=====================================================
BUG: KMSAN: uninit-value in va_format lib/vsprintf.c:1683 [inline]
BUG: KMSAN: uninit-value in pointer+0x1b1c/0x2060 lib/vsprintf.c:2425
 va_format lib/vsprintf.c:1683 [inline]
 pointer+0x1b1c/0x2060 lib/vsprintf.c:2425
 vsnprintf+0x1a9b/0x3650 lib/vsprintf.c:2799
 vprintk_store+0x537/0x2150 kernel/printk/printk.c:2135
 vprintk_emit+0x25c/0x950 kernel/printk/printk.c:2229
 dev_vprintk_emit+0x5ef/0x6d0 drivers/base/core.c:4604
 dev_printk_emit+0x1dd/0x21f drivers/base/core.c:4615
 __netdev_printk+0x7e9/0xae0 net/core/dev.c:10782
 netdev_info+0x1ea/0x22f net/core/dev.c:10837
 dev_change_name+0x14a8/0x14c0 net/core/dev.c:1173
 do_setlink+0x12a6/0x74e0 net/core/rtnetlink.c:2709
 __rtnl_newlink net/core/rtnetlink.c:3414 [inline]
 rtnl_newlink+0x327f/0x4220 net/core/rtnetlink.c:3529
 rtnetlink_rcv_msg+0x148d/0x18d0 net/core/rtnetlink.c:5594
 netlink_rcv_skb+0x40c/0x7e0 net/netlink/af_netlink.c:2494
 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:5612
 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
 netlink_unicast+0x1093/0x1360 net/netlink/af_netlink.c:1343
 netlink_sendmsg+0x14d9/0x1720 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec net/socket.c:705 [inline]
 sock_sendmsg net/socket.c:725 [inline]
 __sys_sendto+0x9ef/0xc70 net/socket.c:2040
 __se_compat_sys_socketcall+0x9ff/0x1670 net/compat.c:424
 __ia32_compat_sys_socketcall+0x91/0xc0 net/compat.c:424
 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Local variable tmp created at:
 number+0xad/0x23d0 lib/vsprintf.c:453
 vsnprintf+0x1f0d/0x3650 lib/vsprintf.c:2861

CPU: 1 PID: 3504 Comm: syz-executor.4 Not tainted 5.17.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================