb/core/hcd.c:848 [inline] usb_hcd_submit_urb+0x8f5/0x1de0 drivers/usb/core/hcd.c:1552 usb_start_wait_urb+0x10f/0x510 drivers/usb/core/message.c:58 usb_internal_control_msg drivers/usb/core/message.c:102 [inline] usb_control_msg+0x2ad/0x4c0 drivers/usb/core/message.c:153 usb_get_descriptor+0xb3/0x3c0 drivers/usb/core/message.c:793 usb_get_configuration+0x37f/0x4d60 drivers/usb/core/config.c:928 usb_enumerate_device drivers/usb/core/hub.c:2407 [inline] usb_new_device+0x146/0x18e0 drivers/usb/core/hub.c:2545 register_root_hub+0x271/0x560 drivers/usb/core/hcd.c:1017 usb_add_hcd+0xc4e/0x1250 drivers/usb/core/hcd.c:2991 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare mm/page_alloc.c:1509 [inline] free_unref_page_prepare+0xfe1/0x1190 mm/page_alloc.c:3387 free_unref_page+0x98/0x570 mm/page_alloc.c:3483 __vunmap+0x834/0x9a0 mm/vmalloc.c:2713 free_work+0x57/0x80 mm/vmalloc.c:97 process_one_work+0x909/0x1380 kernel/workqueue.c:2289 worker_thread+0xa5f/0x1210 kernel/workqueue.c:2436 kthread+0x268/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Memory state around the buggy address: ffff888021e06d00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ffff888021e06d80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc >ffff888021e06e00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ^ ffff888021e06e80: fa fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff888021e06f00: 00 00 02 fc fc fc fc fc 00 00 03 fc fc fc fc fc ==================================================================