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AHgh+Rpfa7BOPLiKRBwxa1n3e89vX/5KwZNhgO6f2x0wy8U2Fx5ddIciJlyK83mF/hFT1gfmseUAxoA=@vger.kernel.org X-Gm-Message-State: AFuF++mOnQm0aAil66SCjKTONUeYM/x1F891ROabIU7uPtOzF6MJm1Tc RBwsv1HhYk+3x10RdyesuJtUTDfSaUd2VxA7wtzo7qqwrSGpQecJePbK/YbwyaD/yhiqfsj5cQW aIZG7GSB4A9HG4M3wv0GtAZwNKaHspI6+rdX0zALwOa7q4Hbvytgg8i1TrcU= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:c2cc:10b0:6b1:8ebb:7efd with SMTP id 006d021491bc7-6b1a03672a4mr4766496eaf.4.1787746715710; Wed, 26 Aug 2026 05:18:35 -0700 (PDT) Date: Wed, 26 Aug 2026 05:18:35 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a8ed99b.1d9ded08.62e62.00ab.GAE@google.com> Subject: [syzbot] [net?] [usb?] UBSAN: shift-out-of-bounds in __vcc_connect From: syzbot To: 3chas3@gmail.com, davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-atm-general@lists.sourceforge.net, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 26260251022f Merge tag 'livepatching-for-7.3' of git://git.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=14fa5179580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a70bec3546180b6 dashboard link: https://syzkaller.appspot.com/bug?extid=f6ac161ee9699270b8dd compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12698625580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/858149e586b7/disk-26260251.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/8c4a5ad34e66/vmlinux-26260251.xz kernel image: https://storage.googleapis.com/syzbot-assets/fa4efe98315e/bzImage-26260251.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f6ac161ee9699270b8dd@syzkaller.appspotmail.com ------------[ cut here ]------------ UBSAN: shift-out-of-bounds in net/atm/common.c:382:32 shift exponent -1 is negative CPU: 0 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 08/05/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 ubsan_epilogue+0xa/0x30 lib/ubsan.c:233 __ubsan_handle_shift_out_of_bounds+0x36d/0x400 lib/ubsan.c:494 __vcc_connect+0x14b4/0x19c0 net/atm/common.c:382 vcc_connect+0x328/0x8f0 net/atm/common.c:498 pvc_bind+0x272/0x380 net/atm/pvc.c:52 __sys_bind_socket net/socket.c:1945 [inline] __sys_bind+0x2e3/0x410 net/socket.c:1976 __do_sys_bind net/socket.c:1981 [inline] __se_sys_bind net/socket.c:1979 [inline] __x64_sys_bind+0x7a/0x90 net/socket.c:1979 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc16739e0d9 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:00007fff0c105ee8 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 00007fc167625fa0 RCX: 00007fc16739e0d9 RDX: 000000000000000c RSI: 0000200000000300 RDI: 0000000000000004 RBP: 00007fc167435024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc167625fac R14: 00007fc167625fa0 R15: 00007fc167625fa0 ---[ end trace ]--- --- 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@googlegroups.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