[{"id":3683458,"web_url":"http://patchwork.ozlabs.org/comment/3683458/","msgid":"","list_archive_url":null,"date":"2026-04-28T13:29:28","subject":"Re: [PATCH 1/2] qom: improve use-after-free debugging","submitter":{"id":6442,"url":"http://patchwork.ozlabs.org/api/people/6442/","name":"Marc-André Lureau","email":"marcandre.lureau@gmail.com"},"content":"Hi\n\nOn Mon, Apr 27, 2026 at 7:49 PM Roman Kiryanov wrote:\n>\n> This patch invalidates dead objects so their usage will\n> lead to more predictable results (crashes or asserts).\n>\n> Change-Id: I1dc36dbc1030c2e41c937f08baa97b2e81d44c82\n> Signed-off-by: Roman Kiryanov \n> ---\n> qom/object.c | 3 +++\n> 1 file changed, 3 insertions(+)\n>\n> diff --git a/qom/object.c b/qom/object.c\n> index f981e27044..240e36c39e 100644\n> --- a/qom/object.c\n> +++ b/qom/object.c\n> @@ -613,6 +613,7 @@ static void object_property_del_all(Object *obj)\n> } while (released);\n>\n> g_hash_table_unref(obj->properties);\n> + obj->properties = NULL;\n\nThat makes sense (I'd g_clear_pointer for a safer one-liner instead)\n\n> }\n>\n> static void object_property_del_child(Object *obj, Object *child)\n> @@ -670,6 +671,8 @@ static void object_finalize(void *data)\n>\n> g_assert(obj->ref == 0);\n> g_assert(obj->parent == NULL);\n> + g_assert(obj->properties == NULL);\n> + obj->class = NULL;\n\nThis one I am not sure is placed right. If the goal is to revert the\nobject_initialize_with_type() effect, perhaps it should do more, in\nobject_deinit() ?\n\n> if (obj->free) {\n> obj->free(obj);\n> }\n> --\n> 2.54.0.rc2.544.gc7ae2d5bb8-goog\n>\n>","headers":{"Return-Path":"","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=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=n4QD81ep;\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 4g4hC46vfjz1yHv\n\tfor ; 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Tue, 28 Apr 2026\n 06:29:40 -0700 (PDT)","MIME-Version":"1.0","References":"<20260427154441.1918536-1-rkir@google.com>\n <20260427154441.1918536-2-rkir@google.com>","In-Reply-To":"<20260427154441.1918536-2-rkir@google.com>","From":"=?utf-8?q?Marc-Andr=C3=A9_Lureau?= ","Date":"Tue, 28 Apr 2026 17:29:28 +0400","X-Gm-Features":"AVHnY4Ku_OSO9hPHyBj08MfQfOQyRmCpZnF_KX-Gbewxxo3v-3TqdUu1R3Lgg3M","Message-ID":"\n ","Subject":"Re: [PATCH 1/2] qom: improve use-after-free debugging","To":"Roman Kiryanov ","Cc":"pbonzini@redhat.com, alex.bennee@linaro.org, qemu-devel@nongnu.org","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable","Received-SPF":"pass client-ip=2607:f8b0:4864:20::1231;\n envelope-from=marcandre.lureau@gmail.com; helo=mail-dl1-x1231.google.com","X-Spam_score_int":"-20","X-Spam_score":"-2.1","X-Spam_bar":"--","X-Spam_report":"(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n 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 ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}},{"id":3683550,"web_url":"http://patchwork.ozlabs.org/comment/3683550/","msgid":"","list_archive_url":null,"date":"2026-04-28T15:52:17","subject":"Re: [PATCH 1/2] qom: improve use-after-free debugging","submitter":{"id":78520,"url":"http://patchwork.ozlabs.org/api/people/78520/","name":"Roman Kiryanov","email":"rkir@google.com"},"content":"Hi Marc, thank you for looking.\n\nOn Tue, Apr 28, 2026 at 6:29 AM Marc-André Lureau\n wrote:\n> This one I am not sure is placed right. If the goal is to revert the\n> object_initialize_with_type() effect, perhaps it should do more, in\n> object_deinit() ?\n\nI agree, I will send an update.","headers":{"Return-Path":"","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=google.com header.i=@google.com header.a=rsa-sha256\n header.s=20251104 header.b=LRfK3n3c;\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 4g4lMk0sMhz1xrS\n\tfor ; Wed, 29 Apr 2026 01:53:20 +1000 (AEST)","from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists1p.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from )\n\tid 1wHkjo-0000sJ-R1; 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