netdev - Re: [PATCH 1/5] PCI/VPD: Add pci_read/write_vpd

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Date:   Wed, 13 Oct 2021 10:22:35 -0400
From:   Qian Cai <quic_qiancai@...cinc.com>
To:     Heiner Kallweit <hkallweit1@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        Raju Rangoju <rajur@...lsio.com>
CC:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH 1/5] PCI/VPD: Add pci_read/write_vpd_any()



On 10/12/2021 4:26 PM, Heiner Kallweit wrote:
> Thanks for the report! I could reproduce the issue, the following fixes
> it for me. Could you please test whether it fixes the issue for you as well?

Yes, it works fine. BTW, in the original patch here:

--- a/drivers/pci/vpd.c
+++ b/drivers/pci/vpd.c
@@ -138,9 +138,10 @@ static int pci_vpd_wait(struct pci_dev *dev, bool set)
 }
 
 static ssize_t pci_vpd_read(struct pci_dev *dev, loff_t pos, size_t count,
-			    void *arg)
+			    void *arg, bool check_size)
 {
 	struct pci_vpd *vpd = &dev->vpd;
+	unsigned int max_len = check_size ? vpd->len : PCI_VPD_MAX_SIZE;
 	int ret = 0;
 	loff_t end = pos + count;
 	u8 *buf = arg;
@@ -151,11 +152,11 @@ static ssize_t pci_vpd_read(struct pci_dev *dev, loff_t pos, size_t count,
 	if (pos < 0)
 		return -EINVAL;
 
-	if (pos > vpd->len)
+	if (pos >= max_len)
 		return 0;

I am not sure if "pos >= max_len" is correct there, so just want to give you
a chance to double-check.