From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f69.google.com (mail-io1-f69.google.com [209.85.166.69]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2978A1B151A for ; Thu, 4 Jul 2024 16:33:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.69 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720110803; cv=none; b=AlrSJdSgM8krweQ5vO5LiO+zIdRd4BWvFWK3Yoq5q9i2PPV7wzXZYzP17Ag37+QlQk0st+2aYCymo783bCEeCTmqmv4qCRZny2CcCiTVd0iNjUkRgFYBU3VgiidbrubUti05t76eLbyof8YrK0GIgaMdbJg01g8vLPS2vr2CrbE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720110803; c=relaxed/simple; bh=5ITx1Qun66+GeWVbD/FYi+IU72IBJ5jSnCo7fyr73LI=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=WOo9d5wMTcbc+iPbOQ+KxZF20rMF32+RiNOLB9PGheJvE+NXz3ThObliK6jjoZ/mtXJ5X9dERNQwGwANzQAOwduEQ9dHmbsvPJo5fW3DqD4L33O25y6PO5t23y3QrbOPJjL7ZN20C9HNBOa8+nmvHTOdKS5YK5tsCBVORw4WUOk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.69 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-io1-f69.google.com with SMTP id ca18e2360f4ac-7f3ccfec801so92765039f.3 for ; Thu, 04 Jul 2024 09:33:21 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1720110801; x=1720715601; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=tG35q1StV/2z7cK6mhk2/Wuuk7vbrJGi0KGHNAimHPA=; b=raaEZrou6s5QAuO78SVRSBiOx3HZ5tBsRPLeLw1COywUHNbYqmNUrEDVdkFvMOekvV bYYeAblSnhu5SgdFmw+AdBvZvo45PXoXH9ve3nSWmNSsZB0RRJBEp2iDqoq5UV9Exuzf 6mQdFDwkXxz6O6eCr42VIrIpBJTxIQKWFqO/QuGB0GVEXaZaqokM9NC5soMiGUsMg346 XTefCzLdwXnedpaP6+KWLiqUWE1p461f3gkK5T5g7eh61Oa6xIIQQjZ//J9S6lhnQIDs lFD6cyCm8XU2UfbJ1n3CCPCvfV4aUddkBmFx2aC2s6cL+8qLt3n6PuJNvg2OAvtB2d2R SmUQ== X-Forwarded-Encrypted: i=1; AJvYcCWd6iRKTQ67d9wEKes+CPENFB9DCEex8ZkfKc21kiZVp4D96uWxGbiJzHlIyCFb/Y1AE0z69UoqnavEPt45kH6WAooB+Dc5 X-Gm-Message-State: AOJu0YxGbBF4RMGpuUk3gIww+a85eM7ZIeGujjXRA3Llaqbq2H5Uq79Q KWe15DFeltFS2VifyTD/4TNvxlzC78LWqYyXBAh0YH6TSnYTFJ/X9F4kIWhyFyJNKrzQgp+F87X FFONZIAwH7Sfz/vXFDi0RGflQ/lUXQ34lDl5Y1YHL5wtxtlQJ+i53S3A= X-Google-Smtp-Source: AGHT+IGSvKTeR4Ftvy1VSZCCfNPptop45KTh2jm8edQ3/bXDMb60Xma0Hv5Zvta3bZoSo08lS7A2VoxJseIgu1kmLWrHdEMYJWDv Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6638:13cf:b0:4b9:e5b4:67fd with SMTP id 8926c6da1cb9f-4bf60321c8amr163624173.1.1720110801300; Thu, 04 Jul 2024 09:33:21 -0700 (PDT) Date: Thu, 04 Jul 2024 09:33:21 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000494468061c6e81ea@google.com> Subject: [syzbot] [ppp?] KMSAN: uninit-value in ppp_async_push (3) From: syzbot To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-ppp@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: 614da38e2f7a Merge tag 'hid-for-linus-2024051401' of git:/.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1315203c980000 kernel config: https://syzkaller.appspot.com/x/.config?x=f5d2cbf33633f507 dashboard link: https://syzkaller.appspot.com/bug?extid=ec0723ba9605678b14bf compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14b284e8980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1653d768980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/89eafb874b71/disk-614da38e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/356000512ad9/vmlinux-614da38e.xz kernel image: https://storage.googleapis.com/syzbot-assets/839c73939115/bzImage-614da38e.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ec0723ba9605678b14bf@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in ppp_async_encode drivers/net/ppp/ppp_async.c:548 [inline] BUG: KMSAN: uninit-value in ppp_async_push+0xc05/0x2660 drivers/net/ppp/ppp_async.c:675 ppp_async_encode drivers/net/ppp/ppp_async.c:548 [inline] ppp_async_push+0xc05/0x2660 drivers/net/ppp/ppp_async.c:675 ppp_async_send+0x130/0x1b0 drivers/net/ppp/ppp_async.c:634 ppp_push+0x220/0x22b0 drivers/net/ppp/ppp_generic.c:1883 ppp_send_frame drivers/net/ppp/ppp_generic.c:1846 [inline] __ppp_xmit_process+0x123a/0x2780 drivers/net/ppp/ppp_generic.c:1646 ppp_xmit_process+0x100/0x2b0 drivers/net/ppp/ppp_generic.c:1667 ppp_write+0x63a/0x7d0 drivers/net/ppp/ppp_generic.c:521 do_loop_readv_writev fs/read_write.c:764 [inline] vfs_writev+0xb0e/0x1450 fs/read_write.c:973 do_pwritev fs/read_write.c:1072 [inline] __do_sys_pwritev fs/read_write.c:1119 [inline] __se_sys_pwritev fs/read_write.c:1114 [inline] __x64_sys_pwritev+0x2e5/0x500 fs/read_write.c:1114 x64_sys_call+0x3539/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:297 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: slab_post_alloc_hook mm/slub.c:3877 [inline] slab_alloc_node mm/slub.c:3918 [inline] kmem_cache_alloc_node+0x622/0xc90 mm/slub.c:3961 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:577 __alloc_skb+0x35b/0x7a0 net/core/skbuff.c:668 alloc_skb include/linux/skbuff.h:1319 [inline] ppp_write+0xe5/0x7d0 drivers/net/ppp/ppp_generic.c:509 do_loop_readv_writev fs/read_write.c:764 [inline] vfs_writev+0xb0e/0x1450 fs/read_write.c:973 do_pwritev fs/read_write.c:1072 [inline] __do_sys_pwritev fs/read_write.c:1119 [inline] __se_sys_pwritev fs/read_write.c:1114 [inline] __x64_sys_pwritev+0x2e5/0x500 fs/read_write.c:1114 x64_sys_call+0x3539/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:297 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 1 PID: 5049 Comm: syz-executor420 Not tainted 6.9.0-syzkaller-02707-g614da38e2f7a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 ===================================================== --- 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