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bh=K7qNnSKJxOZantk4zTpYBHMaq49b+c+NbuYszzcGHU4=; b=dNFMm4BPLATDWSvqEPSANULwBFiaCi45RGb7w+sDee1C+qpf12Vy2TSjbCeMgU7gjsUOh4 yCXNXvTyz7cdUAoFt/7SCj9/DEqckzaopr0BM0BTzJ6EMuGJjdaU5Qzaz6psQkNygo9DNW gGIZ5Kh2oP7wJC9GoPbnTBstSRHrpgs= X-MC-Unique: xIWxVDC1MwK_mUWKLw-x9A-1 From: Kevin Wolf To: qemu-devel@nongnu.org Cc: kwolf@redhat.com, thuth@redhat.com, armbru@redhat.com, philmd@linaro.org, peter.maydell@linaro.org Subject: [PATCH for-8.2 1/2] qdev: Fix crash in array property getter Date: Tue, 21 Nov 2023 18:34:15 +0100 Message-ID: <20231121173416.346610-2-kwolf@redhat.com> In-Reply-To: <20231121173416.346610-1-kwolf@redhat.com> References: <20231121173416.346610-1-kwolf@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.7 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=kwolf@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_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1700588120517100002 Content-Type: text/plain; charset="utf-8" Passing an uninitialised list to visit_start_list() happens to work for the QObject output visitor because it treats the pointer as an opaque value and never dereferences it, but the string output visitor expects a valid list to check if it has more than one element. The existing code crashes with the string output visitor if the uninitialised value is non-NULL. Passing an explicit NULL would fix the crash, but still result in wrong output. Rework get_prop_array() so that it conforms to the expectations that the string output visitor has. This includes building a real list first and using visit_next_list() to iterate it. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1993 Reported-by: Thomas Huth Signed-off-by: Kevin Wolf Tested-by: Dan Hoffman --- hw/core/qdev-properties.c | 33 ++++++++++++++++++++++++++------- 1 file changed, 26 insertions(+), 7 deletions(-) diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c index 91632f7be9..840006e953 100644 --- a/hw/core/qdev-properties.c +++ b/hw/core/qdev-properties.c @@ -689,23 +689,36 @@ static void get_prop_array(Object *obj, Visitor *v, c= onst char *name, Property *prop =3D opaque; uint32_t *alenptr =3D object_field_prop_ptr(obj, prop); void **arrayptr =3D (void *)obj + prop->arrayoffset; - char *elem =3D *arrayptr; - GenericList *list; - const size_t list_elem_size =3D sizeof(*list) + prop->arrayfieldsize; + char *elemptr =3D *arrayptr; + ArrayElementList *list =3D NULL, *elem; + ArrayElementList **tail =3D &list; + const size_t size =3D sizeof(*list); int i; bool ok; =20 - if (!visit_start_list(v, name, &list, list_elem_size, errp)) { + /* At least the string output visitor needs a real list */ + for (i =3D 0; i < *alenptr; i++) { + elem =3D g_new0(ArrayElementList, 1); + elem->value =3D elemptr; + elemptr +=3D prop->arrayfieldsize; + + *tail =3D elem; + tail =3D &elem->next; + } + + if (!visit_start_list(v, name, (GenericList **) &list, size, errp)) { return; } =20 - for (i =3D 0; i < *alenptr; i++) { - Property elem_prop =3D array_elem_prop(obj, prop, name, elem); + elem =3D list; + while (elem) { + Property elem_prop =3D array_elem_prop(obj, prop, name, elem->valu= e); prop->arrayinfo->get(obj, v, NULL, &elem_prop, errp); if (*errp) { goto out_obj; } - elem +=3D prop->arrayfieldsize; + elem =3D (ArrayElementList *) visit_next_list(v, (GenericList*) el= em, + size); } =20 /* visit_check_list() can only fail for input visitors */ @@ -714,6 +727,12 @@ static void get_prop_array(Object *obj, Visitor *v, co= nst char *name, =20 out_obj: visit_end_list(v, (void**) &list); + + while (list) { + elem =3D list; + list =3D elem->next; + g_free(elem); + } } =20 static void default_prop_array(ObjectProperty *op, const Property *prop) --=20 2.42.0