syzbot

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BUG: KMSAN: uninit-value in ax25cmp+0x3a5/0x470 net/ax25/ax25_addr.c:119
 ax25cmp+0x3a5/0x470 net/ax25/ax25_addr.c:119
 nr_dev_get+0x20e/0x450 net/netrom/nr_route.c:596
 nr_route_frame+0x1a2/0xfe0 net/netrom/nr_route.c:769
 nr_xmit+0x5a/0x1c0 net/netrom/nr_dev.c:144
 __netdev_start_xmit include/linux/netdevice.h:4928 [inline]
 netdev_start_xmit include/linux/netdevice.h:4937 [inline]
 xmit_one net/core/dev.c:3588 [inline]
 dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3604
 __dev_queue_xmit+0x3562/0x56d0 net/core/dev.c:4432
 dev_queue_xmit include/linux/netdevice.h:3094 [inline]
 raw_sendmsg+0x64e/0xc10 net/ieee802154/socket.c:299
 ieee802154_sock_sendmsg+0x96/0xd0 net/ieee802154/socket.c:96
 sock_sendmsg_nosec net/socket.c:729 [inline]
 __sock_sendmsg+0x30f/0x380 net/socket.c:744
 ____sys_sendmsg+0x903/0xb60 net/socket.c:2607
 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2661
 __sys_sendmmsg+0x3c1/0x960 net/socket.c:2747
 __do_sys_sendmmsg net/socket.c:2776 [inline]
 __se_sys_sendmmsg net/socket.c:2773 [inline]
 __x64_sys_sendmmsg+0xbc/0x120 net/socket.c:2773
 x64_sys_call+0xb6e/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:308
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4091 [inline]
 slab_alloc_node mm/slub.c:4134 [inline]
 kmem_cache_alloc_node_noprof+0x6bf/0xb80 mm/slub.c:4186
 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:587
 __alloc_skb+0x363/0x7b0 net/core/skbuff.c:678
 alloc_skb include/linux/skbuff.h:1322 [inline]
 alloc_skb_with_frags+0xc8/0xd00 net/core/skbuff.c:6612
 sock_alloc_send_pskb+0xa81/0xbf0 net/core/sock.c:2883
 sock_alloc_send_skb include/net/sock.h:1782 [inline]
 raw_sendmsg+0x367/0xc10 net/ieee802154/socket.c:282
 ieee802154_sock_sendmsg+0x96/0xd0 net/ieee802154/socket.c:96
 sock_sendmsg_nosec net/socket.c:729 [inline]
 __sock_sendmsg+0x30f/0x380 net/socket.c:744
 ____sys_sendmsg+0x903/0xb60 net/socket.c:2607
 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2661
 __sys_sendmmsg+0x3c1/0x960 net/socket.c:2747
 __do_sys_sendmmsg net/socket.c:2776 [inline]
 __se_sys_sendmmsg net/socket.c:2773 [inline]
 __x64_sys_sendmmsg+0xbc/0x120 net/socket.c:2773
 x64_sys_call+0xb6e/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:308
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 5814 Comm: syz-executor752 Not tainted 6.12.0-rc5-syzkaller-00308-g3e5e6c9900c3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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