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Wed, 18 Mar 2026 14:19:23 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Wed, 18 Mar 2026 16:19:22 -0500 Message-Id: Cc: , , , , , , , , , Subject: Re: [PATCH] RISC-V: KVM: Fix out-of-bounds by 1 From: "Ethan Tidmore" To: "Ethan Tidmore" , X-Mailer: aerc 0.21.0-0-g5549850facc2 References: <20260228152226.2116895-1-ethantidmore06@gmail.com> In-Reply-To: <20260228152226.2116895-1-ethantidmore06@gmail.com> On Sat Feb 28, 2026 at 9:22 AM CST, Ethan Tidmore wrote: > The array kvpmu->pmc is defined as: > > struct kvm_pmc pmc[RISCV_KVM_MAX_COUNTERS]; > > So, accessing it with index RISCV_KVM_MAX_COUNTERS would be > out-of-bounds by 1. > > Change index check from > to >=3D. > > Detected by Smatch: > arch/riscv/kvm/vcpu_pmu.c:528 kvm_riscv_vcpu_pmu_ctr_info() error: > buffer overflow 'kvpmu->pmc' 64 <=3D 64 > > Fixes: 8f0153ecd3bf1 ("RISC-V: KVM: Add skeleton support for perf") > Signed-off-by: Ethan Tidmore > --- Friendly ping. Thanks, ET