i2c i2c-0: dtv_property_process_get: GET cmd 0x00000023 (DTV_API_VERSION) len 0: ================================================================== BUG: KASAN: slab-out-of-bounds in hex_string+0x419/0x520 lib/vsprintf.c:1208 Read of size 1 at addr ffff88807e56317c by task syz.0.1926/18383 CPU: 0 UID: 0 PID: 18383 Comm: syz.0.1926 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 hex_string+0x419/0x520 lib/vsprintf.c:1208 pointer+0x38a/0x1120 lib/vsprintf.c:2547 vsnprintf+0x626/0xef0 lib/vsprintf.c:2952 va_format lib/vsprintf.c:1724 [inline] pointer+0xa12/0x1120 lib/vsprintf.c:2576 vsnprintf+0x626/0xef0 lib/vsprintf.c:2952 vscnprintf+0x41/0x90 lib/vsprintf.c:3017 printk_sprint+0x31/0x480 kernel/printk/printk.c:2222 vprintk_store+0x74f/0xd90 kernel/printk/printk.c:2364 vprintk_emit+0x192/0x5f0 kernel/printk/printk.c:2455 dev_vprintk_emit+0x338/0x400 drivers/base/core.c:5002 dev_printk_emit+0xee/0x140 drivers/base/core.c:5013 __dynamic_dev_dbg+0x211/0x2e0 lib/dynamic_debug.c:904 dtv_property_process_get+0x4263/0x4480 drivers/media/dvb-core/dvb_frontend.c:1595 dvb_get_property drivers/media/dvb-core/dvb_frontend.c:2397 [inline] dvb_frontend_handle_ioctl drivers/media/dvb-core/dvb_frontend.c:2478 [inline] dvb_frontend_do_ioctl+0x1d27/0x4290 drivers/media/dvb-core/dvb_frontend.c:2101 dvb_usercopy+0x199/0x2e0 drivers/media/dvb-core/dvbdev.c:996 dvb_frontend_ioctl+0x59/0x80 drivers/media/dvb-core/dvb_frontend.c:2115 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f719eb9f559 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:00007f719fa48028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f719ee26090 RCX: 00007f719eb9f559 RDX: 000020000001fc80 RSI: 0000000080106f53 RDI: 0000000000000004 RBP: 00007f719ec36b50 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f719ee26128 R14: 00007f719ee26090 R15: 00007ffd15153748 Allocated by task 18383: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5531 [inline] __kmalloc_node_track_caller_noprof+0x4af/0x720 mm/slub.c:5662 memdup_user+0x2b/0xd0 mm/util.c:221 memdup_array_user include/linux/string.h:39 [inline] dvb_get_property drivers/media/dvb-core/dvb_frontend.c:2380 [inline] dvb_frontend_handle_ioctl drivers/media/dvb-core/dvb_frontend.c:2478 [inline] dvb_frontend_do_ioctl+0x11a6/0x4290 drivers/media/dvb-core/dvb_frontend.c:2101 dvb_usercopy+0x199/0x2e0 drivers/media/dvb-core/dvbdev.c:996 dvb_frontend_ioctl+0x59/0x80 drivers/media/dvb-core/dvb_frontend.c:2115 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88807e563000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes to the right of allocated 380-byte region [ffff88807e563000, ffff88807e56317c) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88807e561000 pfn:0x7e560 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88813ff25c80 ffffea00015f9310 ffffea0000d04c10 raw: ffff88807e561000 000000000010000c 00000000f5000000 0000000000000000 head: 00fff00000000240 ffff88813ff25c80 ffffea00015f9310 ffffea0000d04c10 head: ffff88807e561000 000000000010000c 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5634, tgid 5634 (syz-executor), ts 91840805715 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0x220f/0x2280 mm/page_alloc.c:3938 __alloc_frozen_pages_noprof+0x1fe/0x410 mm/page_alloc.c:5447 alloc_slab_page mm/slub.c:3384 [inline] allocate_slab+0x7d/0x5e0 mm/slub.c:3499 new_slab mm/slub.c:3550 [inline] refill_objects+0x2d5/0x350 mm/slub.c:7539 refill_sheaf mm/slub.c:2917 [inline] __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4811 alloc_from_pcs mm/slub.c:4887 [inline] slab_alloc_node mm/slub.c:5021 [inline] __kmalloc_cache_noprof+0x396/0x600 mm/slub.c:5676 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] inetdev_init+0x96/0x4f0 net/ipv4/devinet.c:275 inetdev_event+0x11c4/0x1610 net/ipv4/devinet.c:1580 notifier_call_chain+0x1a5/0x3d0 kernel/notifier.c:86 call_netdevice_notifiers_extack net/core/dev.c:2351 [inline] call_netdevice_notifiers net/core/dev.c:2365 [inline] register_netdevice+0x1bfe/0x2280 net/core/dev.c:11739 wg_newlink+0x39b/0x670 drivers/net/wireguard/device.c:372 rtnl_newlink_create+0x305/0x7b0 net/core/rtnetlink.c:4006 __rtnl_newlink net/core/rtnetlink.c:4135 [inline] rtnl_newlink+0x167a/0x1c30 net/core/rtnetlink.c:4252 rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7169 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2584 page last free pid 5017 tgid 5017 ts 36839919962 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1403 [inline] __free_frozen_pages+0xc97/0xd90 mm/page_alloc.c:2957 __slab_free+0x269/0x2c0 mm/slub.c:5926 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:361 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4720 [inline] slab_alloc_node mm/slub.c:5033 [inline] kmem_cache_alloc_noprof+0x2b4/0x600 mm/slub.c:5047 alloc_filename fs/namei.c:147 [inline] do_getname+0x2e/0x250 fs/namei.c:187 class_filename_flags_constructor include/linux/fs.h:2595 [inline] do_readlinkat+0xc8/0x510 fs/stat.c:573 __do_sys_readlink fs/stat.c:609 [inline] __se_sys_readlink fs/stat.c:606 [inline] __x64_sys_readlink+0x7f/0x90 fs/stat.c:606 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88807e563000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807e563080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88807e563100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 04 ^ ffff88807e563180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807e563200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc 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