From: Huacai Chen Date: Thu, 26 Mar 2026 06:29:09 +0000 (+0800) Subject: LoongArch: KVM: Handle the case that EIOINTC's coremap is empty X-Git-Tag: v7.0-rc6~26^2~1 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=b97bd69eb0f67b5f961b304d28e9ba45e202d841;p=thirdparty%2Fkernel%2Flinux.git LoongArch: KVM: Handle the case that EIOINTC's coremap is empty EIOINTC's coremap in eiointc_update_sw_coremap() can be empty, currently we get a cpuid with -1 in this case, but we actually need 0 because it's similar as the case that cpuid >= 4. This fix an out-of-bounds access to kvm_arch::phyid_map::phys_map[]. Cc: Fixes: 3956a52bc05bd81 ("LoongArch: KVM: Add EIOINTC read and write functions") Reported-by: Aurelien Jarno Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1131431 Signed-off-by: Huacai Chen --- diff --git a/arch/loongarch/kvm/intc/eiointc.c b/arch/loongarch/kvm/intc/eiointc.c index d2acb4d09e73..c7badc813923 100644 --- a/arch/loongarch/kvm/intc/eiointc.c +++ b/arch/loongarch/kvm/intc/eiointc.c @@ -83,7 +83,7 @@ static inline void eiointc_update_sw_coremap(struct loongarch_eiointc *s, if (!(s->status & BIT(EIOINTC_ENABLE_CPU_ENCODE))) { cpuid = ffs(cpuid) - 1; - cpuid = (cpuid >= 4) ? 0 : cpuid; + cpuid = ((cpuid < 0) || (cpuid >= 4)) ? 0 : cpuid; } vcpu = kvm_get_vcpu_by_cpuid(s->kvm, cpuid);