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[22/69] Revert "niu: fix missing checks of niu_pci_eeprom_read"

Message ID 20210503115736.2104747-23-gregkh@linuxfoundation.org
State Accepted
Commit 7930742d6a0ff091c85b92ef4e076432d8d8cb79
Headers show
Series None | expand

Commit Message

Greg KH May 3, 2021, 11:56 a.m. UTC
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.

Cc: Kangjie Lu <kjlu@umn.edu>
Cc: Shannon Nelson <shannon.lee.nelson@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Fixes: 26fd962bde0b ("niu: fix missing checks of niu_pci_eeprom_read")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/sun/niu.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/sun/niu.c b/drivers/net/ethernet/sun/niu.c
index 707ccdd03b19..d70cdea756d1 100644
--- a/drivers/net/ethernet/sun/niu.c
+++ b/drivers/net/ethernet/sun/niu.c
@@ -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;