From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id D384740DFCE; Sun, 22 Mar 2026 13:54:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=114.242.206.163 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774187657; cv=none; b=cPoaPuz1okzrhhwJUhIsJeNS3pTavODtToQwMKS8Q0tJ4tdL+zar56U4Tv1t4zKM9gmgwoJuiXa7Zz5JHb7LfhlghGugG+U2PuYqyMLwlhLJGMJ8Qk1dRMBno4zloRuNBxvlkGDIiZYMRv7gmEVTdwhH/7wVZBUHaDAeC7nTRxo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774187657; c=relaxed/simple; bh=AfWL8r2fVLOSiaFfp1K/VGEB5sEJdcb/ggopn4COiRo=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=e4Epu5pTEkv0elh8e7Z7wjsuA3K6ZuVpTQW9qerLw37MxFLhldH/qjtYqSsrSmPVkN9PgSMj564hXjutpjrKEQgoPyuT/dm8JxCmswM1T8Qji/KqSemE6k2FTwJGbazb7Hc0tUZv3LyRMMs9/q0aUsMIm8DsflFOXfS43VTkiOo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn; spf=pass smtp.mailfrom=loongson.cn; arc=none smtp.client-ip=114.242.206.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=loongson.cn Received: from loongson.cn (unknown [223.64.68.17]) by gateway (Coremail) with SMTP id _____8AxQcB89L9piosdAA--.25814S3; Sun, 22 Mar 2026 21:54:04 +0800 (CST) Received: from kernelserver (unknown [223.64.68.17]) by front1 (Coremail) with SMTP id qMiowJAxIMNw9L9pDsVaAA--.39100S2; Sun, 22 Mar 2026 21:53:59 +0800 (CST) From: Huacai Chen To: Paolo Bonzini , Huacai Chen , Tianrui Zhao , Bibo Mao Cc: kvm@vger.kernel.org, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, Xuerui Wang , Jiaxun Yang , Huacai Chen , stable@vger.kernel.org, Aurelien Jarno Subject: [PATCH 1/2] LoongArch: KVM: Make kvm_get_vcpu_by_cpuid() more robust Date: Sun, 22 Mar 2026 21:53:45 +0800 Message-ID: <20260322135346.3720577-1-chenhuacai@loongson.cn> X-Mailer: git-send-email 2.52.0 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:qMiowJAxIMNw9L9pDsVaAA--.39100S2 X-CM-SenderInfo: hfkh0x5xdftxo6or00hjvr0hdfq/ X-Coremail-Antispam: 1Uk129KBj9xXoWrtw15uw4kAryfuF1DZFyUXFc_yoWDZrc_Gw 1fta4YgrZ7CF10qr4q9ayfGF13J3yrAF4a9rZav343CasrJr1DW39Igw15ZryIgrW8CFs8 Aa1qy3sxC342yosvyTuYvTs0mTUanT9S1TB71UUUUj7qnTZGkaVYY2UrUUUUj1kv1TuYvT s0mT0YCTnIWjqI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUI cSsGvfJTRUUUbfxYFVCjjxCrM7AC8VAFwI0_Jr0_Gr1l1xkIjI8I6I8E6xAIw20EY4v20x vaj40_Wr0E3s1l1IIY67AEw4v_Jrv_JF1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxS w2x7M28EF7xvwVC0I7IYx2IY67AKxVWUJVWUCwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxV WUJVW8JwA2z4x0Y4vEx4A2jsIE14v26r4j6F4UM28EF7xvwVC2z280aVCY1x0267AKxVW8 JVW8Jr1ln4kS14v26r126r1DM2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6xkI12xvs2 x26I8E6xACxx1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r126r1D McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr4 1lc7CjxVAaw2AFwI0_JF0_Jw1l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_ Gr1l4IxYO2xFxVAFwI0_JF0_Jw1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67 AKxVWUGVWUWwC2zVAF1VAY17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8I cVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r1j6r4UMIIF0xvE42xK8VAvwI 8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v2 6r1j6r4UYxBIdaVFxhVjvjDU0xZFpf9x07j5o7tUUUUU= kvm_get_vcpu_by_cpuid() takes a cpuid parameter whose type is int, so cpuid can be negative. Let kvm_get_vcpu_by_cpuid() return NULL for this case so as to make it more robust. This fix an out-of-bounds access to kvm_arch::phyid_map::phys_map[]. Cc: Fixes: 73516e9da512adc ("LoongArch: KVM: Add vcpu mapping from physical cpuid") Reported-by: Aurelien Jarno Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1131431 Signed-off-by: Huacai Chen --- arch/loongarch/kvm/vcpu.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c index 8ffd50a470e6..831f381a8fd1 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -588,6 +588,9 @@ struct kvm_vcpu *kvm_get_vcpu_by_cpuid(struct kvm *kvm, int cpuid) { struct kvm_phyid_map *map; + if (cpuid < 0) + return NULL; + if (cpuid >= KVM_MAX_PHYID) return NULL; -- 2.52.0