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 185423C6A26 for ; Wed, 4 Mar 2026 14:05:36 +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=1772633138; cv=none; b=rkQFitNjpa8Bzd5CFH9w8eB5VoH91FDp9lPz3MZVqsKZ1/F8sGjOn1rCvPNrIpzRoMqyZTzqFumK3dROQuqIrBQ8rPg6dqwn9bLOgq/6s4LTSfmSLO6hgrMrx7bAgFZOUY/V9SdBhfe32ULUJJJehghIWpgoQ3IxYaUYtuyxdAQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772633138; c=relaxed/simple; bh=QxdQukoNegxt7cys2Ne0RaX+CMcxVII0TxVF64PClMU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=oj0Zlcl+s6O7a9Ijhx2C0laiowTTHQZZTNt1XVmnLrKee7un2Rju4Aix8HW3Wf8iQ+WtSprNKaWaz9UPBEjtTxtT3pviPN0Xys1AEa6EX7LChAotAYz918t7bXovagQfxaMOhw4T20utihMoCUYwpBq13YvnEI33S9px3oABZm4= 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=XV2EZ6ly; 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="XV2EZ6ly" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1772633136; 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=8d8J22DaSQuOQSD54Wg05WTtU42gahs7pGBkEdp1IFY=; b=XV2EZ6ly52q3xrtVUJuDUXXU4IXu65/hy3aT3fIW7xweuReVVAeQVp2H1aoH5t2yMwCI6l d8xg9HNrBlpddJeit5kMT/COHrv3ZVSqcuZNVedfCZ6bkUNIbEr3FQmhlZNVK4LYWrDLkj s5hgvb0RZgSf6dlET52itsFpyOjzQ9U= 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-226-XleRjEHKMWuPDQMBbTTDJg-1; Wed, 04 Mar 2026 09:05:31 -0500 X-MC-Unique: XleRjEHKMWuPDQMBbTTDJg-1 X-Mimecast-MFC-AGG-ID: XleRjEHKMWuPDQMBbTTDJg_1772633129 Received: from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93]) (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 A3526195606C; Wed, 4 Mar 2026 14:05:29 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.44.32.194]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 206DF180049D; Wed, 4 Mar 2026 14:05:24 +0000 (UTC) From: David Howells To: Matthew Wilcox , Christoph Hellwig , Jens Axboe , Leon Romanovsky Cc: David Howells , Christian Brauner , Paulo Alcantara , 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-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Paulo Alcantara Subject: [RFC PATCH 16/17] netfs: Check for too much data being read Date: Wed, 4 Mar 2026 14:03:23 +0000 Message-ID: <20260304140328.112636-17-dhowells@redhat.com> In-Reply-To: <20260304140328.112636-1-dhowells@redhat.com> References: <20260304140328.112636-1-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 10.30.177.93 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 3b5978832369..20c80df8914f 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 861dc7849067..899b85d7ef92 100644 --- a/include/trace/events/netfs.h +++ b/include/trace/events/netfs.h @@ -124,6 +124,7 @@ 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 ") \