Hi, all! Here is another potential NULL pointer dereference in kvm subsystem of linux stable vanilla 6.10, as GCC 12.3.0 complains. (Please don't throw stuff at me, I think this is the last one for today :-) arch/x86/include/asm/mshyperv.h ------------------------------- 242 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu) 243 { 244 if (!hv_vp_assist_page) 245 return NULL; 246 247 return hv_vp_assist_page[cpu]; 248 } arch/x86/kvm/vmx/vmx_onhyperv.h ------------------------------- 102 static inline void evmcs_load(u64 phys_addr) 103 { 104 struct hv_vp_assist_page *vp_ap = 105 hv_get_vp_assist_page(smp_processor_id()); 106 107 if (current_evmcs->hv_enlightenments_control.nested_flush_hypercall) 108 vp_ap->nested_control.features.directhypercall = 1; 109 vp_ap->current_nested_vmcs = phys_addr; 110 vp_ap->enlighten_vmentry = 1; 111 } Now, this one is simple: hv_vp_assist_page(cpu) can return NULL, and in line 104 it is assigned to wp_ap, which is dereferenced in lines 108, 109, and 110, which is not checked against returning NULL by hv_vp_assist_page(). Commits 50a82b0eb88c1 and a46d15cc1ae5a are related to the issue. Hope this helps. Best regards, Mirsad Todorovac