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GET /api/1.1/patches/2222709/?format=api
{ "id": 2222709, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2222709/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260413214549.926435-4-junjie.cao@intel.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/1.1/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20260413214549.926435-4-junjie.cao@intel.com>", "date": "2026-04-13T21:45:48", "name": "[v3,3/4] migration/file: fix type mismatch and NULL deref in multifd_file_recv_data", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "cab439379d07cdfb6d7f13ba6e02db5c52239260", "submitter": { "id": 91537, "url": "http://patchwork.ozlabs.org/api/1.1/people/91537/?format=api", "name": "Junjie Cao", "email": "junjie.cao@intel.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260413214549.926435-4-junjie.cao@intel.com/mbox/", "series": [ { "id": 499708, "url": "http://patchwork.ozlabs.org/api/1.1/series/499708/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=499708", "date": "2026-04-13T21:45:46", "name": "io/channel: complete pread/pwrite_all API and fix multifd_file_recv_data", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/499708/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2222709/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2222709/checks/", "tags": {}, "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256\n header.s=Intel header.b=JuPavCBX;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists1p.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)" ], "Received": [ "from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fvTGh0cBjz1xtJ\n\tfor <incoming@patchwork.ozlabs.org>; Mon, 13 Apr 2026 23:46:52 +1000 (AEST)", "from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists1p.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from <qemu-devel-bounces@nongnu.org>)\n\tid 1wCHcY-00057K-B6; Mon, 13 Apr 2026 09:46:34 -0400", "from eggs.gnu.org ([2001:470:142:3::10])\n by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <junjie.cao@intel.com>)\n id 1wCHcX-00056l-1g\n for qemu-devel@nongnu.org; Mon, 13 Apr 2026 09:46:33 -0400", "from mgamail.intel.com ([198.175.65.14])\n by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <junjie.cao@intel.com>)\n id 1wCHcV-0002H1-GE\n for qemu-devel@nongnu.org; Mon, 13 Apr 2026 09:46:32 -0400", "from orviesa005.jf.intel.com ([10.64.159.145])\n by orvoesa106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384;\n 13 Apr 2026 06:46:30 -0700", "from junjie-optiplex-micro-plus-7010.bj.intel.com ([10.238.152.98])\n by orviesa005-auth.jf.intel.com with\n ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Apr 2026 06:46:29 -0700" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple;\n d=intel.com; i=@intel.com; q=dns/txt; s=Intel;\n t=1776087992; x=1807623992;\n h=from:to:cc:subject:date:message-id:in-reply-to:\n references:mime-version:content-transfer-encoding;\n bh=jRIYr/DJPikQoTUtLLf24NEzeIOFia6aU6GKa/BmoKA=;\n b=JuPavCBXydKLribUPiYNn7ONXxn6tvNffsOv1MzoYyZdX+uIPCFWBHq6\n a7QcWHekemdFdKBsBUtnkQbYtMvVAtw4yXW/UuLU+DlzBv7ahdBi3AMev\n cVgxd2Gm3+uLfAUHIjREqucHL2keofRuiS0V/DMBliHrZeMIBqjGC/gaI\n UvED3JHS5YWSjrOwmXRiqM7TgElYr6s0XhIcKVIA+IWps4SiVPN/XcF8o\n FsGEjAgw3eDyqgx/ZMHNzG0KhnPR/ZBaZVnI1KKXv7O+Dcl77g52TNsFD\n fWjV2vhHjwMrNWfNJKEV0RLZq9Zvtyneeq198rc8uMh8LDIMCqjiZ9sIu Q==;", "X-CSE-ConnectionGUID": [ "HFgKHtr+TIC+F5/5Z6eEiA==", "mRaTV8cTR++7NbeU2U3tEA==" ], "X-CSE-MsgGUID": [ "8M0HvRKgSwqlJyA52+tIxw==", "ffP93G3MQ9SAB2yOrdMGKw==" ], "X-IronPort-AV": [ "E=McAfee;i=\"6800,10657,11758\"; a=\"80885675\"", "E=Sophos;i=\"6.23,177,1770624000\"; d=\"scan'208\";a=\"80885675\"", "E=Sophos;i=\"6.23,177,1770624000\"; d=\"scan'208\";a=\"234770429\"" ], "X-ExtLoop1": "1", "From": "Junjie Cao <junjie.cao@intel.com>", "To": "qemu-devel@nongnu.org", "Cc": "berrange@redhat.com, peterx@redhat.com, farosas@suse.de,\n junjie.cao@intel.com", "Subject": "[PATCH v3 3/4] migration/file: fix type mismatch and NULL deref in\n multifd_file_recv_data", "Date": "Tue, 14 Apr 2026 05:45:48 +0800", "Message-ID": "<20260413214549.926435-4-junjie.cao@intel.com>", "X-Mailer": "git-send-email 2.43.0", "In-Reply-To": "<20260413214549.926435-1-junjie.cao@intel.com>", "References": "<20260413214549.926435-1-junjie.cao@intel.com>", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=UTF-8", "Content-Transfer-Encoding": "8bit", "Received-SPF": "pass client-ip=198.175.65.14;\n envelope-from=junjie.cao@intel.com;\n helo=mgamail.intel.com", "X-Spam_score_int": "-29", "X-Spam_score": "-3.0", "X-Spam_bar": "---", "X-Spam_report": "(-3.0 / 5.0 requ) BAYES_00=-1.9, DATE_IN_FUTURE_06_12=1.947,\n DKIMWL_WL_HIGH=-0.54, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1,\n DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001,\n SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no", "X-Spam_action": "no action", "X-BeenThere": "qemu-devel@nongnu.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "multifd_file_recv_data() stores the return value of qio_channel_pread()\n(ssize_t) in a size_t variable. On I/O error the -1 return value wraps\nto SIZE_MAX, producing a nonsensical read size in the error message.\n\nMore critically, a short read (0 <= ret < data->size) is possible when\nthe migration file is truncated. In that case qio_channel_pread()\nreturns a non-negative value without setting *errp. The function then\ncalls error_prepend(errp, ...) which dereferences *errp -- a NULL\npointer -- crashing QEMU.\n\nFix both issues by switching to qio_channel_pread_all() introduced in\na previous patch, which retries on short reads and treats end-of-file\nas an error, so the caller no longer needs to check the byte count\nmanually. Add ERRP_GUARD() so that error_prepend() works correctly\neven when errp is &error_fatal or NULL.\n\nFixes: a49d15a38d3d (\"migration/multifd: Support incoming mapped-ram stream format\")\nSuggested-by: Peter Xu <peterx@redhat.com>\nReviewed-by: Daniel P. Berrangé <berrange@redhat.com>\nSigned-off-by: Junjie Cao <junjie.cao@intel.com>\n---\n migration/file.c | 13 +++++++------\n 1 file changed, 7 insertions(+), 6 deletions(-)", "diff": "diff --git a/migration/file.c b/migration/file.c\nindex 5618aced49..0853188601 100644\n--- a/migration/file.c\n+++ b/migration/file.c\n@@ -254,15 +254,16 @@ int file_write_ramblock_iov(QIOChannel *ioc, const struct iovec *iov,\n \n int multifd_file_recv_data(MultiFDRecvParams *p, Error **errp)\n {\n+ ERRP_GUARD();\n MultiFDRecvData *data = p->data;\n- size_t ret;\n+ int ret;\n \n- ret = qio_channel_pread(p->c, (char *) data->opaque,\n- data->size, data->file_offset, errp);\n- if (ret != data->size) {\n+ ret = qio_channel_pread_all(p->c, (char *) data->opaque,\n+ data->size, data->file_offset, errp);\n+ if (ret != 0) {\n error_prepend(errp,\n- \"multifd recv (%u): read 0x%zx, expected 0x%zx\",\n- p->id, ret, data->size);\n+ \"multifd recv (%u): \",\n+ p->id);\n return -1;\n }\n \n", "prefixes": [ "v3", "3/4" ] }