ethtool: __ethtool_set_sg: check for function pointer before using it
__ethtool_set_sg does not check if dev->ethtool_ops->set_sg is defined
which can result in a NULL pointer dereference when ethtool is used to
change SG settings for drivers without SG support.
Signed-off-by: Roger Luethi <rl@hellgate.ch>
Reviewed-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index c1a71bb..a1086fb 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -1457,6 +1457,9 @@
{
int err;
+ if (!dev->ethtool_ops->set_sg)
+ return -EOPNOTSUPP;
+
if (data && !(dev->features & NETIF_F_ALL_CSUM))
return -EINVAL;
