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[142.68.80.239]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7a9a7a283adsm533918285a.129.2024.09.12.06.12.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Sep 2024 06:12:00 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.95) (envelope-from ) id 1sojc7-00CzIH-H0; Thu, 12 Sep 2024 10:11:59 -0300 Date: Thu, 12 Sep 2024 10:11:59 -0300 From: Jason Gunthorpe To: Dan Carpenter Cc: Alex Williamson , Kevin Tian , Yi Liu , Christian Brauner , Kunwu Chan , Ankit Agrawal , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: Re: [PATCH] vfio/pci: clean up a type in vfio_pci_ioctl_pci_hot_reset_groups() Message-ID: <20240912131159.GC1304783@ziepe.ca> References: <262ada03-d848-4369-9c37-81edeeed2da2@stanley.mountain> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <262ada03-d848-4369-9c37-81edeeed2da2@stanley.mountain> On Thu, Sep 12, 2024 at 11:49:10AM +0300, Dan Carpenter wrote: > The "array_count" value comes from the copy_from_user() in > vfio_pci_ioctl_pci_hot_reset(). If the user passes a value larger than > INT_MAX then we'll pass a negative value to kcalloc() which triggers an > allocation failure and a stack trace. > > It's better to make the type unsigned so that if (array_count > count) > returns -EINVAL instead. > > Signed-off-by: Dan Carpenter > --- > drivers/vfio/pci/vfio_pci_core.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) Reviewed-by: Jason Gunthorpe Jason