netlink: 20 bytes leftover after parsing attributes in process `syz.8.2022'.
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BUG: KASAN: slab-out-of-bounds in hex_string+0x274/0x364 lib/vsprintf.c:1209
Read of size 1 at addr ffff0000cdfc097c by task syz.8.2022/11153

CPU: 0 UID: 0 PID: 11153 Comm: syz.8.2022 Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 print_address_description+0xb0/0x238 mm/kasan/report.c:378
 print_report+0x68/0x84 mm/kasan/report.c:482
 kasan_report+0x8c/0xc4 mm/kasan/report.c:595
 __asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378
 hex_string+0x274/0x364 lib/vsprintf.c:1209
 pointer+0x1a8/0x6b4 lib/vsprintf.c:2548
 vsnprintf+0x618/0xd10 lib/vsprintf.c:2953
 va_format lib/vsprintf.c:1725 [inline]
 pointer+0x5e8/0x6b4 lib/vsprintf.c:2577
 vsnprintf+0x618/0xd10 lib/vsprintf.c:2953
 vscnprintf+0x6c/0xd4 lib/vsprintf.c:3018
 printk_sprint+0xc0/0x65c kernel/printk/printk.c:2222
 vprintk_store+0x714/0xb94 kernel/printk/printk.c:2364
 vprintk_emit+0x1bc/0x514 kernel/printk/printk.c:2455
 dev_vprintk_emit+0x2ec/0x3b4 drivers/base/core.c:5000
 dev_printk_emit+0xe0/0x130 drivers/base/core.c:5011
 __dynamic_dev_dbg+0x1b4/0x254 lib/dynamic_debug.c:904
 dtv_property_process_get+0x26bc/0x2838 drivers/media/dvb-core/dvb_frontend.c:1595
 dvb_get_property drivers/media/dvb-core/dvb_frontend.c:2397 [inline]
 dvb_frontend_handle_ioctl+0x1644/0x2424 drivers/media/dvb-core/dvb_frontend.c:2478
 dvb_frontend_do_ioctl+0x124/0x278 drivers/media/dvb-core/dvb_frontend.c:2101
 dvb_usercopy+0x2a4/0x4d4 drivers/media/dvb-core/dvbdev.c:996
 dvb_frontend_ioctl+0x68/0x8c 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 fs/ioctl.c:583 [inline]
 __arm64_sys_ioctl+0x154/0x1cc fs/ioctl.c:583
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606

Allocated by task 11153:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:78
 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:570
 poison_kmalloc_redzone mm/kasan/common.c:409 [inline]
 __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:426
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5414 [inline]
 __kmalloc_node_track_caller_noprof+0x440/0x6e0 mm/slub.c:5545
 memdup_user+0x44/0xec 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+0xb8c/0x2424 drivers/media/dvb-core/dvb_frontend.c:2478
 dvb_frontend_do_ioctl+0x124/0x278 drivers/media/dvb-core/dvb_frontend.c:2101
 dvb_usercopy+0x2a4/0x4d4 drivers/media/dvb-core/dvbdev.c:996
 dvb_frontend_ioctl+0x68/0x8c 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 fs/ioctl.c:583 [inline]
 __arm64_sys_ioctl+0x154/0x1cc fs/ioctl.c:583
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606

The buggy address belongs to the object at ffff0000cdfc0800
 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 [ffff0000cdfc0800, ffff0000cdfc097c)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff0000cdfc3c00 pfn:0x10dfc0
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x5ffc00000000240(workingset|head|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 05ffc00000000240 ffff0000c0001c80 fffffdffc3cb9410 fffffdffc3649310
raw: ffff0000cdfc3c00 000000000010000f 00000000f5000000 0000000000000000
head: 05ffc00000000240 ffff0000c0001c80 fffffdffc3cb9410 fffffdffc3649310
head: ffff0000cdfc3c00 000000000010000f 00000000f5000000 0000000000000000
head: 05ffc00000000002 fffffdffc337f001 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000cdfc0800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000cdfc0880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000cdfc0900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 04
                                                                ^
 ffff0000cdfc0980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000cdfc0a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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