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Sat, 14 Dec 2019 09:46:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1576316777; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=XW33OjbNZfIzOzwZ5W3uHfwF9YmS9RFQ9HoMdM6KrBs=; b=SK1C6mBUrcY79XrFj7vP+U7CKTDqjQpOe9R7uTHAFazCL5vk6s1JdtszMx7EakR8z3Ov3l GNY2fYzojYknTULDTJhPwX8bAgwyDOlKnsk0ULao3OUySGu8nY7pWqw6Kor+1MwUV1PX6+ BCc4HjYsaFHYXc3fV2hDbE0odlEL1IA= From: Cornelia Huck To: Peter Maydell Subject: [PULL v2 12/16] s390x/cpumodel: Fix realize() error API violations Date: Sat, 14 Dec 2019 10:45:22 +0100 Message-Id: <20191214094526.8698-13-cohuck@redhat.com> In-Reply-To: <20191214094526.8698-1-cohuck@redhat.com> References: <20191214094526.8698-1-cohuck@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-MC-Unique: Qw9is9HYNYalBd3cbC-RKg-1 X-Mimecast-Spam-Score: 0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.81 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Cornelia Huck , qemu-s390x@nongnu.org, David Hildenbrand , qemu-devel@nongnu.org, Markus Armbruster Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" From: Markus Armbruster get_max_cpu_model() dereferences @errp when kvm_s390_get_host_cpu_model() fails, apply_cpu_model() dereferences it when kvm_s390_apply_cpu_model() fails, and s390_realize_cpu_model() dereferences it when get_max_cpu_model() or check_compatibility() fail. That's wrong; see the big comment in error.h. All three introduced in commit 80560137cf "s390x/cpumodel: check and apply the CPU model". No caller actually passes null. Fix anyway: splice in a local Error *err, and error_propagate(). Cc: David Hildenbrand Cc: Cornelia Huck Signed-off-by: Markus Armbruster Reviewed-by: David Hildenbrand Message-Id: <20191204093625.14836-14-armbru@redhat.com> Signed-off-by: Cornelia Huck --- target/s390x/cpu_models.c | 37 ++++++++++++++++++++++--------------- 1 file changed, 22 insertions(+), 15 deletions(-) diff --git a/target/s390x/cpu_models.c b/target/s390x/cpu_models.c index 6a29fd3ab113..c702e34a26b9 100644 --- a/target/s390x/cpu_models.c +++ b/target/s390x/cpu_models.c @@ -870,6 +870,7 @@ static void check_compatibility(const S390CPUModel *max= _model, =20 static S390CPUModel *get_max_cpu_model(Error **errp) { + Error *err =3D NULL; static S390CPUModel max_model; static bool cached; =20 @@ -878,22 +879,24 @@ static S390CPUModel *get_max_cpu_model(Error **errp) } =20 if (kvm_enabled()) { - kvm_s390_get_host_cpu_model(&max_model, errp); + kvm_s390_get_host_cpu_model(&max_model, &err); } else { max_model.def =3D s390_find_cpu_def(QEMU_MAX_CPU_TYPE, QEMU_MAX_CP= U_GEN, QEMU_MAX_CPU_EC_GA, NULL); bitmap_copy(max_model.features, qemu_max_cpu_feat, S390_FEAT_MAX); - } - if (!*errp) { - cached =3D true; - return &max_model; } - return NULL; + if (err) { + error_propagate(errp, err); + return NULL; + } + cached =3D true; + return &max_model; } =20 static inline void apply_cpu_model(const S390CPUModel *model, Error **errp) { #ifndef CONFIG_USER_ONLY + Error *err =3D NULL; static S390CPUModel applied_model; static bool applied; =20 @@ -909,20 +912,23 @@ static inline void apply_cpu_model(const S390CPUModel= *model, Error **errp) } =20 if (kvm_enabled()) { - kvm_s390_apply_cpu_model(model, errp); + kvm_s390_apply_cpu_model(model, &err); + if (err) { + error_propagate(errp, err); + return; + } } =20 - if (!*errp) { - applied =3D true; - if (model) { - applied_model =3D *model; - } + applied =3D true; + if (model) { + applied_model =3D *model; } #endif } =20 void s390_realize_cpu_model(CPUState *cs, Error **errp) { + Error *err =3D NULL; S390CPUClass *xcc =3D S390_CPU_GET_CLASS(cs); S390CPU *cpu =3D S390_CPU(cs); const S390CPUModel *max_model; @@ -939,7 +945,7 @@ void s390_realize_cpu_model(CPUState *cs, Error **errp) } =20 max_model =3D get_max_cpu_model(errp); - if (*errp) { + if (!max_model) { error_prepend(errp, "CPU models are not available: "); return; } @@ -951,8 +957,9 @@ void s390_realize_cpu_model(CPUState *cs, Error **errp) cpu->model->cpu_ver =3D max_model->cpu_ver; =20 check_consistency(cpu->model); - check_compatibility(max_model, cpu->model, errp); - if (*errp) { + check_compatibility(max_model, cpu->model, &err); + if (err) { + error_propagate(errp, err); return; } =20 --=20 2.21.0