From nobody Thu Apr 2 23:53:32 2026 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 4375D3E928D for ; Thu, 26 Mar 2026 10:49:41 +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=1774522182; cv=none; b=qtOXNqJQGqKeL7LH9abcE/uW8Wnen2Tdxd3RY8HRtpvQwhhsnlyglk446cAdweuZGe1CoNT2hkMRUCqIMF7RGr9Yxt9YNvrHNoU+vgmKu+18v+XEzIqYDvvgsQ1ECtmhCmrBBFs2mll7Ku28CWutG/EYJOCYx7Ifb8y2dGDmQO8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774522182; c=relaxed/simple; bh=/pg2sx7Ejglo3JyXv0SQ28GfSrx8nv9BNocJEl2xiZQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HKsi/vCVsS66J0HjCXXam7ERgNdxkOfqXrAlOJAzfaAsW5NYvoI3PZjyX/CwE3lFqHOsyc3fFT2EjFQWlzxnBEYywNGWZKCALkcm9quSxROwIXm5Jy1MGCFcDrGz9V9C29iAA1l8CTICxZSjCUIMgjfpeswI4xjoRcGgc9/xmq0= 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=hybBFWhI; 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="hybBFWhI" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1774522180; 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=qTXHjK3561HUqXOE5w7QS6ZLr4v2K1LxsVJ31tdrxyM=; b=hybBFWhIKqc5CVh3AycWKZfsWFMEuqY1rpQNdcLHlp6MEK2NVCwhyBFDuG6lFyBeK9cilS /ROPH9fksVw0t1ag+t2AIwmkyj9lwYtz0XqOdEXEMCWuAbnSsmVxdtOHBdKC95+GJ+tGBC HoQFrqShzjBHC8RFN62PowZJ2fn/e9Y= 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: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Content-Type: text/plain; charset="utf-8" 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_subr= equest *subreq) break; } =20 + if (subreq->transferred > subreq->len) { + subreq->transferred =3D 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 =3D -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 ") \