syzbot ci has tested the following series [v1] netfilter: ipvs: fix ct refcount leak when template is invalid https://lore.kernel.org/all/[email protected] * [PATCH] netfilter: ipvs: fix ct refcount leak when template is invalid
and found the following issue: general protection fault in ip_vs_conn_put Full report is available here: https://ci.syzbot.org/series/fb773743-f223-4965-9f38-e5ea600ee724 *** general protection fault in ip_vs_conn_put tree: nf-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netfilter/nf-next.git base: aa064a614efcfa4c300609d1f01134e99a12ad10 arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/3e6a154f-d578-4d43-94af-86e851702925/config syz repro: https://ci.syzbot.org/findings/518450a1-bd56-47bd-b214-be945f6ba221/syz_repro IPVS: sed: FWM 3 0x00000003 - no destination available Oops: general protection fault, probably for non-canonical address 0xdffffc0000000007: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f] CPU: 1 UID: 0 PID: 5812 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:ip_vs_conn_put+0x2b/0x240 net/netfilter/ipvs/ip_vs_conn.c:608 Code: 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 89 fb 49 bc 00 00 00 00 00 fc ff df e8 40 cb c1 f7 4c 8d 73 3c 4d 89 f5 49 c1 ed 03 <43> 0f b6 44 25 00 84 c0 0f 85 9f 01 00 00 41 8b 2e 89 ee 81 e6 00 RSP: 0018:ffffc90003d4eba8 EFLAGS: 00010203 RAX: ffffffff8a03f980 RBX: 0000000000000000 RCX: ffff888169370000 RDX: 0000000000000000 RSI: ffffffff8c28b740 RDI: 0000000000000000 RBP: ffffc90003d4ee30 R08: ffff88823c6247d3 R09: 1ffff110478c48fa R10: dffffc0000000000 R11: ffffed10478c48fb R12: dffffc0000000000 R13: 0000000000000007 R14: 000000000000003c R15: 0000000000000000 FS: 00007faa344d36c0(0000) GS:ffff8882a9276000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007faa33472780 CR3: 0000000169de6000 CR4: 00000000000006f0 Call Trace: <TASK> ip_vs_sched_persist net/netfilter/ipvs/ip_vs_core.c:-1 [inline] ip_vs_schedule+0x100f/0x1d90 net/netfilter/ipvs/ip_vs_core.c:688 udp_conn_schedule+0x391/0x7a0 net/netfilter/ipvs/ip_vs_proto_udp.c:78 ip_vs_try_to_schedule net/netfilter/ipvs/ip_vs_core.c:1659 [inline] ip_vs_in_hook+0xc50/0x1bf0 net/netfilter/ipvs/ip_vs_core.c:2231 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline] nf_hook_slow+0xc5/0x220 net/netfilter/core.c:619 nf_hook+0x22a/0x3a0 include/linux/netfilter.h:273 __ip_local_out+0x558/0x6a0 net/ipv4/ip_output.c:120 ip_local_out+0x2a/0x190 net/ipv4/ip_output.c:129 ip_send_skb+0x45/0xc0 net/ipv4/ip_output.c:1510 udp_send_skb+0x7e4/0xf70 net/ipv4/udp.c:1161 udp_sendmsg+0x1937/0x21a0 net/ipv4/udp.c:1443 udpv6_sendmsg+0x996/0x25c0 net/ipv6/udp.c:1523 sock_sendmsg_nosec net/socket.c:787 [inline] __sock_sendmsg net/socket.c:802 [inline] ____sys_sendmsg+0x5c7/0x9f0 net/socket.c:2698 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2752 __sys_sendmsg net/socket.c:2784 [inline] __do_sys_sendmsg net/socket.c:2789 [inline] __se_sys_sendmsg net/socket.c:2787 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2787 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7faa3359ce59 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:00007faa344d3028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007faa33815fa0 RCX: 00007faa3359ce59 RDX: 0000000000000000 RSI: 0000200000000400 RDI: 0000000000000004 RBP: 00007faa33632d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007faa33816038 R14: 00007faa33815fa0 R15: 00007ffe8bd2ebb8 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ip_vs_conn_put+0x2b/0x240 net/netfilter/ipvs/ip_vs_conn.c:608 Code: 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 89 fb 49 bc 00 00 00 00 00 fc ff df e8 40 cb c1 f7 4c 8d 73 3c 4d 89 f5 49 c1 ed 03 <43> 0f b6 44 25 00 84 c0 0f 85 9f 01 00 00 41 8b 2e 89 ee 81 e6 00 RSP: 0018:ffffc90003d4eba8 EFLAGS: 00010203 RAX: ffffffff8a03f980 RBX: 0000000000000000 RCX: ffff888169370000 RDX: 0000000000000000 RSI: ffffffff8c28b740 RDI: 0000000000000000 RBP: ffffc90003d4ee30 R08: ffff88823c6247d3 R09: 1ffff110478c48fa R10: dffffc0000000000 R11: ffffed10478c48fb R12: dffffc0000000000 R13: 0000000000000007 R14: 000000000000003c R15: 0000000000000000 FS: 00007faa344d36c0(0000) GS:ffff8882a9276000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007faa335ea540 CR3: 0000000169de6000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: 0f 1e fa nop %edx 3: 55 push %rbp 4: 41 57 push %r15 6: 41 56 push %r14 8: 41 55 push %r13 a: 41 54 push %r12 c: 53 push %rbx d: 48 89 fb mov %rdi,%rbx 10: 49 bc 00 00 00 00 00 movabs $0xdffffc0000000000,%r12 17: fc ff df 1a: e8 40 cb c1 f7 call 0xf7c1cb5f 1f: 4c 8d 73 3c lea 0x3c(%rbx),%r14 23: 4d 89 f5 mov %r14,%r13 26: 49 c1 ed 03 shr $0x3,%r13 * 2a: 43 0f b6 44 25 00 movzbl 0x0(%r13,%r12,1),%eax <-- trapping instruction 30: 84 c0 test %al,%al 32: 0f 85 9f 01 00 00 jne 0x1d7 38: 41 8b 2e mov (%r14),%ebp 3b: 89 ee mov %ebp,%esi 3d: 81 .byte 0x81 3e: e6 00 out %al,$0x0 *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: [email protected] --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at [email protected]. To test a patch for this bug, please reply with `#syz test` (should be on a separate line). The patch should be attached to the email. Note: arguments like custom git repos and branches are not supported.
