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Fri, 24 Oct 2025 13:40:13 +0000 (UTC) Received: from blackfin.pond.sub.org (unknown [10.45.242.24]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 0AB7219560B5; Fri, 24 Oct 2025 13:40:12 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id 4167521E6A27; Fri, 24 Oct 2025 15:40:10 +0200 (CEST) From: Markus Armbruster To: Bin Guo Cc: farosas@suse.de, peterx@redhat.com, qemu-devel@nongnu.org, berrange@redhat.com Subject: Re: [PATCH] migration: Don't free the reason after calling migrate_add_blocker In-Reply-To: <20251024115305.1424-1-guobin@linux.alibaba.com> (Bin Guo's message of "Fri, 24 Oct 2025 19:53:05 +0800") References: <87o6pw1rfn.fsf@pond.sub.org> <20251024115305.1424-1-guobin@linux.alibaba.com> Date: Fri, 24 Oct 2025 15:40:10 +0200 Message-ID: <878qh0zadh.fsf@pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass client-ip=170.10.129.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.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, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_PASS=-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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Bin Guo writes: > Markus Armbruster writes: > >> > Signed-off-by: Bin Guo >> > --- >> > hw/intc/arm_gicv3_kvm.c | 1 - >> > target/i386/sev.c | 1 - >> > 2 files changed, 2 deletions(-) >> > >> > diff --git a/hw/intc/arm_gicv3_kvm.c b/hw/intc/arm_gicv3_kvm.c >> > index 66b0dddfd4..6f311e37ef 100644 >> > --- a/hw/intc/arm_gicv3_kvm.c >> > +++ b/hw/intc/arm_gicv3_kvm.c >> > @@ -841,7 +841,6 @@ static void kvm_arm_gicv3_realize(DeviceState *dev, Error **errp) >> > error_setg(&kvm_nv_migration_blocker, >> > "Live migration disabled because KVM nested virt is enabled"); >> > if (migrate_add_blocker(&kvm_nv_migration_blocker, errp)) { >> > - error_free(kvm_nv_migration_blocker); >> > return; >> > } >> > >> > diff --git a/target/i386/sev.c b/target/i386/sev.c >> > index 1057b8ab2c..fd2dada013 100644 >> > --- a/target/i386/sev.c >> > +++ b/target/i386/sev.c >> > @@ -1661,7 +1661,6 @@ sev_snp_launch_finish(SevCommonState *sev_common) >> > ret = migrate_add_blocker(&sev_mig_blocker, &local_err); >> > if (local_err) { >> > error_report_err(local_err); >> > - error_free(sev_mig_blocker); >> > exit(1); >> > } >> > } >> >> Does this fix use-after-free bugs? > > No, just delete the unnecessary code and follow the best practice. > Function migrate_add_blocker will free the reason and set it to NULL > if failure is returned. Please work the second sentence into the commit message.