From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f70.google.com (mail-io1-f70.google.com [209.85.166.70]) (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 E52E746AF for ; Thu, 23 May 2024 08:33:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.70 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716453218; cv=none; b=DKvbNjGFF4ajBo+MgrEFGzEd9k34ZEqJz61lX5sN/hFhrViA4B9RQyKdwC72HQNJN7m90g/hiBt1CDbYkq0UTivS1LxFDmw/sNS9j5SkfbGBUY68EBK4eyH67mkdhBiq725VynNPwTavaqncRzeH4ll1KOqrRJRczS47KpauEQE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716453218; c=relaxed/simple; bh=v1Wpfd5pymv2nX9Revy1NHAYOMkvBeSoU+9s45OonyU=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=KZYz2cu5emaOmDEi+P+53KM/gFfsOKlRM/8cjnoeZXPaCNEVfE8FAKqTZXkFAKExul0sndtm4Pm490839QsZ0MX/8dDx3Wy2VojP47YMz1wdYfMZeghgIElQutmylwgwQkODVVMDFhvRzlF41D6UzSTnDV81K2ggbocGmkBnQlE= 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=209.85.166.70 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-f70.google.com with SMTP id ca18e2360f4ac-7e1d3928fd4so132162239f.3 for ; Thu, 23 May 2024 01:33:36 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1716453216; x=1717058016; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=ySwK4GW7MrBSOkmkCOo1wVWVNGzzwCbDdwGNcEIbngc=; b=DRQRPdLRWfeTvKe6PczXrT+ynO7nIPbK3IV0OgzmZ68Vqiq1E9mvQcZdm9V1BP9x+k OznBcJFDjC9uosiTgbljXKew+CSjKK+ksiy9sXbLm0Tp4oqb3ETo5TTdCZs2CwjW7XBb RhouKzX75hrYcWyeHJeL6jw5w09B4f+jVibsr01GH70QHw6LzQJmtADeuSmiNaYGuAHu 8+Labx5tC2JPzxjO2zZgMTYLFgujFixTbyqo58ccfvChmxAWfDegTDaEMyP5OzEdXOhn zcBOPtANMjZXOFDe49rj/Y18kJ22ZOyyFmL9L9adMd3eqK9Wp5NpBbM5pa0Kreqwqg5g 624Q== X-Gm-Message-State: AOJu0YxFKaPGTLcs1djwU3QxnS8uSRyM3YnE63m2mra34Le3BwS+ejX+ ny3+PIlM+RUWEzIbQcX1ryAiiLCkGi36m3JyBmQa4xBsfdcVFqUKaAzaL1tGz2HeLOkrawSaPIu Ocu8V23Bt56NCxdg3A02D7k5cXia1P963EFYbU9lNzmegn8pp3dzSQK0= X-Google-Smtp-Source: AGHT+IHbmIQFE/GYihol8gquRtVvReYzw04EJjwwXg51W7zoP8t2XOPblgAWQu76wHD46jMBGchCSNOEez1fZcncjjox/g6YOv1R Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6638:6907:b0:488:59cc:eb42 with SMTP id 8926c6da1cb9f-4afe3c40ccbmr70028173.3.1716453216047; Thu, 23 May 2024 01:33:36 -0700 (PDT) Date: Thu, 23 May 2024 01:33:36 -0700 In-Reply-To: <0000000000002fd2de0618de2e65@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000037689606191ae804@google.com> Subject: Re: [syzbot] [syzbot] [fs?] general protection fault in iter_file_splice_write From: syzbot To: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org. *** Subject: [syzbot] [fs?] general protection fault in iter_file_splice_write Author: lizhi.xu@windriver.com #syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 33e02dc69afb diff --git a/fs/splice.c b/fs/splice.c index 60aed8de21f8..a7d59b2f1804 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -751,8 +751,18 @@ iter_file_splice_write(struct pipe_inode_info *pipe, struct file *out, /* dismiss the fully eaten buffers, adjust the partial one */ tail = pipe->tail; - while (ret) { + while (ret > 0) { struct pipe_buffer *buf = &pipe->bufs[tail & mask]; + printk("ret: %d, nbufs: %d, buf len: %u, m: %u, t: %u,ring size: %u, %s\n", ret, nbufs, buf->len, mask, tail, pipe->ring_size, __func__); + if (pipe->ring_size <= mask) { + ret = -EPIPE; + printk("oooh, %s\n", __func__); + break; + } + if (!buf->len) { + tail++; + continue; + } if (ret >= buf->len) { ret -= buf->len; buf->len = 0;