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Message-ID: <69719dd2.a00a0220.3ad28e.9c55.GAE@google.com> Date: Wed, 21 Jan 2026 19:47:30 -0800 From: syzbot <syzbot+5cf914f193dffde3bd3c@...kaller.appspotmail.com> To: davem@...emloft.net, edumazet@...gle.com, eric.dumazet@...il.com, horms@...nel.org, jhs@...atatu.com, jiri@...nulli.us, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com, xiyou.wangcong@...il.com, yotam.gi@...il.com Subject: Re: [syzbot] [net?] general protection fault in ife_tlv_meta_encode syzbot has found a reproducer for the following issue on: HEAD commit: d8f87aa5fa0a net: remove HIPPI support and RoadRunner HIPP.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=11fbf852580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c06d757173270a35 dashboard link: https://syzkaller.appspot.com/bug?extid=5cf914f193dffde3bd3c compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10d4a7fc580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1691f3fa580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/502d97c34968/disk-d8f87aa5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/71a9c26032b6/vmlinux-d8f87aa5.xz kernel image: https://storage.googleapis.com/syzbot-assets/78eeec8d5dbf/bzImage-d8f87aa5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5cf914f193dffde3bd3c@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 5987 Comm: syz.0.18 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 RIP: 0010:ife_tlv_meta_encode+0x46/0xb0 net/ife/ife.c:166 Code: 50 83 73 f6 45 8d 77 07 4d 8d 65 04 c1 e5 10 44 89 fb 83 c3 04 09 eb 0f cb 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 75 43 41 89 5d 00 41 81 e6 fc ff 00 00 41 8d 46 RSP: 0018:ffffc90003426f60 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000008000300 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000000 RBP: 0000000000030000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: ffffffff8979aa80 R12: 0000000000000004 R13: 0000000000000000 R14: 000000000000000b R15: 0000000000000004 FS: 000055557c2de500(0000) GS:ffff888125a29000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c0083cc000 CR3: 00000000763c8000 CR4: 00000000003526f0 Call Trace: <TASK> ife_encode_meta_u32+0x126/0x1c0 net/sched/act_ife.c:101 tcf_ife_encode net/sched/act_ife.c:841 [inline] tcf_ife_act+0x10fd/0x1d80 net/sched/act_ife.c:877 tc_act include/net/tc_wrapper.h:130 [inline] tcf_action_exec+0x185/0x8e0 net/sched/act_api.c:1152 tc_classify include/net/tc_wrapper.h:197 [inline] __tcf_classify net/sched/cls_api.c:1764 [inline] tcf_classify+0x4cf/0x1130 net/sched/cls_api.c:1860 multiq_classify net/sched/sch_multiq.c:39 [inline] multiq_enqueue+0x102/0x4d0 net/sched/sch_multiq.c:66 dev_qdisc_enqueue+0x4e/0x240 net/core/dev.c:4146 __dev_xmit_skb net/core/dev.c:4261 [inline] __dev_queue_xmit+0x1933/0x32b0 net/core/dev.c:4797 packet_snd net/packet/af_packet.c:3076 [inline] packet_sendmsg+0x3eb6/0x50f0 net/packet/af_packet.c:3108 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:742 ____sys_sendmsg+0x4d7/0x810 net/socket.c:2592 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2a0039acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff41bd8b88 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f2a00615fa0 RCX: 00007f2a0039acb9 RDX: 0000000000000004 RSI: 00002000000000c0 RDI: 0000000000000008 RBP: 00007fff41bd8bf0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007f2a00615fac R14: 00007f2a00615fa0 R15: 00007f2a00615fa0 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ife_tlv_meta_encode+0x46/0xb0 net/ife/ife.c:166 Code: 50 83 73 f6 45 8d 77 07 4d 8d 65 04 c1 e5 10 44 89 fb 83 c3 04 09 eb 0f cb 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 75 43 41 89 5d 00 41 81 e6 fc ff 00 00 41 8d 46 RSP: 0018:ffffc90003426f60 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000008000300 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000000 RBP: 0000000000030000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: ffffffff8979aa80 R12: 0000000000000004 R13: 0000000000000000 R14: 000000000000000b R15: 0000000000000004 FS: 000055557c2de500(0000) GS:ffff888125a29000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c0083cc000 CR3: 00000000763c8000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 50 push %rax 1: 83 73 f6 45 xorl $0x45,-0xa(%rbx) 5: 8d 77 07 lea 0x7(%rdi),%esi 8: 4d 8d 65 04 lea 0x4(%r13),%r12 c: c1 e5 10 shl $0x10,%ebp f: 44 89 fb mov %r15d,%ebx 12: 83 c3 04 add $0x4,%ebx 15: 09 eb or %ebp,%ebx 17: 0f cb bswap %ebx 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: 0f b6 04 08 movzbl (%rax,%rcx,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 75 43 jne 0x75 32: 41 89 5d 00 mov %ebx,0x0(%r13) 36: 41 81 e6 fc ff 00 00 and $0xfffc,%r14d 3d: 41 rex.B 3e: 8d .byte 0x8d 3f: 46 rex.RX --- 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.
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