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Peter Anvin" Cc: kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org, Philipp Stanner , Dave Airlie Subject: [PATCH 2/3] arch/s390/kvm: copy userspace-array safely Date: Thu, 2 Nov 2023 19:15:25 +0100 Message-ID: <20231102181526.43279-3-pstanner@redhat.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231102181526.43279-1-pstanner@redhat.com> References: <20231102181526.43279-1-pstanner@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" guestdbg.c utilizes memdup_user() to copy a userspace array. This, currently, does not check for an overflow. Use the new wrapper memdup_array_user() to copy the array more safely. Suggested-by: Dave Airlie Signed-off-by: Philipp Stanner Acked-by: Claudio Imbrenda --- arch/s390/kvm/guestdbg.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/s390/kvm/guestdbg.c b/arch/s390/kvm/guestdbg.c index 3765c4223bf9..80879fc73c90 100644 --- a/arch/s390/kvm/guestdbg.c +++ b/arch/s390/kvm/guestdbg.c @@ -213,8 +213,8 @@ int kvm_s390_import_bp_data(struct kvm_vcpu *vcpu, else if (dbg->arch.nr_hw_bp > MAX_BP_COUNT) return -EINVAL; =20 - bp_data =3D memdup_user(dbg->arch.hw_bp, - sizeof(*bp_data) * dbg->arch.nr_hw_bp); + bp_data =3D memdup_array_user(dbg->arch.hw_bp, dbg->arch.nr_hw_bp, + sizeof(*bp_data)); if (IS_ERR(bp_data)) return PTR_ERR(bp_data); =20 --=20 2.41.0