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X-Received-From: 2a00:1450:4864:20::434 Subject: [Qemu-devel] [PULL 4/5] hw/i386/pc: Fix crash when hot-plugging nvdimm on older machine types X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Thomas Huth Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Thomas Huth QEMU currently crashes when you try to hot-plug an "nvdimm" device on older machine types: $ qemu-system-x86_64 -monitor stdio -M pc-1.1 QEMU 3.1.92 monitor - type 'help' for more information (qemu) device_add nvdimm,id=3Dnvdimmn1 qemu-system-x86_64: /home/thuth/devel/qemu/util/error.c:57: error_setv: Assertion `*errp =3D=3D ((void *)0)' failed. Aborted (core dumped) The call to hotplug_handler_pre_plug() in pc_memory_pre_plug() has been added recently before the check whether nvdimm is enabled. It should be done after the check. And while we're at it, also check the errp after the hotplug_handler_pre_plug(), otherwise errors are silently ignored here. Fixes: 9040e6dfa8c3fed87695a3de555d2c775727bb51 Signed-off-by: Thomas Huth Message-Id: <20190407092314.11066-1-thuth@redhat.com> Signed-off-by: Paolo Bonzini --- hw/i386/pc.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/hw/i386/pc.c b/hw/i386/pc.c index 6077d27..f2c15bf 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -2078,6 +2078,7 @@ static void pc_memory_pre_plug(HotplugHandler *hotplu= g_dev, DeviceState *dev, const MachineState *ms =3D MACHINE(hotplug_dev); const bool is_nvdimm =3D object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM); const uint64_t legacy_align =3D TARGET_PAGE_SIZE; + Error *local_err =3D NULL; =20 /* * When -no-acpi is used with Q35 machine type, no ACPI is built, @@ -2090,13 +2091,17 @@ static void pc_memory_pre_plug(HotplugHandler *hotp= lug_dev, DeviceState *dev, return; } =20 - hotplug_handler_pre_plug(pcms->acpi_dev, dev, errp); - if (is_nvdimm && !ms->nvdimms_state->is_enabled) { error_setg(errp, "nvdimm is not enabled: missing 'nvdimm' in '-M'"= ); return; } =20 + hotplug_handler_pre_plug(pcms->acpi_dev, dev, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + pc_dimm_pre_plug(PC_DIMM(dev), MACHINE(hotplug_dev), pcmc->enforce_aligned_dimm ? NULL : &legacy_align, er= rp); } --=20 1.8.3.1