From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 22466441035 for ; Tue, 16 Jun 2026 10:12:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781604750; cv=none; b=HDdzBF22I4nYcoiwm6RZgyXYi+N1HNTqRtND4r7HCOlGZyAJHmLXbO/lHYVBnv6e3ZOnUIv87ow56LwNmaTRSRbAhaIUBefyz2ZjoYLNHufEfa2Ybmew3ppRe4hhC3Gov4GYcuwuiuYCmkzPQ++nfJwzjafM2DRP4DGcHlpmHvE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781604750; c=relaxed/simple; bh=HLoxeFhghYgcnPTyOszlBWDi3KZJSiCbsQEjzraQKRI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=klzLoHH0TdYuLNdhOPnnG9niPqnc+xcjwVpanj3ts60maGDUSuWBrrpWcntD/5uSRjkesB5UdOZzyhP6Sef9Kgv75mHnmwOOlGrO9Lud/mIhfrCB1nzg7+Ln2SApBwzSvgjHL/NCLcIhQQ3FtXvQN7pT6c/P4EbCdELo30WarLk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=Qz5cVACW; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Qz5cVACW" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1781604747; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=HfX4hKOxHGk+bf7dAxE3qPG38R5aFPeh/NdzY9CtdfI=; b=Qz5cVACWqh78uQGiKyu92r/g1TH3qSI5w510sjYalTipgNw9z9ODNn7wa9YAmuiIJAEYmp 7QQf+DuVCoMKBbEzK/Na/aunj6NVVsmE4sE4TIwrmHq/x4gk8b6JGFLAkm/YfKN3x7NmAl cwYAEzqhoXWmeTmFq+aQUYjrTUExhJU= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-454-jgW8GiYSNzSI7PbtLwwkgg-1; Tue, 16 Jun 2026 06:12:21 -0400 X-MC-Unique: jgW8GiYSNzSI7PbtLwwkgg-1 X-Mimecast-MFC-AGG-ID: jgW8GiYSNzSI7PbtLwwkgg_1781604736 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 5A4EB180ACE5; Tue, 16 Jun 2026 10:12:13 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.44.50.44]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 7A773180034F; Tue, 16 Jun 2026 10:12:07 +0000 (UTC) From: David Howells To: Christian Brauner , Matthew Wilcox , Christoph Hellwig Cc: David Howells , Paulo Alcantara , Jens Axboe , Leon Romanovsky , Steve French , ChenXiaoSong , Marc Dionne , Eric Van Hensbergen , Dominique Martinet , Ilya Dryomov , netfs@lists.linux.dev, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs@lists.linux.dev, linux-erofs@lists.ozlabs.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 27/30] netfs: Check for too much data being read Date: Tue, 16 Jun 2026 11:08:16 +0100 Message-ID: <20260616100821.2062304-28-dhowells@redhat.com> In-Reply-To: <20260616100821.2062304-1-dhowells@redhat.com> References: <20260616100821.2062304-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 Put in a check in read subreq termination to detect more data being read for a subrequest than was requested. Signed-off-by: David Howells cc: Paulo Alcantara cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org --- fs/netfs/read_collect.c | 8 ++++++++ include/trace/events/netfs.h | 1 + 2 files changed, 9 insertions(+) diff --git a/fs/netfs/read_collect.c b/fs/netfs/read_collect.c index 802d1c40cce5..9efcc0e63a96 100644 --- a/fs/netfs/read_collect.c +++ b/fs/netfs/read_collect.c @@ -543,6 +543,14 @@ void netfs_read_subreq_terminated(struct netfs_io_subrequest *subreq) break; } + if (subreq->transferred > subreq->len) { + subreq->transferred = 0; + __set_bit(NETFS_SREQ_FAILED, &subreq->flags); + __clear_bit(NETFS_SREQ_NEED_RETRY, &subreq->flags); + trace_netfs_sreq(subreq, netfs_sreq_trace_too_much); + subreq->error = -EIO; + } + /* Deal with retry requests, short reads and errors. If we retry * but don't make progress, we abandon the attempt. */ diff --git a/include/trace/events/netfs.h b/include/trace/events/netfs.h index 59f330003d02..cc29582f6245 100644 --- a/include/trace/events/netfs.h +++ b/include/trace/events/netfs.h @@ -134,6 +134,7 @@ EM(netfs_sreq_trace_submit, "SUBMT") \ EM(netfs_sreq_trace_superfluous, "SPRFL") \ EM(netfs_sreq_trace_terminated, "TERM ") \ + EM(netfs_sreq_trace_too_much, "!TOOM") \ EM(netfs_sreq_trace_wait_for, "_WAIT") \ EM(netfs_sreq_trace_write, "WRITE") \ EM(netfs_sreq_trace_write_skip, "SKIP ") \