================================================================== BUG: KASAN: slab-out-of-bounds in string_nocheck lib/vsprintf.c:642 [inline] BUG: KASAN: slab-out-of-bounds in string+0x204/0x290 lib/vsprintf.c:724 Read of size 1 at addr ffff88814a744ca1 by task syz.0.17/4316 CPU: 1 PID: 4316 Comm: syz.0.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 string_nocheck lib/vsprintf.c:642 [inline] string+0x204/0x290 lib/vsprintf.c:724 vsnprintf+0x10db/0x1c20 lib/vsprintf.c:2811 va_format lib/vsprintf.c:1713 [inline] pointer+0x7b2/0xc60 lib/vsprintf.c:2448 vsnprintf+0xd7c/0x1c20 lib/vsprintf.c:2815 vprintk_store+0x378/0x11b0 kernel/printk/printk.c:2164 vprintk_emit+0x85/0x150 kernel/printk/printk.c:2258 _printk+0xda/0x130 kernel/printk/printk.c:2299 __dynamic_pr_debug+0x196/0x240 lib/dynamic_debug.c:619 nfc_llcp_wks_sap net/nfc/llcp_core.c:344 [inline] nfc_llcp_get_sdp_ssap+0x3c1/0x3f0 net/nfc/llcp_core.c:420 llcp_sock_bind+0x3a2/0x770 net/nfc/llcp_sock.c:117 __sys_bind+0x2e9/0x3e0 net/socket.c:1730 __do_sys_bind net/socket.c:1741 [inline] __se_sys_bind net/socket.c:1739 [inline] __x64_sys_bind+0x76/0x80 net/socket.c:1739 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7efec8138159 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:00007fff34d35a68 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 00007efec83bffa0 RCX: 00007efec8138159 RDX: 0000000000000060 RSI: 0000200000000280 RDI: 0000000000000005 RBP: 00007efec81cf06b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007efec83bffac R14: 00007efec83bffa0 R15: 00007efec83bffa0 Allocated by task 4316: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc+0xaf/0xe0 mm/kasan/common.c:522 kmemdup+0x22/0x50 mm/util.c:128 llcp_sock_bind+0x360/0x770 net/nfc/llcp_sock.c:107 __sys_bind+0x2e9/0x3e0 net/socket.c:1730 __do_sys_bind net/socket.c:1741 [inline] __se_sys_bind net/socket.c:1739 [inline] __x64_sys_bind+0x76/0x80 net/socket.c:1739 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff88814a744c80 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 33 bytes inside of 64-byte region [ffff88814a744c80, ffff88814a744cc0) The buggy address belongs to the page: page:ffffea000529d100 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x14a744 flags: 0x57ff00000000200(slab|node=1|zone=2|lastcpupid=0x7ff) raw: 057ff00000000200 ffffea00052ba740 0000001700000017 ffff888016c41640 raw: 0000000000000000 0000000080200020 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, ts 19270739362, free_ts 0 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x24f6/0x2670 mm/page_alloc.c:4192 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501 alloc_page_interleave+0x24/0x1e0 mm/mempolicy.c:2031 alloc_slab_page mm/slub.c:1780 [inline] allocate_slab mm/slub.c:1917 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1980 ___slab_alloc+0x807/0xdd0 mm/slub.c:3013 __slab_alloc mm/slub.c:3100 [inline] slab_alloc_node mm/slub.c:3191 [inline] slab_alloc mm/slub.c:3233 [inline] __kmalloc+0x11d/0x340 mm/slub.c:4408 kmalloc include/linux/slab.h:612 [inline] kzalloc include/linux/slab.h:738 [inline] handler_new_ref+0x1fb/0x8d0 drivers/media/v4l2-core/v4l2-ctrls-core.c:1123 v4l2_ctrl_add_handler+0x197/0x280 drivers/media/v4l2-core/v4l2-ctrls-core.c:1590 vivid_create_controls+0x2ad8/0x3380 drivers/media/test-drivers/vivid/vivid-ctrls.c:1947 vivid_create_instance drivers/media/test-drivers/vivid/vivid-core.c:1860 [inline] vivid_probe+0x39ff/0x6240 drivers/media/test-drivers/vivid/vivid-core.c:2031 platform_probe+0x137/0x1c0 drivers/base/platform.c:1391 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x276/0xc70 drivers/base/dd.c:595 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:775 driver_probe_device+0x4f/0x420 drivers/base/dd.c:805 __driver_attach+0x45d/0x660 drivers/base/dd.c:1184 bus_for_each_dev+0x182/0x1f0 drivers/base/bus.c:303 page_owner free stack trace missing Memory state around the buggy address: ffff88814a744b80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff88814a744c00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88814a744c80: 00 00 00 00 01 fc fc fc fc fc fc fc fc fc fc fc ^ ffff88814a744d00: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff88814a744d80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================