ethtool: do not vzalloc(0) on registers dump

[mirror_ubuntu-zesty-kernel.git] / net / core / ethtool.c

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 236a21e3c878e73fbd97d74de3694caaeab5e762..d92de0a1f0a49d51ec8329c65d46a4f2ae304ebd 100644 (file)
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -1405,9 +1405,12 @@ static int ethtool_get_regs(struct net_device *dev, char __user *useraddr)
        if (regs.len > reglen)
                regs.len = reglen;
 
-       regbuf = vzalloc(reglen);
-       if (reglen && !regbuf)
-               return -ENOMEM;
+       regbuf = NULL;
+       if (reglen) {
+               regbuf = vzalloc(reglen);
+               if (!regbuf)
+                       return -ENOMEM;
+       }
 
        ops->get_regs(dev, &regs, regbuf);