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[204.195.96.226]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4790b0c3a28sm325717315e9.9.2025.12.01.08.32.32 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Dec 2025 08:32:33 -0800 (PST) Date: Mon, 1 Dec 2025 08:32:28 -0800 From: Stephen Hemminger To: netdev@vger.kernel.org Subject: Fw: [Bug 220820] New: net: tcp: avoid division by zero in __tcp_select_window Message-ID: <20251201083228.70b70181@phoenix.local> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Begin forwarded message: Date: Mon, 01 Dec 2025 10:26:14 +0000 From: bugzilla-daemon@kernel.org To: stephen@networkplumber.org Subject: [Bug 220820] New: net: tcp: avoid division by zero in __tcp_select_window https://bugzilla.kernel.org/show_bug.cgi?id=220820 Bug ID: 220820 Summary: net: tcp: avoid division by zero in __tcp_select_window Product: Networking Version: 2.5 Hardware: All OS: Linux Status: NEW Severity: normal Priority: P3 Component: IPV4 Assignee: stephen@networkplumber.org Reporter: kitta@linux.alibaba.com Regression: No In the following kernel version: name:linux url:http://github.com/gregkh/linux.git branch: master commit: ac3fd01e4c1efce8f2c054cdeb2ddd2fc0fb150d bug report: ------------[ cut here ]------------ UBSAN: division-overflow in net/ipv4/tcp_output.c:3333:13 division by zero CPU: 0 UID: 0 PID: 4151 Comm: syz.0.268 Not tainted 6.18.0-rc7 #1 PREEMPT(none) Hardware name: Red Hat KVM, BIOS 1.16.0-4.al8 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x168/0x1f0 lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:233 [inline] __ubsan_handle_divrem_overflow lib/ubsan.c:351 [inline] __ubsan_handle_divrem_overflow+0x1ae/0x2a0 lib/ubsan.c:333 __tcp_select_window.cold+0x16/0x35 net/ipv4/tcp_output.c:3333 tcp_select_window net/ipv4/tcp_output.c:280 [inline] __tcp_transmit_skb+0xca3/0x38b0 net/ipv4/tcp_output.c:1565 tcp_transmit_skb net/ipv4/tcp_output.c:1646 [inline] tcp_send_active_reset+0x422/0x7e0 net/ipv4/tcp_output.c:3828 mptcp_do_fastclose.part.0+0x158/0x1e0 net/mptcp/protocol.c:2792 mptcp_do_fastclose net/mptcp/protocol.c:2779 [inline] mptcp_disconnect+0x2c6/0x9b0 net/mptcp/protocol.c:3252 inet_shutdown+0x270/0x440 net/ipv4/af_inet.c:937 __sys_shutdown_sock net/socket.c:2470 [inline] __sys_shutdown_sock net/socket.c:2464 [inline] __sys_shutdown+0x117/0x1b0 net/socket.c:2486 __do_sys_shutdown net/socket.c:2491 [inline] __se_sys_shutdown net/socket.c:2489 [inline] __x64_sys_shutdown+0x54/0x80 net/socket.c:2489 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x6e/0x940 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7ff5e46fb4dd Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 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 8b 0d 6b 89 0c 00 f7 d8 64 89 01 48 RSP: 002b:00007ff5e31f0cb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000030 RAX: ffffffffffffffda RBX: 00000000005c5fa0 RCX: 00007ff5e46fb4dd RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00000000005c5fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000005c6038 R14: 0000000000000000 R15: 00007ff5e31f1640 ---[ end trace ]--- Oops: divide error: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 4151 Comm: syz.0.268 Not tainted 6.18.0-rc7 #1 PREEMPT(none) Hardware name: Red Hat KVM, BIOS 1.16.0-4.al8 04/01/2014 RIP: 0010:__tcp_select_window+0x58a/0x1240 net/ipv4/tcp_output.c:3333 Code: e3 0f 8c 8a 02 00 00 e8 34 dc a3 fd 8b 5c 24 0c 31 ff 89 de e8 c7 d5 a3 fd 85 db 0f 84 6c 9d 36 fd e8 1a dc a3 fd 44 89 