patch "Revert "niu: fix missing checks of niu_pci_eeprom_read"" added to char-misc-linus

This is a note to let you know that I've just added the patch titled

Revert "niu: fix missing checks of niu_pci_eeprom_read"

to my char-misc git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 7930742d6a0ff091c85b92ef4e076432d8d8cb79 Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <[email protected]>
Date: Mon, 3 May 2021 13:56:49 +0200
Subject: Revert "niu: fix missing checks of niu_pci_eeprom_read"

This reverts commit 26fd962bde0b15e54234fe762d86bc0349df1de4.

Because of recent interactions with developers from @umn.edu, all commits from them have been recently re-reviewed to ensure if they were correct or not.

Upon review, this commit was found to be incorrect for the reasons below, so it must be reverted. It will be fixed up "correctly" in a later kernel change.

The change here was incorrect. While it is nice to check if niu_pci_eeprom_read() succeeded or not when using the data, any error that might have happened was not propagated upwards properly, causing the kernel to assume that these reads were successful, which results in invalid data in the buffer that was to contain the successfully read data.

---
 drivers/net/ethernet/sun/niu.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

index 707ccdd03b19..d70cdea756d1 100644
@@ -8097,8 +8097,6 @@ static int niu_pci_vpd_scan_props(struct niu *np, u32 start, u32 end)
 		start += 3;
 
 		prop_len = niu_pci_eeprom_read(np, start + 4);
-		if (prop_len < 0)
-			return prop_len;
 		err = niu_pci_vpd_get_propname(np, start + 5, namebuf, 64);
 		if (err < 0)
 			return err;

@@ -8143,12 +8141,8 @@ static int niu_pci_vpd_scan_props(struct niu *np, u32 start, u32 end)
 			netif_printk(np, probe, KERN_DEBUG, np->dev,
 				     "VPD_SCAN: Reading in property [%s] len[%d]\n",
 				     namebuf, prop_len);
-			for (i = 0; i < prop_len; i++) {
-				err = niu_pci_eeprom_read(np, off + i);
-				if (err >= 0)
-					*prop_buf = err;
-				++prop_buf;
-			}
+			for (i = 0; i < prop_len; i++)
+				*prop_buf++ = niu_pci_eeprom_read(np, off + i);
 		}
 
 		start += len;

2.31.1