================================================================== BUG: KASAN: slab-use-after-free in string_nocheck lib/vsprintf.c:644 [inline] BUG: KASAN: slab-use-after-free in string+0x39c/0x3d0 lib/vsprintf.c:726 Read of size 1 at addr ffff8880216e7d80 by task udevd/4467 CPU: 0 PID: 4467 Comm: udevd Not tainted 6.5.0-rc1-syzkaller-00006-g3f01e9fed845 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:364 print_report mm/kasan/report.c:475 [inline] kasan_report+0x11d/0x130 mm/kasan/report.c:588 string_nocheck lib/vsprintf.c:644 [inline] string+0x39c/0x3d0 lib/vsprintf.c:726 vsnprintf+0xa36/0x1710 lib/vsprintf.c:2817 add_uevent_var+0x161/0x390 lib/kobject_uevent.c:665 dev_uevent+0x191/0x780 drivers/base/core.c:2575 uevent_show+0x1bc/0x380 drivers/base/core.c:2646 dev_attr_show+0x4f/0xd0 drivers/base/core.c:2349 sysfs_kf_seq_show+0x21d/0x430 fs/sysfs/file.c:59 seq_read_iter+0x4f9/0x12d0 fs/seq_file.c:230 kernfs_fop_read_iter+0x4ce/0x690 fs/kernfs/file.c:279 call_read_iter include/linux/fs.h:1865 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x4a8/0x8d0 fs/read_write.c:470 ksys_read+0x122/0x250 fs/read_write.c:613 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f257ad16b6a Code: 00 3d 00 00 41 00 75 0d 50 48 8d 3d 2d 08 0a 00 e8 ea 7d 01 00 31 c0 e9 07 ff ff ff 64 8b 04 25 18 00 00 00 85 c0 75 1b 0f 05 <48> 3d 00 f0 ff ff 76 6c 48 8b 15 8f a2 0d 00 f7 d8 64 89 02 48 83 RSP: 002b:00007ffe17341f78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00005569a6e68130 RCX: 00007f257ad16b6a RDX: 0000000000001000 RSI: 00005569a6e56da0 RDI: 000000000000000c RBP: 00005569a6e68130 R08: 000000000000000c R09: 0000000000000000 R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000003fff R14: 00007ffe17342458 R15: 000000000000000a Allocated by task 26788: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] ____kasan_kmalloc mm/kasan/common.c:333 [inline] __kasan_kmalloc+0xa3/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:582 [inline] raw_ioctl_init+0x152/0x830 drivers/usb/gadget/legacy/raw_gadget.c:460 raw_ioctl+0xc21/0x2af0 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] __x64_sys_ioctl+0x19d/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 26788: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x13b/0x1a0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:162 [inline] __cache_free mm/slab.c:3370 [inline] __do_kmem_cache_free mm/slab.c:3557 [inline] __kmem_cache_free+0xcd/0x2c0 mm/slab.c:3564 dev_free+0x9a/0x700 drivers/usb/gadget/legacy/raw_gadget.c:210 kref_put include/linux/kref.h:65 [inline] raw_release+0x21d/0x2d0 drivers/usb/gadget/legacy/raw_gadget.c:424 __fput+0x40c/0xad0 fs/file_table.c:384 task_work_run+0x16f/0x270 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa9a/0x29a0 kernel/exit.c:874 do_group_exit+0xd4/0x2a0 kernel/exit.c:1024 get_signal+0x249b/0x25f0 kernel/signal.c:2877 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:308 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff8880216e7d80 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes inside of freed 32-byte region [ffff8880216e7d80, ffff8880216e7da0) The buggy address belongs to the physical page: page:ffffea000085b9c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880216e7fc1 pfn:0x216e7 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0x3f() raw: 00fff00000000200 ffff888012840100 ffffea0001d2eb90 ffffea0001cbcbd0 raw: ffff8880216e7fc1 ffff8880216e7000 000000010000003f 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 0x2420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE), pid 41, tgid 41 (kworker/u4:3), ts 9001001122, free_ts 9000108049 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1570 prep_new_page mm/page_alloc.c:1577 [inline] get_page_from_freelist+0xfed/0x2d30 mm/page_alloc.c:3221 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4477 __alloc_pages_node include/linux/gfp.h:237 [inline] kmem_getpages mm/slab.c:1356 [inline] cache_grow_begin+0x9b/0x3b0 mm/slab.c:2550 cache_alloc_refill+0x289/0x3a0 mm/slab.c:2923 ____cache_alloc mm/slab.c:2999 [inline] ____cache_alloc mm/slab.c:2982 [inline] __do_cache_alloc mm/slab.c:3182 [inline] slab_alloc_node mm/slab.c:3230 [inline] __kmem_cache_alloc_node+0x392/0x410 mm/slab.c:3521 __do_kmalloc_node mm/slab_common.c:984 [inline] __kmalloc_node_track_caller+0x4f/0x1a0 mm/slab_common.c:1005 kvasprintf+0xbe/0x160 lib/kasprintf.c:25 kvasprintf_const+0x64/0x190 lib/kasprintf.c:49 kobject_set_name_vargs+0x5a/0x140 lib/kobject.c:267 dev_set_name+0xbf/0xf0 drivers/base/core.c:3429 scsi_sysfs_device_initialize+0x39c/0xa20 drivers/scsi/scsi_sysfs.c:1653 scsi_alloc_sdev+0xa20/0xd60 drivers/scsi/scsi_scan.c:364 scsi_probe_and_add_lun+0x1506/0x2680 drivers/scsi/scsi_scan.c:1189 __scsi_scan_target+0x249/0xe50 drivers/scsi/scsi_scan.c:1676 scsi_scan_channel drivers/scsi/scsi_scan.c:1764 [inline] scsi_scan_channel+0x148/0x1e0 drivers/scsi/scsi_scan.c:1740 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1161 [inline] free_unref_page_prepare+0x62e/0xcb0 mm/page_alloc.c:2348 free_unref_page_list+0xe3/0xa70 mm/page_alloc.c:2489 release_pages+0xcd8/0x1380 mm/swap.c:1042 tlb_batch_pages_flush+0xa8/0x1a0 mm/mmu_gather.c:97 tlb_flush_mmu_free mm/mmu_gather.c:292 [inline] tlb_flush_mmu mm/mmu_gather.c:299 [inline] tlb_finish_mmu+0x14b/0x7e0 mm/mmu_gather.c:391 exit_mmap+0x2cd/0x960 mm/mmap.c:3214 __mmput+0x128/0x4c0 kernel/fork.c:1348 mmput+0x60/0x70 kernel/fork.c:1370 free_bprm+0x144/0x3f0 fs/exec.c:1491 kernel_execve+0x3fe/0x500 fs/exec.c:2025 call_usermodehelper_exec_async+0x260/0x4e0 kernel/umh.c:110 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Memory state around the buggy address: ffff8880216e7c80: 00 00 00 00 fc fc fc fc 00 03 fc fc fc fc fc fc ffff8880216e7d00: 00 00 01 fc fc fc fc fc 05 fc fc fc fc fc fc fc >ffff8880216e7d80: fa fb fb fb fc fc fc fc 00 07 fc fc fc fc fc fc ^ ffff8880216e7e00: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc ffff8880216e7e80: 00 00 01 fc fc fc fc fc 00 00 00 00 fc fc fc fc ==================================================================