================================================================== BUG: KASAN: slab-out-of-bounds in string_nocheck lib/vsprintf.c:645 [inline] BUG: KASAN: slab-out-of-bounds in string+0x204/0x290 lib/vsprintf.c:727 Read of size 1 at addr ffff888042d4f1b9 by task syz.5.2253/25966 CPU: 0 PID: 25966 Comm: syz.5.2253 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xa8/0x210 mm/kasan/report.c:468 kasan_report+0x117/0x150 mm/kasan/report.c:581 string_nocheck lib/vsprintf.c:645 [inline] string+0x204/0x290 lib/vsprintf.c:727 vsnprintf+0xf72/0x1ba0 lib/vsprintf.c:2823 va_format lib/vsprintf.c:1682 [inline] pointer+0x9ed/0x1150 lib/vsprintf.c:2454 vsnprintf+0xdaa/0x1ba0 lib/vsprintf.c:2827 vprintk_store+0x3d9/0xd50 kernel/printk/printk.c:2226 vprintk_emit+0x117/0x610 kernel/printk/printk.c:2322 _printk+0xde/0x130 kernel/printk/printk.c:2366 __dynamic_pr_debug+0x1a3/0x260 lib/dynamic_debug.c:879 nfc_llcp_wks_sap net/nfc/llcp_core.c:342 [inline] nfc_llcp_get_sdp_ssap+0x3a4/0x3d0 net/nfc/llcp_core.c:418 llcp_sock_bind+0x3be/0x710 net/nfc/llcp_sock.c:114 __sys_bind+0x2f0/0x3f0 net/socket.c:1856 __do_sys_bind net/socket.c:1867 [inline] __se_sys_bind net/socket.c:1865 [inline] __x64_sys_bind+0x7a/0x90 net/socket.c:1865 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fcc3239e159 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:00007fcc331d5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 00007fcc32625fa0 RCX: 00007fcc3239e159 RDX: 0000000000000060 RSI: 0000200000000080 RDI: 0000000000000005 RBP: 00007fcc3243506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcc32626038 R14: 00007fcc32625fa0 R15: 00007ffdaf98cd88 Allocated by task 25966: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:198 [inline] __do_kmalloc_node mm/slab_common.c:1007 [inline] __kmalloc_node_track_caller+0xb4/0x230 mm/slab_common.c:1027 kmemdup+0x2b/0x70 mm/util.c:131 kmemdup include/linux/fortify-string.h:779 [inline] llcp_sock_bind+0x370/0x710 net/nfc/llcp_sock.c:107 __sys_bind+0x2f0/0x3f0 net/socket.c:1856 __do_sys_bind net/socket.c:1867 [inline] __se_sys_bind net/socket.c:1865 [inline] __x64_sys_bind+0x7a/0x90 net/socket.c:1865 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff888042d4f1b8 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 0 bytes to the right of allocated 1-byte region [ffff888042d4f1b8, ffff888042d4f1b9) The buggy address belongs to the physical page: page:ffffea00010b53c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x42d4f flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888017c41280 ffffea00010f0c80 dead000000000002 raw: 0000000000000000 0000000080660066 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 24933, tgid 24929 (syz.3.2129), ts 1299644496367, free_ts 1249583950836 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1582 prep_new_page mm/page_alloc.c:1589 [inline] get_page_from_freelist+0x2181/0x22a0 mm/page_alloc.c:3221 __alloc_pages+0x1f0/0x460 mm/page_alloc.c:4501 alloc_slab_page+0x5d/0x180 mm/slub.c:1881 allocate_slab mm/slub.c:2028 [inline] new_slab+0x87/0x2d0 mm/slub.c:2081 ___slab_alloc+0xc5c/0x12f0 mm/slub.c:3253 __slab_alloc mm/slub.c:3339 [inline] __slab_alloc_node mm/slub.c:3392 [inline] slab_alloc_node mm/slub.c:3485 [inline] __kmem_cache_alloc_node+0x11f/0x250 mm/slub.c:3534 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc_node_track_caller+0xa4/0x230 mm/slab_common.c:1027 kstrdup+0x3b/0x80 mm/util.c:62 __kernfs_new_node+0xaa/0x7f0 fs/kernfs/dir.c:620 kernfs_new_node+0x14c/0x260 fs/kernfs/dir.c:700 __kernfs_create_file+0x4b/0x2e0 fs/kernfs/file.c:1068 sysfs_add_file_mode_ns+0x237/0x2f0 fs/sysfs/file.c:298 create_files fs/sysfs/group.c:64 [inline] internal_create_group+0x431/0xd10 fs/sysfs/group.c:152 internal_create_groups fs/sysfs/group.c:192 [inline] sysfs_create_groups+0x59/0x120 fs/sysfs/group.c:218 setup_gid_attrs drivers/infiniband/core/sysfs.c:1174 [inline] ib_setup_port_attrs+0x16e1/0x2370 drivers/infiniband/core/sysfs.c:1451 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1182 [inline] free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2459 kasan_depopulate_vmalloc_pte+0x75/0x90 mm/kasan/shadow.c:427 apply_to_pte_range mm/memory.c:2604 [inline] apply_to_pmd_range mm/memory.c:2648 [inline] apply_to_pud_range mm/memory.c:2684 [inline] apply_to_p4d_range mm/memory.c:2720 [inline] __apply_to_page_range+0x860/0xdd0 mm/memory.c:2756 kasan_release_vmalloc+0x97/0xb0 mm/kasan/shadow.c:544 __purge_vmap_area_lazy+0xf7c/0x1ab0 mm/vmalloc.c:1809 drain_vmap_area_work+0x40/0xd0 mm/vmalloc.c:1843 process_one_work kernel/workqueue.c:2657 [inline] process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734 worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 Memory state around the buggy address: ffff888042d4f080: fc fc fc fc 00 fc fc fc fc 05 fc fc fc fc 05 fc ffff888042d4f100: fc fc fc 05 fc fc fc fc 05 fc fc fc fc fa fc fc >ffff888042d4f180: fc fc 00 fc fc fc fc 01 fc fc fc fc 06 fc fc fc ^ ffff888042d4f200: fc 05 fc fc fc fc 05 fc fc fc fc 05 fc fc fc fc ffff888042d4f280: 05 fc fc fc fc 05 fc fc fc fc 05 fc fc fc fc 05 ==================================================================