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authorHeiner Kallweit <hkallweit1@gmail.com>2021-09-13 21:58:26 +0200
committerDavid S. Miller <davem@davemloft.net>2021-09-14 14:26:47 +0100
commitb9bbc4c1debc837ba56872fb3b2499ba6459ca8b (patch)
tree51388f433d655fbd5996d4b2a550f305cd144300 /net/ethtool
parent0f440524b69787ec2a843bc474a786beabc0bfa9 (diff)
ethtool: prevent endless loop if eeprom size is smaller than announced
It shouldn't happen, but can happen that readable eeprom size is smaller than announced. Then we would be stuck in an endless loop here because after reaching the actual end reads return eeprom.len = 0. I faced this issue when making a mistake in driver development. Detect this scenario and return an error. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ethtool')
-rw-r--r--net/ethtool/ioctl.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index f2abc3152888..999e2a6bed13 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -1537,6 +1537,10 @@ static int ethtool_get_any_eeprom(struct net_device *dev, void __user *useraddr,
ret = getter(dev, &eeprom, data);
if (ret)
break;
+ if (!eeprom.len) {
+ ret = -EIO;
+ break;
+ }
if (copy_to_user(userbuf, data, eeprom.len)) {
ret = -EFAULT;
break;