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AJvYcCWbodgr6p10SwpgAk41wfao/2CT5daV/167URkqxXZ0ZlY6KF41W458YJ4bbDysv28xoxU9mwc=@vger.kernel.org X-Gm-Message-State: AOJu0YwT+jfCQRTNqjGcfZlywwCYWQ2nt4m9L/lxI/fo2oU/GLZnFXmh yrACJfR/XbV4fROn68LFPjYtyDv46Uq3k2Tbdkmm6471cr0yNO9T/NkH/fXR0c1qX2a7Vn01nZA eCf0f4dEMTLHEhUCGGJX94EpZvmu/7mNVOoedPHeES2XaXW2Hwppxj5sZJqc= X-Google-Smtp-Source: AGHT+IHNW1jYIesUGOjqdbDQy35MMrSQ++myxvFepafLZ7BQnCBxgqG/kCFgc7gR9FKInPo6fjOE/kP3dpmUBb+Oo/BdaWuvO4Gv Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:12ee:b0:3dc:8423:5440 with SMTP id e9e14a558f8ab-3de00a151f1mr9928625ab.0.1749771686333; Thu, 12 Jun 2025 16:41:26 -0700 (PDT) Date: Thu, 12 Jun 2025 16:41:26 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <684b65a6.050a0220.be214.0295.GAE@google.com> Subject: [syzbot] [atm?] KMSAN: uninit-value in atmtcp_c_send From: syzbot To: 3chas3@gmail.com, linux-atm-general@lists.sourceforge.net, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 2c4a1f3fe03e Merge tag 'bpf-fixes' of git://git.kernel.org.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1787d9d4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=42d51b7b9f9e61d dashboard link: https://syzkaller.appspot.com/bug?extid=1d3c235276f62963e93a 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=1195ed70580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16187682580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1313b3ad2bf4/disk-2c4a1f3f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/15f719cfdf88/vmlinux-2c4a1f3f.xz kernel image: https://storage.googleapis.com/syzbot-assets/e7f531b0bef6/bzImage-2c4a1f3f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1d3c235276f62963e93a@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in atmtcp_c_send+0x255/0xed0 drivers/atm/atmtcp.c:294 atmtcp_c_send+0x255/0xed0 drivers/atm/atmtcp.c:294 vcc_sendmsg+0xd7c/0xff0 net/atm/common.c:644 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x330/0x3d0 net/socket.c:727 ____sys_sendmsg+0x7e0/0xd80 net/socket.c:2566 ___sys_sendmsg+0x271/0x3b0 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+0x211/0x3e0 net/socket.c:2655 x64_sys_call+0x32fb/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: slab_post_alloc_hook mm/slub.c:4154 [inline] slab_alloc_node mm/slub.c:4197 [inline] kmem_cache_alloc_node_noprof+0x818/0xf00 mm/slub.c:4249 kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:579 __alloc_skb+0x347/0x7d0 net/core/skbuff.c:670 alloc_skb include/linux/skbuff.h:1336 [inline] vcc_sendmsg+0xb40/0xff0 net/atm/common.c:628 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x330/0x3d0 net/socket.c:727 ____sys_sendmsg+0x7e0/0xd80 net/socket.c:2566 ___sys_sendmsg+0x271/0x3b0 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+0x211/0x3e0 net/socket.c:2655 x64_sys_call+0x32fb/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 1 UID: 0 PID: 5798 Comm: syz-executor192 Not tainted 6.16.0-rc1-syzkaller-00010-g2c4a1f3fe03e #0 PREEMPT(undef) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ===================================================== --- 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