f0 99 7c 24 0c 41 29 d6 45 89 f4 e9 2a ff ff ff e8 02 dc a3 fd 48 89 RSP: 0018:ffff88800b5f7ae0 EFLAGS: 00010283 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc90000d11000 RDX: 0000000000000000 RSI: ffffffff83f30a16 RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: ffff888028a9f400 R14: 0000000000000000 R15: 0000000000000000 FS: 00007ff5e31f1640(0000) GS:ffff8880e70ab000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000f711faa0 CR3: 000000001de2e003 CR4: 0000000000770ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 PKRU: 80000000 Call Trace: tcp_select_window net/ipv4/tcp_output.c:280 [inline] __tcp_transmit_skb+0xca3/0x38b0 net/ipv4/tcp_output.c:1565 tcp_transmit_skb net/ipv4/tcp_output.c:1646 [inline] tcp_send_active_reset+0x422/0x7e0 net/ipv4/tcp_output.c:3828 mptcp_do_fastclose.part.0+0x158/0x1e0 net/mptcp/protocol.c:2792 mptcp_do_fastclose net/mptcp/protocol.c:2779 [inline] mptcp_disconnect+0x2c6/0x9b0 net/mptcp/protocol.c:3252 inet_shutdown+0x270/0x440 net/ipv4/af_inet.c:937 __sys_shutdown_sock net/socket.c:2470 [inline] __sys_shutdown_sock net/socket.c:2464 [inline] __sys_shutdown+0x117/0x1b0 net/socket.c:2486 __do_sys_shutdown net/socket.c:2491 [inline] __se_sys_shutdown net/socket.c:2489 [inline] __x64_sys_shutdown+0x54/0x80 net/socket.c:2489 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x6e/0x940 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7ff5e46fb4dd Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 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 8b 0d 6b 89 0c 00 f7 d8 64 89 01 48 RSP: 002b:00007ff5e31f0cb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000030 RAX: ffffffffffffffda RBX: 00000000005c5fa0 RCX: 00007ff5e46fb4dd RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00000000005c5fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000005c6038 R14: 0000000000000000 R15: 00007ff5e31f1640 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__tcp_select_window+0x58a/0x1240 net/ipv4/tcp_output.c:3333 Code: e3 0f 8c 8a 02 00 00 e8 34 dc a3 fd 8b 5c 24 0c 31 ff 89 de e8 c7 d5 a3 fd 85 db 0f 84 6c 9d 36 fd e8 1a dc a3 fd 44 89 f0 99 7c 24 0c 41 29 d6 45 89 f4 e9 2a ff ff ff e8 02 dc a3 fd 48 89 RSP: 0018:ffff88800b5f7ae0 EFLAGS: 00010283 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc90000d11000 RDX: 0000000000000000 RSI: ffffffff83f30a16 RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: ffff888028a9f400 R14: 0000000000000000 R15: 0000000000000000 FS: 00007ff5e31f1640(0000) GS:ffff8880e70ab000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000f711faa0 CR3: 000000001de2e003 CR4: 0000000000770ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 PKRU: 80000000 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 0f 8c 8a 02 00 00 jl 0x290 6: e8 34 dc a3 fd callq 0xfda3dc3f b: 8b 5c 24 0c mov 0xc(%rsp),%ebx f: 31 ff xor %edi,%edi 11: 89 de mov %ebx,%esi 13: e8 c7 d5 a3 fd callq 0xfda3d5df 18: 85 db test %ebx,%ebx 1a: 0f 84 6c 9d 36 fd je 0xfd369d8c 20: e8 1a dc a3 fd callq 0xfda3dc3f 25: 44 89 f0 mov %r14d,%eax 28: 99 cltd * 29: f7 7c 24 0c idivl 0xc(%rsp) <-- trapping instruction 2d: 41 29 d6 sub %edx,%r14d 30: 45 89 f4 mov %r14d,%r12d 33: e9 2a ff ff ff jmpq 0xffffff62 38: e8 02 dc a3 fd callq 0xfda3dc3f 3d: 48 rex.W 3e: 89 .byte 0x89 <<<<<<<<<<<<<<< tail report >>>>>>>>>>>>>>> division by zero CPU: 0 UID: 0 PID: 4151 Comm: syz.0.268 Not tainted 6.18.0-rc7 #1 PREEMPT(none) Hardware name: Red Hat KVM, BIOS 1.16.0-4.al8 04/01/2014 Call Trace: dump_stack_lvl+0x168/0x1f0 __ubsan_handle_divrem_overflow+0x1ae/0x2a0 __tcp_select_window.cold+0x16/0x35 __tcp_transmit_skb+0xca3/0x38b0 tcp_send_active_reset+0x422/0x7e0 mptcp_do_fastclose.part.0+0x158/0x1e0 mptcp_disconnect+0x2c6/0x9b0 inet_shutdown+0x270/0x440 __sys_shutdown+0x117/0x1b0 __x64_sys_shutdown+0x54/0x80 do_syscall_64+0x6e/0x940 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7ff5e46fb4dd Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 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 8b 0d 6b 89 0c 00 f7 d8 64 89 01 48 RSP: 002b:00007ff5e31f0cb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000030 RAX: ffffffffffffffda RBX: 00000000005c5fa0 RCX: 00007ff5e46fb4dd RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00000000005c5fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000005c6038 R14: 0000000000000000 R15: 00007ff5e31f1640 ---[ end trace ]--- Oops: divide error: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 4151 Comm: syz.0.268 Not tainted 6.18.0-rc7 #1 PREEMPT(none) Hardware name: Red Hat KVM, BIOS 1.16.0-4.al8 04/01/2014 RIP: 0010:__tcp_select_window+0x58a/0x1240 Code: e3 0f 8c 8a 02 00 00 e8 34 dc a3 fd 8b 5c 24 0c 31 ff 89 de e8 c7 d5 a3 fd 85 db 0f 84 6c 9d 36 fd e8 1a dc a3 fd 44 89 f0 99 7c 24 0c 41 29 d6 45 89 f4 e9 2a ff ff ff e8 02 dc a3 fd 48 89 RSP: 0018:ffff88800b5f7ae0 EFLAGS: 00010283 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc90000d11000 RDX: 0000000000000000 RSI: ffffffff83f30a16 RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: ffff888028a9f400 R14: 0000000000000000 R15: 0000000000000000 FS: 00007ff5e31f1640(0000) GS:ffff8880e70ab000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000f711faa0 CR3: 000000001de2e003 CR4: 0000000000770ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 PKRU: 80000000 Call Trace: __tcp_transmit_skb+0xca3/0x38b0 tcp_send_active_reset+0x422/0x7e0 mptcp_do_fastclose.part.0+0x158/0x1e0 mptcp_disconnect+0x2c6/0x9b0 inet_shutdown+0x270/0x440 __sys_shutdown+0x117/0x1b0 __x64_sys_shutdown+0x54/0x80 do_syscall_64+0x6e/0x940 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7ff5e46fb4dd Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 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 8b 0d 6b 89 0c 00 f7 d8 64 89 01 48 RSP: 002b:00007ff5e31f0cb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000030 RAX: ffffffffffffffda RBX: 00000000005c5fa0 RCX: 00007ff5e46fb4dd RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00000000005c5fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000005c6038 R14: 0000000000000000 R15: 00007ff5e31f1640 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__tcp_select_window+0x58a/0x1240 Code: e3 0f 8c 8a 02 00 00 e8 34 dc a3 fd 8b 5c 24 0c 31 ff 89 de e8 c7 d5 a3 fd 85 db 0f 84 6c 9d 36 fd e8 1a dc a3 fd 44 89 f0 99 7c 24 0c 41 29 d6 45 89 f4 e9 2a ff ff ff e8 02 dc a3 fd 48 89 RSP: 0018:ffff88800b5f7ae0 EFLAGS: 00010283 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc90000d11000 RDX: 0000000000000000 RSI: ffffffff83f30a16 RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: ffff888028a9f400 R14: 0000000000000000 R15: 0000000000000000 FS: 00007ff5e31f1640(0000) GS:ffff8880e70ab000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000f711faa0 CR3: 000000001de2e003 CR4: 0000000000770ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 PKRU: 80000000 <<<<<<<<<<<<<<< tail report >>>>>>>>>>>>>>> -- You may reply to this email to add a comment. 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