From patchwork Wed Apr 10 07:22:49 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Michael Tokarev X-Patchwork-Id: 1921784 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=patchwork.ozlabs.org) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4VDvgC0MQmz1yYM for ; Wed, 10 Apr 2024 17:32:39 +1000 (AEST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ruSPw-0003el-Pg; Wed, 10 Apr 2024 03:30:49 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ruSPc-00030a-QR; Wed, 10 Apr 2024 03:30:30 -0400 Received: from isrv.corpit.ru ([86.62.121.231]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ruSPa-0005Mi-F7; Wed, 10 Apr 2024 03:30:28 -0400 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id 0D2895D6BC; Wed, 10 Apr 2024 10:25:08 +0300 (MSK) Received: from tls.msk.ru (mjt.wg.tls.msk.ru [192.168.177.130]) by tsrv.corpit.ru (Postfix) with SMTP id A5937B02FC; Wed, 10 Apr 2024 10:23:09 +0300 (MSK) Received: (nullmailer pid 4191879 invoked by uid 1000); Wed, 10 Apr 2024 07:23:04 -0000 From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, Avihai Horon , =?utf-8?q?C?= =?utf-8?q?=C3=A9dric_Le_Goater?= , Peter Xu , Michael Tokarev Subject: [Stable-8.2.3 76/87] migration/postcopy: Ensure postcopy_start() sets errp if it fails Date: Wed, 10 Apr 2024 10:22:49 +0300 Message-Id: <20240410072303.4191455-76-mjt@tls.msk.ru> X-Mailer: git-send-email 2.39.2 In-Reply-To: References: MIME-Version: 1.0 Received-SPF: pass client-ip=86.62.121.231; envelope-from=mjt@tls.msk.ru; helo=isrv.corpit.ru X-Spam_score_int: -68 X-Spam_score: -6.9 X-Spam_bar: ------ X-Spam_report: (-6.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, 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: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Avihai Horon There are several places where postcopy_start() fails without setting errp. This can cause a null pointer de-reference, as in case of error, the caller of postcopy_start() copies/prints the error set in errp. Fix it by setting errp in all of postcopy_start() error paths. Cc: qemu-stable Fixes: 908927db28ea ("migration: Update error description whenever migration fails") Signed-off-by: Avihai Horon Reviewed-by: Cédric Le Goater Reviewed-by: Peter Xu Link: https://lore.kernel.org/r/20240328140252.16756-3-avihaih@nvidia.com Signed-off-by: Peter Xu (cherry picked from commit d0ad271a7613459bd0a3397c8071a4ad06f3f7eb) Signed-off-by: Michael Tokarev diff --git a/migration/migration.c b/migration/migration.c index 982ab85f04..dbc6c3947c 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -2408,6 +2408,8 @@ static int postcopy_start(MigrationState *ms, Error **errp) migration_wait_main_channel(ms); if (postcopy_preempt_establish_channel(ms)) { migrate_set_state(&ms->state, ms->state, MIGRATION_STATUS_FAILED); + error_setg(errp, "%s: Failed to establish preempt channel", + __func__); return -1; } } @@ -2427,17 +2429,22 @@ static int postcopy_start(MigrationState *ms, Error **errp) global_state_store(); ret = migration_stop_vm(RUN_STATE_FINISH_MIGRATE); if (ret < 0) { + error_setg_errno(errp, -ret, "%s: Failed to stop the VM", __func__); goto fail; } ret = migration_maybe_pause(ms, &cur_state, MIGRATION_STATUS_POSTCOPY_ACTIVE); if (ret < 0) { + error_setg_errno(errp, -ret, "%s: Failed in migration_maybe_pause()", + __func__); goto fail; } ret = bdrv_inactivate_all(); if (ret < 0) { + error_setg_errno(errp, -ret, "%s: Failed in bdrv_inactivate_all()", + __func__); goto fail; } restart_block = true; @@ -2514,6 +2521,7 @@ static int postcopy_start(MigrationState *ms, Error **errp) /* Now send that blob */ if (qemu_savevm_send_packaged(ms->to_dst_file, bioc->data, bioc->usage)) { + error_setg(errp, "%s: Failed to send packaged data", __func__); goto fail_closefb; } qemu_fclose(fb);