=====================================================
BUG: KMSAN: uninit-value in ax25cmp+0x38c/0x450 net/ax25/ax25_addr.c:119
 ax25cmp+0x38c/0x450 net/ax25/ax25_addr.c:119
 nr_dev_get+0x20a/0x440 net/netrom/nr_route.c:601
 nr_route_frame+0x19e/0xfc0 net/netrom/nr_route.c:774
 nr_xmit+0x56/0x1c0 net/netrom/nr_dev.c:144
 __netdev_start_xmit include/linux/netdevice.h:4819 [inline]
 netdev_start_xmit include/linux/netdevice.h:4833 [inline]
 xmit_one+0x14e/0x5f0 net/core/dev.c:3590
 dev_hard_start_xmit+0xe5/0x370 net/core/dev.c:3606
 __dev_queue_xmit+0x1dec/0x31f0 net/core/dev.c:4256
 dev_queue_xmit include/linux/netdevice.h:3008 [inline]
 raw_sendmsg+0x644/0xc00 net/ieee802154/socket.c:294
 ieee802154_sock_sendmsg+0x8d/0xc0 net/ieee802154/socket.c:96
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 ____sys_sendmsg+0xabc/0xe90 net/socket.c:2482
 ___sys_sendmsg+0x2a1/0x3f0 net/socket.c:2536
 __sys_sendmmsg+0x544/0xa40 net/socket.c:2615
 __compat_sys_sendmmsg net/compat.c:357 [inline]
 __do_compat_sys_sendmmsg net/compat.c:364 [inline]
 __se_compat_sys_sendmmsg net/compat.c:361 [inline]
 __ia32_compat_sys_sendmmsg+0xc4/0x130 net/compat.c:361
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

Uninit was created at:
 slab_post_alloc_hook mm/slab.h:732 [inline]
 slab_alloc_node mm/slub.c:3258 [inline]
 __kmalloc_node_track_caller+0x814/0x1250 mm/slub.c:4970
 kmalloc_reserve net/core/skbuff.c:362 [inline]
 __alloc_skb+0x346/0xcf0 net/core/skbuff.c:434
 alloc_skb include/linux/skbuff.h:1257 [inline]
 alloc_skb_with_frags+0xb9/0xba0 net/core/skbuff.c:6021
 sock_alloc_send_pskb+0xaa8/0xc30 net/core/sock.c:2665
 sock_alloc_send_skb include/net/sock.h:1866 [inline]
 raw_sendmsg+0x343/0xc00 net/ieee802154/socket.c:277
 ieee802154_sock_sendmsg+0x8d/0xc0 net/ieee802154/socket.c:96
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 ____sys_sendmsg+0xabc/0xe90 net/socket.c:2482
 ___sys_sendmsg+0x2a1/0x3f0 net/socket.c:2536
 __sys_sendmmsg+0x544/0xa40 net/socket.c:2615
 __compat_sys_sendmmsg net/compat.c:357 [inline]
 __do_compat_sys_sendmmsg net/compat.c:364 [inline]
 __se_compat_sys_sendmmsg net/compat.c:361 [inline]
 __ia32_compat_sys_sendmmsg+0xc4/0x130 net/compat.c:361
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

CPU: 0 PID: 5103 Comm: syz-executor.1 Not tainted 6.0.0-rc5-syzkaller-48538-g8f4ae27df775 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
=====================================================