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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 3/3] virt/kvm: copy userspace-array safely Date: Thu, 2 Nov 2023 19:15:26 +0100 Message-ID: <20231102181526.43279-4-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> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 kvm_main.c utilizes vmemdup_user() and array_size() to copy a userspace array. Currently, this does not check for an overflow. Use the new wrapper vmemdup_array_user() to copy the array more safely. Suggested-by: Dave Airlie Signed-off-by: Philipp Stanner --- virt/kvm/kvm_main.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 486800a7024b..2a2f409c2a7d 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -4932,9 +4932,8 @@ static long kvm_vm_ioctl(struct file *filp, goto out; if (routing.nr) { urouting = argp; - entries = vmemdup_user(urouting->entries, - array_size(sizeof(*entries), - routing.nr)); + entries = vmemdup_array_user(urouting->entries, + routing.nr, sizeof(*entries)); if (IS_ERR(entries)) { r = PTR_ERR(entries); goto out;