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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists1p.gnu.org; Received-SPF: pass client-ip=148.163.156.1; envelope-from=vaibhav@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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: qemu development 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 @ibm.com) X-ZM-MESSAGEID: 1778505072575154100 Content-Type: text/plain; charset="utf-8" GCC 16 tightens diagnostics around const correctness and now correctly rejects attempts to modify strings referenced through const-qualified pointers. In kvm_ppc_register_host_cpu_type(), ppc_cpu_aliases[i].model is defined as const char *, but the code was using strstr() on it and then modifying the returned pointer in-place to strip POWERPC_CPU_TYPE_SUFFIX. This results in a write through a pointer derived from const data, triggering a build failure with GCC 16: error: assignment discards 'const' qualifier from pointer target type [-W= error=3Ddiscarded-qualifiers] suffix =3D strstr(ppc_cpu_aliases[i].model, POWERPC_CPU_TYPE_SUFFIX= ); ^ Fix this by copying only the needed suffix from the object class-name to 'ppc_cpu_aliases.model' using g_strdup and g_strndup, which maintains the constness of the allocated buffer assigned to 'ppc_cpu_aliases.model' member of the 'ppc_cpu_aliases' struct array. The patch also adds error handling for possible memory allocation failure while calling g_str{n}dup functions so that the error is properly propogated back from kvm_arch_init(). Signed-off-by: Amit Machhiwal Signed-off-by: Vaibhav Jain (IBM) --- Change-log: v1->v2: https://lore.kernel.org/all/20260504134344.38958-1-amachhiw@linux.ibm.com * Avoid pointer aliasing * Handle memory allocation failure error --- target/ppc/kvm.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c index 25c28ad089..42cd4f4fff 100644 --- a/target/ppc/kvm.c +++ b/target/ppc/kvm.c @@ -170,9 +170,8 @@ int kvm_arch_init(MachineState *ms, KVMState *s) =20 cap_rpt_invalidate =3D kvm_vm_check_extension(s, KVM_CAP_PPC_RPT_INVAL= IDATE); cap_ail_mode_3 =3D kvm_vm_check_extension(s, KVM_CAP_PPC_AIL_MODE_3); - kvm_ppc_register_host_cpu_type(); =20 - return 0; + return kvm_ppc_register_host_cpu_type(); } =20 int kvm_arch_irqchip_create(KVMState *s) @@ -2654,14 +2653,17 @@ static int kvm_ppc_register_host_cpu_type(void) dc =3D DEVICE_CLASS(ppc_cpu_get_family_class(pvr_pcc)); for (i =3D 0; ppc_cpu_aliases[i].alias !=3D NULL; i++) { if (g_ascii_strcasecmp(ppc_cpu_aliases[i].alias, dc->desc) =3D=3D = 0) { - char *suffix; + const gchar *suffix, *cname =3D object_class_get_name(oc); + + suffix =3D g_strstr_len(cname, -1, POWERPC_CPU_TYPE_SUFFIX); + ppc_cpu_aliases[i].model =3D unlikely(suffix) ? + g_strndup(cname, suffix - cname) : g_strdup(cname); =20 - ppc_cpu_aliases[i].model =3D g_strdup(object_class_get_name(oc= )); - suffix =3D strstr(ppc_cpu_aliases[i].model, POWERPC_CPU_TYPE_S= UFFIX); - if (suffix) { - *suffix =3D 0; + if (!ppc_cpu_aliases[i].model) { + return -ENOMEM; + } else { + return 0; } - break; } } =20 --=20 2.54.0