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From:   Kangjie Lu <kjlu@umn.edu>
To:     kjlu@umn.edu
Cc:     pakki001@umn.edu, "David S. Miller" <davem@davemloft.net>,
        Shannon Nelson <shannon.nelson@oracle.com>,
        Colin Ian King <colin.king@canonical.com>,
        Rob Taglang <rob@taglang.io>, Joe Perches <joe@perches.com>,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] ethernet: (niu) fix missing checks of niu_pci_eeprom_read
Date:   Tue, 25 Dec 2018 01:56:14 -0600
Message-Id: <20181225075617.68058-1-kjlu@umn.edu>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

niu_pci_eeprom_read() may fail, so we should check its return value
before using the read data.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
---
 drivers/net/ethernet/sun/niu.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/sun/niu.c b/drivers/net/ethernet/sun/niu.c
index 9319d84bf49f..d84501441edd 100644
--- a/drivers/net/ethernet/sun/niu.c
+++ b/drivers/net/ethernet/sun/niu.c
@@ -8100,6 +8100,8 @@ 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;
@@ -8144,8 +8146,12 @@ 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++)
-				*prop_buf++ = niu_pci_eeprom_read(np, off + i);
+			for (i = 0; i < prop_len; i++) {
+				err = niu_pci_eeprom_read(np, off + i);
+				if (err >= 0)
+					*prop_buf = err;
+				++prop_buf;
+			}
 		}
 
 		start += len;
-- 
2.17.2 (Apple Git-113)