From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 330D13F87E2 for ; Thu, 26 Mar 2026 10:49:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774522184; cv=none; b=n571xw6B19CorzWktlgcjrJKTEOA0r7NfC+oMyG3yQ4dZIu9sTZM2hSJ52eOgHxr0K2bjX3MvWYV5VlzMaOhRLoF0f03Hv2Oe6lbXdSHnt/iwUYfcLFE7V2ukdLK6xApgE7nxEuuPS2YOsQbjA1PhMTKkRm2HboN2QLrNJqHtlc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774522184; c=relaxed/simple; bh=/pg2sx7Ejglo3JyXv0SQ28GfSrx8nv9BNocJEl2xiZQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:content-type; b=VIygKw150ZcMsPFDonn5vVUcntzN3JVrFYKXF4SxzRry6u0QYX1YuQ6LM70L5xvXIM4YjqpVCRCgXkclP3dweI2K/3zq+HmJa8mvJWme7rQtct0EBI0YD+oLU5fa1jxoyL04EEKseJ7Ifun3OslcXIimuG+1IRIuP5HoudU2GHw= 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=XzT/J6sh; arc=none smtp.client-ip=170.10.129.124 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="XzT/J6sh" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1774522182; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=qTXHjK3561HUqXOE5w7QS6ZLr4v2K1LxsVJ31tdrxyM=; b=XzT/J6shEi5MloMYTlGuYEvRrbbbOa1NRifsJwdrcZPf1lfsd9aEgBA7GBFmQILa8hOd0o JJXhUU4Tnh5KJ0E9OlcbAV4Ek7vzoVcNPQWVb2Iofn9h9h19K8gdJkmm6mNEaWwlH6lT1t GC+yFUnfobkUFSOBN/TcpsTsYAlS8lk= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-515-MLTlG43wMQ6WTJVEzCwapg-1; Thu, 26 Mar 2026 06:49:37 -0400 X-MC-Unique: MLTlG43wMQ6WTJVEzCwapg-1 X-Mimecast-MFC-AGG-ID: MLTlG43wMQ6WTJVEzCwapg_1774522174 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (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-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 601471956048; Thu, 26 Mar 2026 10:49:34 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.44.33.121]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id EBE4B3000223; Thu, 26 Mar 2026 10:49:27 +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 , Trond Myklebust , 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, Paulo Alcantara Subject: [PATCH 24/26] netfs: Check for too much data being read Date: Thu, 26 Mar 2026 10:45:39 +0000 Message-ID: <20260326104544.509518-25-dhowells@redhat.com> In-Reply-To: <20260326104544.509518-1-dhowells@redhat.com> References: <20260326104544.509518-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: netfs@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 X-Mimecast-MFC-PROC-ID: T16nhYmapuKybRUQeHvFEUQz8XtMy50nAIFmfFGaliU_1774522174 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true 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 c7180680226c..bacf047029fa 100644 --- a/fs/netfs/read_collect.c +++ b/fs/netfs/read_collect.c @@ -545,6 +545,14 @@ 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 df3d440563ec..eeb8386e0709 100644 --- a/include/trace/events/netfs.h +++ b/include/trace/events/netfs.h @@ -125,6 +125,7 @@ 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 ") \