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Tsirkin" , Igor Mammedov , Ani Sinha CC: , Markus Armbruster , Daniel Black , Subject: [PATCH 2/2] hmat acpi: Fix out of bounds access due to missing use of indirection Date: Thu, 29 Feb 2024 16:25:45 +0000 Message-ID: <20240229162545.7887-3-Jonathan.Cameron@huawei.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240229162545.7887-1-Jonathan.Cameron@huawei.com> References: <20240229162545.7887-1-Jonathan.Cameron@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.122.247.231] X-ClientProxiedBy: lhrpeml100001.china.huawei.com (7.191.160.183) To lhrpeml500005.china.huawei.com (7.191.163.240) 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=185.176.79.56; envelope-from=jonathan.cameron@huawei.com; helo=frasgout.his.huawei.com X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, 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: , Reply-to: Jonathan Cameron From: Jonathan Cameron via Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZM-MESSAGEID: 1709224044582100003 Content-Type: text/plain; charset="utf-8" With a numa set up such as -numa nodeid=3D0,cpus=3D0 \ -numa nodeid=3D1,memdev=3Dmem \ -numa nodeid=3D2,cpus=3D1 and appropriate hmat_lb entries the initiator list is correctly computed and writen to HMAT as 0,2 but then the LB data is accessed using the node id (here 2), landing outside the entry_list array. Stash the reverse lookup when writing the initiator list and use it to get the correct array index index. Fixes: 4586a2cb83 ("hmat acpi: Build System Locality Latency and Bandwidth = Information Structure(s)") Signed-off-by: Jonathan Cameron --- hw/acpi/hmat.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/hw/acpi/hmat.c b/hw/acpi/hmat.c index 723ae28d32..b933ae3c06 100644 --- a/hw/acpi/hmat.c +++ b/hw/acpi/hmat.c @@ -78,6 +78,7 @@ static void build_hmat_lb(GArray *table_data, HMAT_LB_Inf= o *hmat_lb, uint32_t *initiator_list) { int i, index; + uint32_t initiator_to_index[MAX_NODES] =3D {}; HMAT_LB_Data *lb_data; uint16_t *entry_list; uint32_t base; @@ -121,6 +122,8 @@ static void build_hmat_lb(GArray *table_data, HMAT_LB_I= nfo *hmat_lb, /* Initiator Proximity Domain List */ for (i =3D 0; i < num_initiator; i++) { build_append_int_noprefix(table_data, initiator_list[i], 4); + /* Reverse mapping for array possitions */ + initiator_to_index[initiator_list[i]] =3D i; } =20 /* Target Proximity Domain List */ @@ -132,7 +135,8 @@ static void build_hmat_lb(GArray *table_data, HMAT_LB_I= nfo *hmat_lb, entry_list =3D g_new0(uint16_t, num_initiator * num_target); for (i =3D 0; i < hmat_lb->list->len; i++) { lb_data =3D &g_array_index(hmat_lb->list, HMAT_LB_Data, i); - index =3D lb_data->initiator * num_target + lb_data->target; + index =3D initiator_to_index[lb_data->initiator] * num_target + + lb_data->target; =20 entry_list[index] =3D (uint16_t)(lb_data->data / hmat_lb->base); } --=20 2.39.2