From: Cornelia Huck <cohuck@redhat.com>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: Cornelia Huck <cohuck@redhat.com>,
qemu-s390x@nongnu.org, David Hildenbrand <david@redhat.com>,
qemu-devel@nongnu.org, Markus Armbruster <armbru@redhat.com>
Subject: [PULL 12/16] s390x/cpumodel: Fix realize() error API violations
Date: Fri, 13 Dec 2019 17:18:47 +0100 [thread overview]
Message-ID: <20191213161851.24687-13-cohuck@redhat.com> (raw)
In-Reply-To: <20191213161851.24687-1-cohuck@redhat.com>
From: Markus Armbruster <armbru@redhat.com>
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 <david@redhat.com>
Cc: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Message-Id: <20191204093625.14836-14-armbru@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
---
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,
static S390CPUModel *get_max_cpu_model(Error **errp)
{
+ Error *err = NULL;
static S390CPUModel max_model;
static bool cached;
@@ -878,22 +879,24 @@ static S390CPUModel *get_max_cpu_model(Error **errp)
}
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 = s390_find_cpu_def(QEMU_MAX_CPU_TYPE, QEMU_MAX_CPU_GEN,
QEMU_MAX_CPU_EC_GA, NULL);
bitmap_copy(max_model.features, qemu_max_cpu_feat, S390_FEAT_MAX);
- }
- if (!*errp) {
- cached = true;
- return &max_model;
}
- return NULL;
+ if (err) {
+ error_propagate(errp, err);
+ return NULL;
+ }
+ cached = true;
+ return &max_model;
}
static inline void apply_cpu_model(const S390CPUModel *model, Error **errp)
{
#ifndef CONFIG_USER_ONLY
+ Error *err = NULL;
static S390CPUModel applied_model;
static bool applied;
@@ -909,20 +912,23 @@ static inline void apply_cpu_model(const S390CPUModel *model, Error **errp)
}
if (kvm_enabled()) {
- kvm_s390_apply_cpu_model(model, errp);
+ kvm_s390_apply_cpu_model(model, &err);
+ if (err) {
+ error_propagate(errp, err);
+ return;
+ }
}
- if (!*errp) {
- applied = true;
- if (model) {
- applied_model = *model;
- }
+ applied = true;
+ if (model) {
+ applied_model = *model;
}
#endif
}
void s390_realize_cpu_model(CPUState *cs, Error **errp)
{
+ Error *err = NULL;
S390CPUClass *xcc = S390_CPU_GET_CLASS(cs);
S390CPU *cpu = S390_CPU(cs);
const S390CPUModel *max_model;
@@ -939,7 +945,7 @@ void s390_realize_cpu_model(CPUState *cs, Error **errp)
}
max_model = 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 = max_model->cpu_ver;
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;
}
--
2.21.0
next prev parent reply other threads:[~2019-12-13 21:27 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-13 16:18 [PULL 00/16] first s390x update for 5.0 Cornelia Huck
2019-12-13 16:18 ` [PULL 01/16] vfio-ccw: Fix error message Cornelia Huck
2019-12-13 16:18 ` [PULL 02/16] hw: add compat machines for 5.0 Cornelia Huck
2019-12-13 16:18 ` [PULL 03/16] s390x: Don't do a normal reset on the initial cpu Cornelia Huck
2019-12-13 16:18 ` [PULL 04/16] s390x: Move reset normal to shared reset handler Cornelia Huck
2019-12-13 16:18 ` [PULL 05/16] s390x: Move initial reset Cornelia Huck
2019-12-13 16:18 ` [PULL 06/16] s390x: Move clear reset Cornelia Huck
2019-12-13 16:18 ` [PULL 07/16] s390x: Beautify diag308 handling Cornelia Huck
2019-12-13 16:18 ` [PULL 08/16] s390x: kvm: Make kvm_sclp_service_call void Cornelia Huck
2019-12-13 16:18 ` [PULL 09/16] s390x: Fix cpu normal reset ri clearing Cornelia Huck
2019-12-13 16:18 ` [PULL 10/16] s390x/event-facility: Fix realize() error API violations Cornelia Huck
2019-12-13 16:18 ` [PULL 11/16] s390x/cpumodel: Fix feature property " Cornelia Huck
2019-12-13 16:18 ` Cornelia Huck [this message]
2019-12-13 16:18 ` [PULL 13/16] s390x/cpumodel: Fix query-cpu-model-FOO " Cornelia Huck
2019-12-13 16:18 ` [PULL 14/16] s390x/cpumodel: Fix query-cpu-definitions " Cornelia Huck
2019-12-13 16:18 ` [PULL 15/16] s390x/tcg: clear local interrupts on reset normal Cornelia Huck
2019-12-13 16:18 ` [PULL 16/16] qga: fence guest-set-time if hwclock not available Cornelia Huck
2019-12-13 21:12 ` [PULL 00/16] first s390x update for 5.0 Peter Maydell
2019-12-14 9:30 ` Cornelia Huck
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