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Message-ID: <6840265f.a00a0220.d4325.0009.GAE@google.com> Date: Wed, 04 Jun 2025 03:56:31 -0700 From: syzbot <syzbot+9fc858ba0312b42b577e@...kaller.appspotmail.com> To: davem@...emloft.net, 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?] general protection fault in dev_set_group Hello, syzbot found the following issue on: HEAD commit: b56bbaf8c9ff Merge branch 'net-airoha-fix-ipv6-hw-accelera.. git tree: net console+strace: https://syzkaller.appspot.com/x/log.txt?x=11947c82580000 kernel config: https://syzkaller.appspot.com/x/.config?x=262b2977ef00756b dashboard link: https://syzkaller.appspot.com/bug?extid=9fc858ba0312b42b577e compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1122780c580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15947c82580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/dfc603506ef3/disk-b56bbaf8.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/531e9b9a7cff/vmlinux-b56bbaf8.xz kernel image: https://storage.googleapis.com/syzbot-assets/001a9016bbc6/bzImage-b56bbaf8.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9fc858ba0312b42b577e@...kaller.appspotmail.com netlink: 'syz-executor579': attribute type 1 has an invalid length. Oops: general protection fault, probably for non-canonical address 0xdffffc0000000055: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000002a8-0x00000000000002af] CPU: 1 UID: 0 PID: 5834 Comm: syz-executor579 Not tainted 6.15.0-syzkaller-07817-gb56bbaf8c9ff #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:netdev_need_ops_lock include/net/netdev_lock.h:33 [inline] RIP: 0010:netdev_lock_ops include/net/netdev_lock.h:41 [inline] RIP: 0010:dev_set_group+0xc0/0x230 net/core/dev_api.c:82 Code: 03 43 80 3c 2f 00 74 08 48 89 df e8 4a 40 d4 f8 41 bd a8 02 00 00 4c 03 2b 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ef e8 22 40 d4 f8 31 c0 49 83 7d 00 00 0f RSP: 0018:ffffc9000417ee60 EFLAGS: 00010206 RAX: 0000000000000055 RBX: ffff8880227e4008 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000055690764 RDI: ffff8880227e4000 RBP: ffff8880227e4000 R08: 0000000000400dc0 R09: 00000000ffffffff R10: dffffc0000000000 R11: fffffbfff1f41637 R12: 0000000000000000 R13: 00000000000002a8 R14: 1ffff110044fc998 R15: 1ffff110044fc801 FS: 000055556089f380(0000) GS:ffff888125d66000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000563942114448 CR3: 000000007d85a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> rtnl_create_link+0x748/0xd10 net/core/rtnetlink.c:3674 rtnl_newlink_create+0x25c/0xb00 net/core/rtnetlink.c:3813 __rtnl_newlink net/core/rtnetlink.c:3940 [inline] rtnl_newlink+0x16d6/0x1c70 net/core/rtnetlink.c:4055 rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6944 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x75b/0x8d0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x219/0x270 net/socket.c:727 ____sys_sendmsg+0x505/0x830 net/socket.c:2566 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620 __sys_sendmsg net/socket.c:2652 [inline] __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2655 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa5080a6369 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:00007ffd3dfbc8b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ffd3dfbca88 RCX: 00007fa5080a6369 RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000000000000003 RBP: 00007fa508119610 R08: 0000000000000000 R09: 00007ffd3dfbca88 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffd3dfbca78 R14: 0000000000000001 R15: 0000000000000001 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:netdev_need_ops_lock include/net/netdev_lock.h:33 [inline] RIP: 0010:netdev_lock_ops include/net/netdev_lock.h:41 [inline] RIP: 0010:dev_set_group+0xc0/0x230 net/core/dev_api.c:82 Code: 03 43 80 3c 2f 00 74 08 48 89 df e8 4a 40 d4 f8 41 bd a8 02 00 00 4c 03 2b 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ef e8 22 40 d4 f8 31 c0 49 83 7d 00 00 0f RSP: 0018:ffffc9000417ee60 EFLAGS: 00010206 RAX: 0000000000000055 RBX: ffff8880227e4008 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000055690764 RDI: ffff8880227e4000 RBP: ffff8880227e4000 R08: 0000000000400dc0 R09: 00000000ffffffff R10: dffffc0000000000 R11: fffffbfff1f41637 R12: 0000000000000000 R13: 00000000000002a8 R14: 1ffff110044fc998 R15: 1ffff110044fc801 FS: 000055556089f380(0000) GS:ffff888125c66000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000045ad50 CR3: 000000007d85a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 03 43 80 add -0x80(%rbx),%eax 3: 3c 2f cmp $0x2f,%al 5: 00 74 08 48 add %dh,0x48(%rax,%rcx,1) 9: 89 df mov %ebx,%edi b: e8 4a 40 d4 f8 call 0xf8d4405a 10: 41 bd a8 02 00 00 mov $0x2a8,%r13d 16: 4c 03 2b add (%rbx),%r13 19: 4c 89 e8 mov %r13,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 ef mov %r13,%rdi 33: e8 22 40 d4 f8 call 0xf8d4405a 38: 31 c0 xor %eax,%eax 3a: 49 83 7d 00 00 cmpq $0x0,0x0(%r13) 3f: 0f .byte 0xf --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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