=====================================================
BUG: KMSAN: uninit-value in ax25cmp+0x4a2/0x5f0 net/ax25/ax25_addr.c:119
 ax25cmp+0x4a2/0x5f0 net/ax25/ax25_addr.c:119
 nr_dev_get+0x1c1/0x420 net/netrom/nr_route.c:601
 nr_route_frame+0x233/0x1470 net/netrom/nr_route.c:774
 nr_xmit+0x9c/0x280 net/netrom/nr_dev.c:144
 __netdev_start_xmit include/linux/netdevice.h:4994 [inline]
 netdev_start_xmit include/linux/netdevice.h:5008 [inline]
 xmit_one+0x2f4/0x840 net/core/dev.c:3590
 dev_hard_start_xmit+0x186/0x440 net/core/dev.c:3606
 __dev_queue_xmit+0x2104/0x3290 net/core/dev.c:4229
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4262
 raw_sendmsg+0x819/0xcd0 net/ieee802154/socket.c:294
 ieee802154_sock_sendmsg+0xec/0x130 net/ieee802154/socket.c:96
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg net/socket.c:724 [inline]
 sock_write_iter+0x594/0x690 net/socket.c:1057
 call_write_iter include/linux/fs.h:2162 [inline]
 new_sync_write fs/read_write.c:503 [inline]
 vfs_write+0x1318/0x2030 fs/read_write.c:590
 ksys_write+0x28b/0x510 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __ia32_sys_write+0xdb/0x120 fs/read_write.c:652
 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

Uninit was created at:
 slab_post_alloc_hook mm/slab.h:524 [inline]
 slab_alloc_node mm/slub.c:3251 [inline]
 __kmalloc_node_track_caller+0xe0c/0x1510 mm/slub.c:4974
 kmalloc_reserve net/core/skbuff.c:354 [inline]
 __alloc_skb+0x545/0xf90 net/core/skbuff.c:426
 alloc_skb include/linux/skbuff.h:1126 [inline]
 alloc_skb_with_frags+0x1db/0xbc0 net/core/skbuff.c:6078
 sock_alloc_send_pskb+0xdf4/0xfc0 net/core/sock.c:2575
 sock_alloc_send_skb+0xca/0xe0 net/core/sock.c:2592
 raw_sendmsg+0x4cf/0xcd0 net/ieee802154/socket.c:277
 ieee802154_sock_sendmsg+0xec/0x130 net/ieee802154/socket.c:96
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg net/socket.c:724 [inline]
 sock_write_iter+0x594/0x690 net/socket.c:1057
 call_write_iter include/linux/fs.h:2162 [inline]
 new_sync_write fs/read_write.c:503 [inline]
 vfs_write+0x1318/0x2030 fs/read_write.c:590
 ksys_write+0x28b/0x510 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __ia32_sys_write+0xdb/0x120 fs/read_write.c:652
 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

CPU: 0 PID: 22991 Comm: syz-executor.4 Not tainted 5.16.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================