syzbot

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BUG: KMSAN: uninit-value in ipv6_find_tlv+0x460/0x510 net/ipv6/exthdrs_core.c:147
 ipv6_find_tlv+0x460/0x510 net/ipv6/exthdrs_core.c:147
 ip6_find_1stfragopt+0x2af/0x610 net/ipv6/output_core.c:84
 ip6_fragment+0x26b/0x4550 net/ipv6/ip6_output.c:824
 __ip6_finish_output+0xcc6/0x10b0 net/ipv6/ip6_output.c:189
 ip6_finish_output+0x15c/0x590 net/ipv6/ip6_output.c:201
 NF_HOOK_COND include/linux/netfilter.h:296 [inline]
 ip6_output+0x4b9/0x800 net/ipv6/ip6_output.c:224
 dst_output include/net/dst.h:451 [inline]
 ip6_local_out+0x180/0x1f0 net/ipv6/output_core.c:161
 ip6_send_skb net/ipv6/ip6_output.c:1925 [inline]
 ip6_push_pending_frames+0x252/0x570 net/ipv6/ip6_output.c:1945
 rawv6_push_pending_frames+0xcc1/0xd30 net/ipv6/raw.c:613
 rawv6_sendmsg+0x3079/0x33b0 net/ipv6/raw.c:956
 inet_sendmsg+0x15b/0x1d0 net/ipv4/af_inet.c:819
 sock_sendmsg_nosec net/socket.c:705 [inline]
 sock_sendmsg net/socket.c:725 [inline]
 ____sys_sendmsg+0xe11/0x12c0 net/socket.c:2413
 ___sys_sendmsg net/socket.c:2467 [inline]
 __sys_sendmsg+0x704/0x840 net/socket.c:2496
 __do_sys_sendmsg net/socket.c:2505 [inline]
 __se_sys_sendmsg net/socket.c:2503 [inline]
 __x64_sys_sendmsg+0xe2/0x120 net/socket.c:2503
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x51/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Uninit was created at:
 slab_post_alloc_hook mm/slab.h:754 [inline]
 slab_alloc_node mm/slub.c:3231 [inline]
 __kmalloc_node_track_caller+0xde3/0x14f0 mm/slub.c:4962
 kmalloc_reserve net/core/skbuff.c:354 [inline]
 __alloc_skb+0x545/0xf90 net/core/skbuff.c:426
 alloc_skb include/linux/skbuff.h:1300 [inline]
 alloc_skb_with_frags+0x1df/0xd60 net/core/skbuff.c:5995
 sock_alloc_send_pskb+0xdf4/0xfc0 net/core/sock.c:2600
 sock_alloc_send_skb+0xca/0xe0 net/core/sock.c:2617
 __ip6_append_data+0x4f13/0x72a0 net/ipv6/ip6_output.c:1633
 ip6_append_data+0x453/0x830 net/ipv6/ip6_output.c:1808
 rawv6_sendmsg+0x2e18/0x33b0 net/ipv6/raw.c:949
 inet_sendmsg+0x15b/0x1d0 net/ipv4/af_inet.c:819
 sock_sendmsg_nosec net/socket.c:705 [inline]
 sock_sendmsg net/socket.c:725 [inline]
 ____sys_sendmsg+0xe11/0x12c0 net/socket.c:2413
 ___sys_sendmsg net/socket.c:2467 [inline]
 __sys_sendmsg+0x704/0x840 net/socket.c:2496
 __do_sys_sendmsg net/socket.c:2505 [inline]
 __se_sys_sendmsg net/socket.c:2503 [inline]
 __x64_sys_sendmsg+0xe2/0x120 net/socket.c:2503
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x51/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x44/0xae

CPU: 0 PID: 3507 Comm: syz-executor227 Not tainted 5.18.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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