linux-kernel - [syzbot] [net?] WARNING in ipv6_addr

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Message-ID: <681357d6.050a0220.14dd7d.000b.GAE@google.com>
Date: Thu, 01 May 2025 04:15:34 -0700
From: syzbot <syzbot+9596c1b9df18e0ae7261@...kaller.appspotmail.com>
To: davem@...emloft.net, dsahern@...nel.org, edumazet@...gle.com, 
	horms@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org, 
	netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [net?] WARNING in ipv6_addr_prefix

Hello,

syzbot found the following issue on:

HEAD commit:    5565acd1e6c4 Merge git://git.kernel.org/pub/scm/linux/kern..
git tree:       net-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=1178cecc580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2e3745cb659ef5d9
dashboard link: https://syzkaller.appspot.com/bug?extid=9596c1b9df18e0ae7261
compiler:       Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=122efd9b980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15e99574580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/80798769614c/disk-5565acd1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/435ecb0f1371/vmlinux-5565acd1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7790d5f923b6/bzImage-5565acd1.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9596c1b9df18e0ae7261@...kaller.appspotmail.com

UDPLite6: UDP-Lite is deprecated and scheduled to be removed in 2025, please contact the netdev mailing list
------------[ cut here ]------------
memcpy: detected field-spanning write (size 898) of single field "pfx->in6_u.u6_addr8" at ./include/net/ipv6.h:614 (size 16)
WARNING: CPU: 0 PID: 5838 at ./include/net/ipv6.h:614 ipv6_addr_prefix+0x124/0x1d0 include/net/ipv6.h:614
Modules linked in:
CPU: 0 UID: 0 PID: 5838 Comm: syz-executor414 Not tainted 6.15.0-rc3-syzkaller-00557-g5565acd1e6c4 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:ipv6_addr_prefix+0x124/0x1d0 include/net/ipv6.h:614
Code: cc e8 70 eb af f7 c6 05 b8 a8 59 05 01 90 b9 10 00 00 00 48 c7 c7 a0 86 7d 8c 4c 89 fe 48 c7 c2 c0 8d 7d 8c e8 4d 4a 74 f7 90 <0f> 0b 90 90 e9 33 ff ff ff e8 3e eb af f7 44 89 e6 48 c7 c7 c0 53
RSP: 0018:ffffc90003eb7920 EFLAGS: 00010246
RAX: 8f8f704687b6a900 RBX: ffff8880337f5c50 RCX: ffff88803326da00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 0000000000000000 R08: ffffc90003eb7607 R09: 1ffff920007d6ec0
R10: dffffc0000000000 R11: fffff520007d6ec1 R12: 0000000000000382
R13: 1ffff920007d6f4e R14: ffffc90003eb7a84 R15: 0000000000000382
FS:  0000555594768380(0000) GS:ffff8881260b2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d1681c9000 CR3: 0000000078e3e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ip6_route_info_create+0x5cc/0xa70 net/ipv6/route.c:3810
 ip6_route_add+0x29/0x2f0 net/ipv6/route.c:3902
 ipv6_route_ioctl+0x35c/0x480 net/ipv6/route.c:4539
 inet6_ioctl+0x219/0x280 net/ipv6/af_inet6.c:577
 sock_do_ioctl+0xd9/0x300 net/socket.c:1190
 sock_ioctl+0x576/0x790 net/socket.c:1311
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa5ecea7369
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff70ec1b18 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fff70ec1ce8 RCX: 00007fa5ecea7369
RDX: 0000200000000340 RSI: 000000000000890b RDI: 0000000000000003
RBP: 00007fa5ecf1a610 R08: 0000000000000000 R09: 00007fff70ec1ce8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff70ec1cd8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>


---
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