================================================================== BUG: KASAN: slab-use-after-free in string_nocheck lib/vsprintf.c:644 [inline] BUG: KASAN: slab-use-after-free in string+0x2b0/0x2dc lib/vsprintf.c:726 Read of size 1 at addr ffff0000157ab900 by task udevd/2892 CPU: 1 PID: 2892 Comm: udevd Not tainted 6.4.0-rc1-syzkaller-00177-gbb7c241fae62 #0 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0x9c/0x11c arch/arm64/kernel/stacktrace.c:233 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x74/0xd4 lib/dump_stack.c:106 print_address_description.constprop.0+0x58/0x39c mm/kasan/report.c:351 print_report mm/kasan/report.c:462 [inline] kasan_report+0x10c/0x138 mm/kasan/report.c:572 __asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378 string_nocheck lib/vsprintf.c:644 [inline] string+0x2b0/0x2dc lib/vsprintf.c:726 vsnprintf+0x4b4/0xe4c lib/vsprintf.c:2817 add_uevent_var+0x130/0x318 lib/kobject_uevent.c:665 dev_uevent+0x158/0x5a0 drivers/base/core.c:2575 uevent_show+0x148/0x2f0 drivers/base/core.c:2646 dev_attr_show+0x48/0xcc drivers/base/core.c:2349 sysfs_kf_seq_show+0x1b0/0x338 fs/sysfs/file.c:59 kernfs_seq_show+0x104/0x154 fs/kernfs/file.c:205 seq_read_iter+0x348/0xdc4 fs/seq_file.c:230 kernfs_fop_read_iter+0x300/0x464 fs/kernfs/file.c:279 call_read_iter include/linux/fs.h:1862 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x480/0x6f4 fs/read_write.c:470 ksys_read+0xec/0x1d0 fs/read_write.c:613 __do_sys_read fs/read_write.c:623 [inline] __se_sys_read fs/read_write.c:621 [inline] __arm64_sys_read+0x6c/0x9c fs/read_write.c:621 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x6c/0x260 arch/arm64/kernel/syscall.c:52 el0_svc_common.constprop.0+0xc4/0x254 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x50/0x124 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x130 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0xb8/0xbc arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Allocated by task 8462: kasan_save_stack+0x2c/0x54 mm/kasan/common.c:45 kasan_set_track+0x2c/0x40 mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x34 mm/kasan/generic.c:510 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:196 [inline] kmalloc_trace+0x74/0x88 mm/slab_common.c:1062 kmalloc include/linux/slab.h:559 [inline] raw_ioctl_init+0x1dc/0x724 drivers/usb/gadget/legacy/raw_gadget.c:460 raw_ioctl+0xab0/0x2654 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 fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x120/0x18c fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x6c/0x260 arch/arm64/kernel/syscall.c:52 el0_svc_common.constprop.0+0xc4/0x254 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x50/0x124 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x130 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0xb8/0xbc arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Freed by task 8461: kasan_save_stack+0x2c/0x54 mm/kasan/common.c:45 kasan_set_track+0x2c/0x40 mm/kasan/common.c:52 kasan_save_free_info+0x38/0x60 mm/kasan/generic.c:521 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x120/0x1b8 mm/kasan/common.c:200 __kasan_slab_free+0x18/0x24 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook mm/slub.c:1807 [inline] slab_free mm/slub.c:3786 [inline] __kmem_cache_free+0xac/0x3cc mm/slub.c:3799 kfree+0xbc/0x1b0 mm/slab_common.c:1015 dev_free+0x84/0x5b0 drivers/usb/gadget/legacy/raw_gadget.c:210 kref_put include/linux/kref.h:65 [inline] raw_release+0x12c/0x260 drivers/usb/gadget/legacy/raw_gadget.c:424 __fput+0x1ac/0x860 fs/file_table.c:321 ____fput+0x10/0x1c fs/file_table.c:349 task_work_run+0x124/0x20c kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x908/0x26b4 arch/arm64/kernel/signal.c:1304 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x10c/0x130 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0xb8/0xbc arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Last potentially related work creation: kasan_save_stack+0x2c/0x54 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb8/0xe8 mm/kasan/generic.c:491 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:501 kvfree_call_rcu+0x88/0x938 kernel/rcu/tree.c:3332 kernfs_unlink_open_file+0x2bc/0x37c fs/kernfs/file.c:633 kernfs_fop_release+0xac/0x194 fs/kernfs/file.c:805 __fput+0x1ac/0x860 fs/file_table.c:321 ____fput+0x10/0x1c fs/file_table.c:349 task_work_run+0x124/0x20c kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x908/0x26b4 arch/arm64/kernel/signal.c:1304 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x10c/0x130 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0xb8/0xbc arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 The buggy address belongs to the object at ffff0000157ab900 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 0 bytes inside of freed 128-byte region [ffff0000157ab900, ffff0000157ab980) The buggy address belongs to the physical page: page:000000002345b620 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x557ab flags: 0x1ffc00000000200(slab|node=0|zone=0|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 01ffc00000000200 ffff000009802300 fffffc000058f280 dead000000000002 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000157ab800: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ffff0000157ab880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000157ab900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000157ab980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000157aba00: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================